Air Quality Management Area 5 - Pollution in Greenstreet (A2)

POLLUTION DIARY

- TO VIEW PRE-COVID-19 DATA -
-- View Table for February 2019 to February 2020 --

  1. The Pollutants: I record four out of the five most toxic air pollutants associated with vehicles. I don't measure Ammonia (NH3).
  2. The Flow device: this measured as 90-95% accurate when compared with professional static monitors. Most of my data comes from one point close to the new Blind Company on Greenstreet/A2. The advantage of the Flow device is that it can measure "on the move". This allows me to create maps in real time in different stretches of road/lane around Greenstreet and show how pollution spreads a long way into our communities.
  3. Air Quality Indicators: These are based on EU, USA, and WHO thresholds for harmful pollutants over 1 hour, 24 hours, and a year.
  4. There are no known "safe levels" of PM2.5. This very fine form of pollution has many impacts, depending on the mix and size of particles (soot, soot binding to toxins, minerals, metals, organic compounds, and ozone)
  5. You will notice that pollution episodes can spread overnight.

AIR QUALITY INDICATOR (AQI) USED ON THIS SITE

Air Quality Indicator
(Bear in mind, there are no known lower safety levels for PM2.5)

 

Daily Changes in Pollution Levels
  Toxic Pollution Levels   Exceedances (time and duration)  
Date PM2.5 PM10 NO2 VOCs Daily
Average
High
(24 hours or more)
Very High +
(1 hour or more)
Graphs, Maps and Comments
2021
9th June 11 12 1 18 LOW   EXCEEDANCE During a flat day - VERY HIGH plateau just makes an exceedance between 1738-1838 - both PM2.5 and PM10 involved. Very flat otherwise.
10th June 6 11 2 16 LOW     Flat except for pronounced series of HIGH peaks 1130am to 1320pm.
11th June 4 10 0 15 LOW     MODERATE peaks from 0500 ended with a VERY HIGH peak of PM10 (PM2.5 just a bit lower) 0845am
12th June 4 13 4 11 LOW     A good day except for pronounced (up to VERY HIGH) between 1230 to 1600pm of PM10.
13th June 4 13 0 14 LOW     Flat except 0200am and again 1600-1700 series.
14th June 4 11 2 14 LOW     Calm day until 2300 to midnight sharp peaks of PM10.
15th June 4 11 5 10 LOW     LOW jagged line with one High Peak at 0720am.
16th June 4 16 0 18 LOW     LOW with VERY HIGH peak at 0730am and 1230pm, lesser peaks in between.

Comments: Over recent weeks, the daily averages have often read "LOW" but that hides some serious pollution that is dangerous to health over shorter periods/peaks. This makes the case for continuous monitoring rather than the inadequate policy of Swale Borough Council who rely on ANNUAL averages of only Nitrogen Dioxide in Greenstreet. That is why they can suggest rescinding the AQMA5 status. Although they are also trying to persuade us that pollution is SO BAD that we need a bypass! Make up your minds SBC!

NOTE: The static measurements that I have been making are taken along the A2 but West of the AQMA5.
Bear in mind that the measurements made by SBC have only relatively recently been relevant once they responded to Lynsted with Kingsdown Parish Council's criticism that SBC 'diffusion tubes' were sited unrealistically high above the heads of pedestrians.
SBC also fails to test for the more harmful PM2.5, PM10, and VOCs.
The appearance is that SBC would rather NOT know how much physical harm their decisions on planning have on our DAILY lives!


 

Daily Changes in Pollution Levels
  Toxic Pollution Levels   Exceedances (time and duration)  
Date PM2.5 PM10 NO2 VOCs Daily
Average
High
(24 hours or more)
Very High +
(1 hour or more)
Graphs, Maps and Comments
2020
1st January 44 35 11 10 MODERATE     1st January 2020 New Years  DayPM2.5 accounts for the shape and peaks/troughs of the whole graph.
2nd January 20 27 21 17 MODERATE     2nd January 2020Elevated levels across all four pollution fractions. NOx dominated between 7am-2pm; the sharp "High" peak at 6am was PM10 and PM2.5. The A2 drain-works did not materialise on this 'due date.' Rapid cycles in traffic impacted by flow through Bapchild - the worst of which may halt when Greenstreet roadworks come on stream.
3rd January 14 30 5 16 MODERATE     3rd January 2020Evenly spread polution levels - PM10 dominated.
4th January 11 26 3 13 MODERATE     4th January 2020PM10 dominated again.
5th January 13 27 1 12 MODERATE     5th January 2020 Pollution DiaryRapid peaks and troughs of PM10; also of PM2.5.
6th January 14 28 6 13 MODERATE     6th January 2020Rapid peaks and troughs of PM10; also of PM2.5.
LONDON ROAD (A2) - GREENSTREET - DRAIN RENEWAL (traffic pulsing through)
--- Avoidance Tactics in Evidence but Local Construction Traffic Heavier ---
7th January 16 38 2 14 MODERATE     7th January 2020 Pollution Diary AQMA5Rapid peaks and troughs in PM10 (and PM2.5)
8th January 15 31 1 16 MODERATE     8th January 2020 AQMA5Rapid peaks and troughs with parallel tracking of PM2.5 and PM10.
9th January 11 26 0 14 MODERATE     9th January 2020 Pollution DiaryPulses of PM10 dominating the measures of overall pollution. Reports of traffic in byways/'rat runs' starting to have an impact locally.
10th January 14 23 4 7 MODERATE     10th January 2020 Pollution AQMA5PM10 dominates until PM2.5 increases to equal levels from 4pm into the night. Pulses of traffic governed by new traffic lights at Station Road.
11th January 14 29 1 11 MODERATE     11th January 2020 AQMA5 PollutionPM10 dominates, PM2.5 parallel at lower levels. Pulses of traffic.
12th January 12 28 2 13 MODERATE     12th January 2020 Pollution Diary AQMA5PM10 dominates, PM2.5 tracks the same pattern. Graph highlights PM2.5. Single peak at midday - HIGH.
13th January 14 34 1 11 MODERATE     13th January 2020 Pollution DiaryPM10 dominates, PM2.5 tracks the same pattern. Graph highlights PM2.5. Pollution HIGH between 4am-9am - multiple peaks. PM10 is parallel to PM2.5.
14th January 15 37 1 14 MODERATE     14th January 2020 Pollution DiaryRapid pulses dominated by PM10, mirrored by PM2.5. HIGH from 7.45am to 10am.
15th January 13 30 2 12 MODERATE     15th January 2020 Pollution AQMA5Pulsing throughout, growing to HIGH in late evening.
16th January 14 29 1 11 MODERATE     16th January 2020 Pollution Diary AQMA5Pulsing dominated by PM10; PM2.5 in parallel peaks and troughs.
17th January 11 25 2 12 MODERATE     17th January 2020 Pollution DiaryPulsing throughout of both PMs. HIGH peak at 6pm.
18th January 17 30 5 5 MODERATE     18th January 2020 Pollution DiaryPulsing throughout of both PMs.
19th January 29 32 11 4 MODERATE     19th January 2020 Pollution AQMA5PM10 and PM2.5 pulsing alongside eachother throughout.
20th January 38 28 14 5 MODERATE     20th January 2020 pollution aqma5PM2.5 dominates all peaks (PM10 higher between 1pm-6pm.
21st January 37 29 18 5 MODERATE     21st January 2020 pollution diary aqma5PM2.5 dominates all peaks (PM10 higher between 1pm-6pm.
22nd January 46 57 29 10 HIGH EXCEEDANCEVery High Pollution Jogging   22nd January 2020 High Pollution ExceedanceBoth PM2.5 and PM10 were high into the evening in multiple peaks. NOx was also higher than usual. Overall, a bad day for breathing!
23rd January 37 48 3 13 MODERATE     23rd January 2020 marginally highOnly just under "HIGH" for PM10 in particular overnight into early morning.
24th January 26 24 2 13 MODERATE     24th January 2020 Pollution DiaryUsual 'saw-toothed' profile. This reflects the continuation of traffic-lights on the A2.
25th January 40 45 1 11 MODERATE     25th January 2020 Pollution DiaryThroughout the day there were serious peaks in Particulate Matter into the evening again.
26th January 22 32 4 16 MODERATE     26th January 2020 Pollution Diary AQMA5PM10 provides the peaks around midday. Unhealthy levels of PM2.5.
27th January 17 38 1 15 MODERATE     27th January 2020 Pollution DiaryPM2.5 peaked in the evening after 8pm.
28th January 12 29 1 12 MODERATE     28th January 2020 Polution Diary AQMA5 on A2PM10 dominated with a marked peak in the early evening.
29th January 12 30 9 11 MODERATE     29th January 2020 Pollution DIary AQMA5 A2PM10 dominated against. Interestingly NOx was fairly high in the afternoon.
30th January 13 28 6 14 MODERATE     30th January 2020 Pollution Diary AQMA5 A2PM10 dominated again.
31st January 7 21 1 16 MODERATE     31st January 2020 Pollution Diary AQMA5 A2Very nearly a good day. Low pressure descended and wind direction changed.
FEBRUARY 2020
1st February 14 33 0 14 MODERATE     1st February 2020 pollution diaryPM2.5 shadowed PM10, including the evening peak
2nd February 17 39 3 14 MODERATE     2nd February 2020 Pollution DiaryPM2.5 shadowed PM10.
3rd February 15 34 3 11 MODERATE     3rd February 2020 Pollution DiaryPM2.5 shadowed PM10.
4th February 13 31 2 7 MODERATE     4th February 2020 Pollution DiaryPM2.5 shadowed PM10.
5th February 20 37 2 7 MODERATE     5th February 2020 Pollution DiaryPM2.5 shadowed PM10.
6th February 31 33 19 6 MODERATE     6th February Pollution DiaryRun at midday was very worrying! 54/90/37/3 figures meaning BOTH PM fractions were "High" and "Very High" Pollution. NOx was higher throughout the afternoon and evening.
7th February 37 29 12 7 MODERATE     7th February 2020 pollution DiaryPM2.5 was EQUAL to PM10 until midday but shadowed PM10 therafter.
8th February 18 29 4 17 MODERATE     8th February 2020 Pollution diaryRun at 11am showing spread of pollutants. PM2.5 shadowed PM10 at spot station..
9th February 17 33 0 17 MODERATE     9th February 2020 Pollution DiaryPM2.5 shaddowed PM10.
10th February 12 28 1 13 MODERATE     10th February 2020 PollutionLight Rain (10.1mm). Wind 41-37km/h (gusts to 66km/h) - WSW-W
11th February 14 30 2 11 MODERATE     11th February 2020 Pollution DiaryPartly cloudy (0.6mm). Wind 36km/h (gusts to 62km/h) - Westerly. Jogging Map.
12th February 16 29 1 10 MODERATE     12th February 2020 Pollution Diary12/2: Overcast. Wind 30-15km/h (gusts to 50km/h) - WSW-W-SW. PM10 dominant.
13th February 14 28 2 12 MODERATE     13th February 2020 Pollution DiaryModerate Rain (21.30mm). Wind 19-51-19km/h (gusts to 77km/h) - S-SW-WNW. PM2.5 peak after midnight.
14th February 20 38 5 12 MODERATE     14th February 2020 Pollution DiaryOvercast. Wind 17-28km/h (gusts to 30-49km/h) - WNW-SSW. Run via Lower Lane HIGH Pollution. Most polluted throughout afternoon. PM2.5 & PM10 mirrored throughout. Jogging map.
15th February 14 29 0 18 MODERATE     15th February 2020 Pollution Diary.Light Rain (2.80mm). Wind 26-60km/h (gusts to 45-98km/h) - SSW-SW
16th February 10 24 0 16 MODERATE     16th February 2020 Pollution DiaryHeavy Rain (32.60mm). Wind 48-62-33km/h (gusts 81-103-59km/h) - South Westerly. PM2.5 & PM10 mirrored throughout.
17th February 17 37 1 12 MODERATE   EXCEEDANCE
17.50-18.55
.Very High Pollution Jogging
17th February 2020 Pollution DiaryLight Showers (0.80mm). Wind 29-39-30km/h (gusts 53-60-48km/h) - SW-WSW. The exceedance was of PM10 (PM2.5 peak too).
18th Fabruary 12 26 1 11 MODERATE     18th February 2020 Pollution DiaryLight Drizzle (1.10mm). Wind 29-34-28km/h (gusts to 46-50-43km/h) - WSW. PM10 dominating; PM2.5 mirroring.
19th February 15 31 2 10 MODERATE     19th February 2020 Pollution DiaryLight Drizzle (1.5mm). Wind 24-27km/h (gusts to 42-45km/h) - WNW-SW. Run on Lynsted Lane and Cellar Hill - Moderately higher pollution South of A2. Jogging Map.
20th February 12 28 1 12 MODERATE     20th February 2020 Pollution MapModerate Rain at Times (5.60mm). Wind 27-51-23km/h (gusts to 47-69-41km/h) - SW-W.
21st February 15 34 1 11 MODERATE     21st February 2020 Pollution DiaryOvercast. Wind 23-42km/h (gusts 43-68km/h) - W-SW. Pulsing traffic as usual ALL DAY (as usual).
22nd February 14 32 0 13 MODERATE     22nd February 2020 Pollution DiaryPatchy Rain Possible (0.30mm). Wind 41-28km/h (gusts to 67-75-47km/h) - SW-W-WSW.
23rd February 11 25 2 12 MODERATE     23rd February 2020 Pollution DiaryLight Drizzle (4.20mm). Wind 24-50-10km/h (gusts 41-89-16km/h) - WSW-W-NW. HIGHER pollution early morning.
24th February 13 25 1 12 MODERATE     24th February 2020 Pollution DiaryLight Rain (6.10mm). Wind 7-47-30km/h (gusts 11-71-49km/h) - S-SW-W. 6pm peak significant PM2.5 and PM10.
25th February 12 23 3 11 MODERATE     25th February 2020 Pollution DiaryLight Sleet Showers (1.90mm). Wind 23-32 (gusts 39-50km/h) - W-WSW-W. The 6pm peak was dominated by PM2.5.
26th February 13 28 4 6 MODERATE     26th February 2020 Pollution DiaryPatchy Rain Possible (0.50mm). Wind 32-18 (gusts 48-31km/h) - W-WNW-WSW. PM2.5 highest between 6pm and 9pm.
27th February 15 25 1 5 MODERATE     27th February 2020 Pollution DiaryHeavy Snow/Rain (14.40mm). Wind 17-33-18 (gusts 28-44-36km/h) - WSW-S-NNW-WNW. PM2.5 highest early morning and late evening.
28th February 18 29 14 11 MODERATE     28th February 2020 Pollution DiaryModerate Rain (12.20mm). Wind 16-43-37km/h (gusts 31-63-62km/h) - W-S-SW. Midday to 4pm peak is NOx.
29th February 17 42 10 17 MODERATE     29th February 2020 Pollution DiaryModerate Rain (11.10mm). Wind 40-47-36km/h (gusts 64-73-58km/h) - SSW-WSW-SW. PM10 dominant.
MARCH 2020
1st March 14 30 5 12 MODERATE     1st March 2020 Pollution DiaryLight Rain Showers (0.20mm). Wind 35-30-18km/h (gusts 57-36-32km/h) - SW-WSW-SW. PM2.5 Peak 9pm-11pm
2nd March 15 30 5 9 MODERATE     2nd March 2020 Pollution DiaryPatchy Rain (1.90mm). Wind 17-24-20km/h (gusts 28-35km/h) - S-NNW-W.
3rd March 14 32 12 10 MODERATE     3rd March 2020 Pollution DiaryLight Drizzle (0.70mm). Wind 19-22-14km/h (gusts 35-30-26km/h) - WSW-W. NOx peaks midday to 5pm! Run around Teynham Moderate and High patches.
4th March 20 29 22 10 MODERATE     4th March 2020 Pollution MapLight Rain Shower (3.50mm). Wind 15-8-17km/h (gusts 28-13-27km/h) - W-SSW-ESE. PM2.5 Peaks at 6am, midday and 4-6pm!
5th March 18 29 2 11 MODERATE     5th March 2020 Pollution MapHeavy Rain (26.70mm). Wind 7-39km/h (gusts 11-55km/h) - E-NE-N.
6th March 19 29 14 14 MODERATE     6th March 2020 Pollution MapPartly Cloudy (1.60mm). Wind 30-18-6km/h (gusts 42-22-12km/h) - NNW-NW-WNW.
7th March 5 25 4 10 MODERATE   Near exceedance 7th March 2020 Pollution DiaryPatchy Rain Possible (0.10mm). Wind 10-27km/h (gusts 18-49km/h) - WSW-SW.. VOCs increased during the day but PM10 massively peaked to near exceedance from 17.40-18.40pm.
8th March 4 14 6 25 MODERATE     8th March 2020 Pollution DiaryLight Rain Shower (2.90mm). Wind 35-30-20km/h (gusts 58-44-35km/h) - SSW-SW-WSW. Unusually dominated by VOCs without peaks; Peaks are PM10.
9th March 4 15 2 20 MODERATE     9th March 2020 Pollution DiaryPatchy Rain Possible (2.40mm). Wind 22-26-38km/h (gusts 37-36-62km/h) - WSW-W-SSW. Unusually dominated by VOCs without peaks; Peaks are PM10.
10th March 5 13 6 21 MODERATE     10th March 2020 Pollution DiaryLight Drizzle (8.40mm). Wind 37-27-36km/h (gusts 62-46-64km/h) - SW-WSW. Unusually dominated by VOCs without peaks; The peak was PM10 (VERY HIGH 18.45-19.00). Running along Lower Road 54 vehicles passed - before roadworks the figure was 5 or 6 vehicles in the same off-peak periods.
11th March 4 10 4 18 LOWLow Pollution - result!     11th March 2020 Pollution DiaryLight Rain Showers (3.50mm). Wind 38-30-36km/h (gusts 62-42-56km/h) - SW-WSW.
12th March 5 17 1 14 LOWLow Pollution - result!     12th March 2020 Pollution DiaryPatchy Rain Possible (2.00mm). Wind 34km/h (gusts 61-57km/h) - WSW. Running along Lower Road 63 vehicles passed - before roadworks the figure was 5 or 6 vehicles in the same off-peak periods.
13th March 5 24 8 11 MODERATE     13th March 2020 Pollution DiaryLight Rain Shower (0.60mm). Wind 39-13km/h (62-25km/h) - WSW - SW.
14th March 16 27 0 15 MODERATE     14th March 2020 Pollution DiaryLight Rain Shower (6.80mm). Wind 9-23km/h (gusts 16-39km/h) - SSW-SW..Graph shows how PM2.5 often shadows PM10 throughout the day.
15th March 13 26 1 15 MODERATE     15th March 2020 Pollution DiaryLight Rain Shower (1.40mm). Wind 24-33-3km/h (gusts 42-48-4km/h) - SW-SSW-ENE. Jogging Map.
16th March 17 26 3 10 MODERATE     16th March 2020 Pollution DiaryPartly Cloudy (1.20mm). Wind 4-11km/h (gusts 6-21km/h) - NW-WSW.
17th March 19 30 1 15 MODERATE     17th March 2020 Pollution DiaryOvercast (dry). Wind 11-22km/h (gusts 22-39km/h) - WSW-SW. Jogging Map
18th March 16 24 2 16 MODERATE     18th March 2020 Pollution DiaryOvercast (dry). Wind 23-13km/h (gusts 42-25km/h) - SW.
19th March 17 19 2 9 LOWLow Pollution - result!     19th March 2020 Pollution DiaryLow pollution is encouraging for walkers and runners getting in their daily exercise.
20th March 18 39 1 8 MODERATE     20th March 2020 Pollution Diary
21st March 17 32 4 6 MODERATE     21st March 2020 Pollution Diary
22nd March 18 28 20 7 MODERATE     22nd March 2020 Pollution DiarySunday. NOx has started to feature as a 'bulge' that shifts day-to-day - I am assuming that this reflects the periods when all the lorries trying to get through the traffic lights. But PM10 still dominates throughout the day..
23rd March 26 31 26 8 MODERATE     23rd March 2020 Pollution DiaryNOx afternoon bulge when traffic is slow to get through the traffic lights.
24th March 25 24 24 12 MODERATE     24th March 2020 Pollution DiaryNOx bulge throughout the daylight hours.
25th March 27 24 17 10 MODERATE     25th March 2020 Pollution DiaryNOx bulge 8am-2pm. PM2.5 dominated though!
26th March 38 32 18 11 MODERATE     26th March 2020 Pollution DiaryBad day. NOx bulge all day in 'normal' working hours.
27th March 38 38 18 15 MODERATE     27th March 2020 Pollution DiaryBad day. NOx bulge during working hours.
28th March 25 41 3 13 MODERATE     28th March 2020 Pollution DiarySaturday and no NOx bulge! PM2.5 has been higher for a week now.
29th March 18 42 13 8 MODERATE     29th March 2020 Pollution DiarySunday NOx bulge from midday to 9pm. Curious.
30th March 15 31 9 11 MODERATE     30th March 2020 Pollution DiaryMidday peak for NOx returns!
31st March 15 31 10 13 MODERATE     31st March 2020 Pollution DiaryWith multiple peaks spread across the day may suggest a change in traffic as Docwra take down their barriers ready to move them down towards the West end of Greenstreet.
APRIL 2020
1st April 18 24 16 13 MODERATE     1st April 2020 Pollution DiaryNOx 'bulge' continues to feature.
2nd April 14 23 0 21 MODERATE     2nd April 2020 Pollution DiaryVOC 'bulge'.
3rd April 21 42 2 19 MODERATE     3rd April 2020 Pollution DiaryNotice how PM2.5 and PM10 mirror each other.
4th April 23 28 2 18 MODERATE     4th April 2020 Pollution DiaryPM2.5 and PM10 ran 'neck and neck' but there were no sustained bulges or peaks. A confirmation that people stayed at home on this sunny Saturday.
5th April 17 22 4 19 MODERATE     5th April 2020 Pollution DiaryMinor peaks at usual travel times.
6th April 12 23 2 22 MODERATE     6th April 2020 Pollution DiaryCurious peaks. We did seem to have more blockages than usual with the lower levels of traffic?
7th April 20 37 4 13 MODERATE     7th April 2020 Pollution DiaryThe workmen repairing the water main were outside our home on 7th and 8th. So the higher figures may have been influenced. Although that doesn't account for 'out of hours' peaks. So, not the whole story!
8th April 42 41 1 13 MODERATE     8th April 2020 Pollution DiaryAs above.
9th April 50 52 2 13 HIGH EXCEEDANCE EXCEEDANCE
07.33 - 08.47
.Very High Pollution Jogging
9th April 2020 Pollution DiaryTHIS LOOKS TERRIBLE! BUT ... the VERY HIGH peak occurred when the workmen were using machinery within two metres of the monitor - so, all I can say is that only we were experiencing harm! The afternoon quietened down after the workmen finished and closed their operations down for Easter.
10th April 33 36 1 12 MODERATE     10th April 2020 Pollution DiaryStill not good, but better than when workmen and their generators are not next to you! High pressure systems also may be trapping particles near ground level to add to our woes. Similar overall shape of the graph = quieter afternoon.
11th April 18 24 1 14 MODERATE     11th April 2020 Pollution DiaryApart from the late-morning peak, the pollution has been pretty tame again. The A2 has been quieter. PM2.5 was a bit worrying (coloured line).
12th April 17 21 2 17 MODERATE     12th April 2020 Pollution DiaryThere was a modest increase in traffic at around 9pm that pushed this graph into MODERATE rather than LOW.
13th April 17 40 6 6 MODERATE     13th April 2020 Easter breakPM10 dominated. This level of pollution is worrying but not sure why?? The morning was worse than the rest of the day - deliveries getting ready for Tuesday perhaps?
14th April 15 28 1 5 MODERATE     14th April 2020 Pollution DiaryPM2.5 peaked after 8pm but otherwise this graph shows PM10 as the dominant particulate size.
15th April 27 37 28 8 MODERATE     15th April 2020 Pollution DiaryThe 'block' of peaks throughout the day-time was dominated by NOx - picked out in th graph. Basically a toxic mix of all PMs and NOx. Background pollution for Swale was estimated as AQI 40 - our peak was in PM10 but also worrying levels of PM2.5 and NOx! Not a good day for walking!
16th April 42 41 3 13 MODERATE     16th April 2020 Pollution DiaryEven without this evidence, my impression has been that more traffic has passed us this day - more cars. PM2.5 and PM10 tracked each other throughout the day. Background pollution for Swale was estimated as AQI 37 - so our higher roadside pollution is definitively traffic-related.
17th April 19 42 1 13 MODERATE     17th April 2020 Pollution DiaryI confess I thought traffic was heavier during our daily walk again. Quite what, if anything, this means is open to conjecture. Background pollution for Swale was estimated as AQI 39 - so our higher roadside pollution is definitively traffic-related.
18th April 21 50 2 13 HIGH EXCEEDANCEVery High Pollution Jogging   18th April 2020 Pollution DiaryA score of "50" (PM10) is technically an exceedance but it is at the margin. Nevertheless, pollution was significant throughout the day - enough to be toxic over 24-hours. Background pollution for Swale was estimated as AQI 36 - so our higher roadside pollution is definitively traffic-related.
19th April 18 43 1 12 MODERATE     19th April 2020 Pollution DiaryPM10 figures continue to dominate with PM2.5 continuing at a troubling level..
20th April 18 47 1 12 MODERATE     20th April 2020 Pollution DiaryVery much dominated by PM10. PM2.5 was mirroring the graph line but significantly lower. However there was a bulge in the evening - not sure why? Also at lunchtime?
21st April 18 42 0 12 MODERATE     21st April 2020 Pollution DiaryVery much dominated by PM10. PM2.5 was mirroring the graph line but significantly lower. The 'ripple' all day reflects the traffic lights regulating the flow.
22nd April 21 33 1 12 MODERATE     22nd April 2020 Pollution DiaryVery much dominated by PM10. PM2.5 was mirroring the graph line but significantly lower.
23rd April 26 29 1 13 MODERATE     23rd April 2020 Pollution DiaryAs above but also note that the normal peaks and troughs when there is no Covid-19 are not evident - this does suggest that most people are still staying at home.
24th April 23 27 2 12 MODERATE     24th April 2020 Pollution DiaryAs above but note how pollution declined all day. The higher overnight/morning figures were shared equally between PM2.5 and PM10.
25th April 15 31 1 10 MODERATE     Saturday. PM10 Strongly dominant. Bulge in traffic throughout the morning, lower in pm.
26th April 14 22 1 12 MODERATE     26th April 2020 Pollution DiarySunday. Bulge through the middle of the day (9am-2pm)
27th April 18 21 2 15 LOW/ MODERATE     27th April PollutionA fraction short of GOOD. VOC high throughout daylight hours.
28th April 14 29 1 12 MODERATE     28th April 2020 PollutionPM10 Strongly dominant.
29th April 12 26 0 19 MODERATE     29th April 2020 PollutionPM10 Strongly dominant. PM2.5 peaks 11am and 11pm!
30th April 10 25 1 17 MODERATE     30th April 2020 PollutionPM10 Dominant; PM2.5 tracking same pattern.
MAY 2020
1st May 10 23 2 14 MODERATE     1st May 2020 PollutionPM10 Dominant; PM2.5 tracking same pattern.
2nd May 8 21 1 13 LOW/ MODERATE     2nd May 2020 PollutionSaturday. A fraction short of GOOD. VOC high throughout daylight hours.
3rd May 9 21 1 12 LOW/ MODERATE     3rd May 2020 PollutionSunday. A fraction short of GOOD. VOC high throughout daylight hours.
4th May 11 23 3 11 MODERATE     4th May 2020 PollutionUsual 'sawtooth' throught the day.
5th May 11 28 1 9 MODERATE     5th May 2020 PollutionUsual 'sawtooth' throught the day.
6th May 15 30 1 11 MODERATE     6th May 2020 PollutionSome sharp spikes at the "high" end of pollution levels.
7th May 14 24 1 18 MODERATE     7th May 2020 PollutionPollution (PM10) upward-itrend in afternoon/evening.
8th May 16 25 2 16 MODERATE     8th May 2020 PollutionSignficant traffic pollution from 7pm to 11pm.
9th May 29 36 3 14 MODERATE     9th May 2020 PollutionSaturday: Higher pollution from midday to 7pm; notably PM2.5 levels remained higher throughout the day
10th May 22 27 2 11 MODERATE     10th May 2020 Pollution levelsSunday. Notable peaks all afternoon. drivers going home?.
11th May 12 32 3 5 MODERATE     11th May 2020 Pollution
12th May 12 29 3 12 MODERATE     12th May 2020 Pollution
13th May 11 26 3 9 MODERATE     13th May 2020 Pollution
14th May 10 25 10 8 MODERATE     14th May 2020 Pollution
15th May 10 23 2 13 MODERATE     15th May 2020 Pollution
16th May 11 21 1 15 LOW/ MODERATE     16th May 2020 PollutionSaturday.
17th May 11 24 0 22 MODERATE     17th May 2020 PollutionSunday. The midday spike was VOC!
18th May 12 23 0 20 MODERATE     18th May 2020 PollutionPM10 throughout, including early evening spikes.
19th May 10 21 1 21 LOW/ MODERATE     19th May 2020 PollutionPM10 and PM2.5 mirrored eachother.
20th May 8 18 2 19 LOWLow Pollution - result!     20th May 2020 |PollutionLOW Pollution coincides with roadworks/pavement cutting moves west of our sensors.
21st May 10 19 1 17 LOWLow Pollution - result!     21st May 2020 PollutionLOW Pollution coincides with roadworks/pavement cutting moves west of our sensors.

From 22nd May I will be using the latest Flow Device (FLOW 2), with which I have been shadowing the FLOW 1 sensor for several weeks and they are 'in step' with each other. The sensitivity/accuracy of the FLOW 2 has the same profile as the FLOW 1.

22nd May 5 25 3 16 MODERATE     22nd May 2020 Pollution DiaryThe spikey evening is principally PM10
23rd May 7 44 3 8 MODERATE     23rd May 2020 Pollution DiarySaturday: Spikes of PM10 briefly exceeded the "VERY HIGH" level. But the average is 44.
24th May 7 34 23 8 MODERATE     24th May 2020 Pollution DiarySunday: It is worrying to see elevated levels of NOx from 8am. People out and about?
25th May 5 23 16 8 MODERATE     25th May 2020 Pollution DiaryDampened down particulates. Still a worrying mix.
26th May 5 19 15 10 LOWLow Pollution - result!     26th May 2020 Pollution DiaryThe measurement is right 'on the line', but is nearer to "safe" for us - just outside the AQMA5 zone.
27th May 4 15 8 8 LOWLow Pollution - result!     27th May 2020 Pollution DiaryMuch more emphatically a GOOD DAY!
28th May 6 35 8 4 MODERATE     28th May 2020 Pollution DiaryRoadworks in full swing and heavy traffic congested. Two 'humps' of PM2 - 8am-10am and 8pm-9pm are buried below this graph line.
29th May 6 38 7 7 MODERATE     29th May 2020 Pollution DiaryThe traffic was bad throughout the working day, which explains the profile. A mixture of more cars than usual and the traffic lights.
30th May 5 25 13 12 MODERATE   EXCEEDANCE
01.10 - 02.20
.Very High Pollution Jogging
30th May 2020 Pollution DiarySaturday: The daily average was 25; but from 1.20am-2.20am there was an EXCEEDANCE at levels that are harmful if breathed for more than one hour! The two 'humps' in the middle of the day and evening are 'new normal'.
31st May 4 15 14 14 LOWLow Pollution - result!     Sunday: What a difference a day makes! This proves just how useless SBC diffusion tubes are - they average our over days and weeks, when the good and the bad happen in hours and days.
JUNE 2020
1st June 4 15 11 13 LOWLow Pollution - result!     1st |June 2020 Pollution DiaryAnother good day. BUT ... the Traffic Lights and workmen moved West. It will be interesting to see if there is an effect?
2nd June 4 16 23 14 LOWLow Pollution - result!     2nd June 2020 Pollution Diary I spoke too soon! NOx reared its ugly head again through the normal working day. The 03.00am spike was PM10.
3rd June 4 11 11 13 LOWLow Pollution - result!     3rd June 2020 Pollution DiaryNo wonder that my jog along the Lower Road was easier! Well, relatively easier. The pollutants PM10, NOx and VOCs were roughly eaual all day.
4th June 4 11 6 10 LOWLow Pollution - result!     4th June 2020 Pollution DiaryAnother good day! There was an afternoon 'hump' of NOx.
5th June 4 12 7 15 LOWLow Pollution - result!     5th June 2020 Pollutio DiaryThe midday spike was midday when the traffic came to something of a halt. It is interesting how suddenly that effect kicks in.
6th June 5 16 4 15 LOWLow Pollution - result!     6th June 2020 Pollution DiarySaturday: All the spikes were PM10, with a massive (short) spike just after midnight? I can only speculate someone idling outside our house?
7th June 4 9 0 10 DUFF DATA     7th June 2020 Pollution DiaryIncomplete data. The sensor ran out of battery power.
8th June 5 21 5 13 MODERATE     8th June 2020 Pollution DiaryOn the margin with Low. But, you will notice the massive peaks in PM10 from 3.30 to 6.30am. I assume there were problems on the M2?
9th June 4 14 14 13 LOWLow Pollution - result!     9th June 2020 Pollution DiaryNOx built up during the day but not more than MODERATE. The spikes are PM10.
10th June 4 18 5 14 LOWLow Pollution - result!     10th June 2020 Pollution DiarySpikes went HIGH for PM10. But daily average is nicely LOW.
11th June 5 22 2 12 MODERATE     11th June 2020 Pollution DiaryDominated by spikes of PM10 that you would expect with traffic lights - nothing new.
12th June 4 18 9 14 LOWLow Pollution - result!     12th June 2020 Pollution DiaryDominated by spikes of PM10 that you would expect with traffic lights - nothing new.
13th June 4 14 13 16 LOWLow Pollution - result!     13th June 2020 Pollution DiarySaturday: VERY unusual shape to the PM10 pollution. 3am spike was there, 7.30 peak as traffic got stuck ... and then nothing much at all! It was unexpectedly quiet. Great!
14th June 4 11 9 17 LOWLow Pollution - result!     14th June 2020 Pollutio DiarySunday: Curiously, VOC's comprise the 'bulk' of pollution - peaks are PM10. Easing 'lock down' seems to coincide with people avoiding driving this weekend?
15th June 4 12 9 16 LOWLow Pollution - result!     15th June 2020 Pollution DiaryPeaks and troughs can be seen as traffic-lights at work. VOCs dominate
16th June 4 10 8 16 LOWLow Pollution - result!     16th June 2020 Pollution DiaryPeaks and troughs can be seen as traffic-lights at work.VOCs dominate
17th June 4 10 7 13 LOWLow Pollution - result!     17th June 2020 Pollution DiaryPeaks and troughs can be seen as traffic-lights at work.VOCs dominate
18th June 4 12 1 13 LOWLow Pollution - result!     18th June 2020 Pollution DiaryPeaks and troughs can be seen as traffic-lights at work.VOCs dominate
19th June 4 11 5 13 LOWLow Pollution - result!     19th June 2020 Pollution DiaryThe taller 'lump' is still VOCs.
20th June 4 12 9 14 LOWLow Pollution - result!     20th June 2020 Pollution DiarySaturday. The sharp peak is PM10. PM10 is the usual "swa-toothed" pattern that is resulting from traffic lights.
21st June 4 16 5 12 LOWLow Pollution - result!     21st June 2020 Pollution DiarySunday. The levels of pollution grew throughout the evening. THe road outside our house was very busy.
22nd June 5 20 6 13 MODERATE     22nd June 2020 Pollution DiaryRight on the cusp, so still quite low even if technically MODERATE. The real 'damage' was done through the morning peaks.
23rd June 5 20 6 13 MODERATE     23rd June 2020 Pollution DiaryAlmost exactly the same as yesterday in the pattern of the graph. We did have periods when the road was surprisingly busy at that time - traffic slow (and noisy - radios).
24th June 4 15 3 11 LOWLow Pollution - result!     24th June 2020 PollutionSignificantly in the "Low" zone! OK, we have to thank the roadworks for persuading drivers to find alternatives - except that we do see large waves very early in the morning around 3 a.m.
25th June 4 13 2 12 LOWLow Pollution - result!     25th June 2020 PollutionGood spread of Low pollution averaged over the day but much higher in the small hours with large lorries thundering through - until held up by lights and they just keep thrumming engines.
26th June 5 19 0 19 LOWLow Pollution - result!     26th June 2020 PollutionAt the cusp between Low/Moderate. Afternoon and evening traffic reached dangerous peaks of "Very High" several times..
27th June 4 15 1 12 LOWLow Pollution - result!     27th June 2020 pollutionAll good except from mid-afternoon to early evening peaks.
28th June 5 18 4 12 LOWLow Pollution - result!     28th June 2020 pollutionThe peaks are becoming familiar. Sadly, early mornings are here to stay as the A2 becomes a run through to our towns and Medway towns.
29th June 5 18 4 12 LOWLow Pollution - result!     29th June 2020Ditto.
30th June 4 16 1 13 LOWLow Pollution - result!     30th June 2020 pollutionAgain, the average for 24 hours is good, but midnight to midday was horrible.
JULY 2020
1st July 4 14 9 14 LOWLow Pollution - result!     1st July 2020 pollution graphGood. Less so in the middle of the day
2nd July 6 21 5 14 MODERATE     2nd July 2020 PollutionOK. I am fed up with disturbed nights and dangerous spikes in pollution as heavy goods vehicles career through in the early hours. Perhaps the M2 is being worked on?
3rd July 4 14 5 12 LOWLow Pollution - result!     3rd July 2020In contrast to yesterday - a very good day throughout! Who knew!?
4th July 4 13 3 12 LOWLow Pollution - result!     4th July 2020 pollutionSurprising peak at 10am. But otherwise excellent!
5th July 6 16 3 13 LOWLow Pollution - result!     5th July 2020 pollutionPeak at 6pm. Otherwise pretty excellent! Regional background pollution was low too.
6th July 6 27 12 10 MODERATE     6th July pollutionVery High extended peak towards midnight. PM10 with higher NOx measurement.
7th July 7 21 8 13 MODERATE     7th July 2020Early morning pollution peaks yet again. Not sure of M2 works in hand?
8th July 4 14 2 14 LOWLow Pollution - result!     8th July 2020 PollutionRegional pollution was low as well. Very early morning peak/midnight-1am..
9th July 4 14 4 12 LOWLow Pollution - result!     9th July 2020 pollutionPeaky.
10th July 4 15 3 8 LOWLow Pollution - result!     10th July 2020 pollutionAnother exmaple where the 24-hour measurement misses horribly high pollution peaks.
11th July 4 15 11 9 LOWLow Pollution - result!     11th July 2020 pollutionAnother good day with some high peaks.
12th July 5 17 15 11 LOWLow Pollution - result!     12th July 2020 PollutionAgain, once traffic builds up even modestly, a peak of surging pollution bites.
13th July 5 21 7 15 MODERATE     13th July 2020 pollutionSeveral High peaks throughout day and night.
14th July 5 17 2 12 LOWLow Pollution - result!     14th July 2020 pollutionDreadful middy peaks as traffic came to a grinding queue.
15th July 4 13 5 14 LOWLow Pollution - result!     15th July 2020 PollutionNo serious peaks although early morning is still very busy to 3am.
16th July 4 11 5 13 LOWLow Pollution - result!     16th July 2020 PollutionClean day - OK PM doesn't have a 'safe' lower limit.
17th July 5 15 5 16 LOWLow Pollution - result!     17th July 2020 PollutionToday's problems took place from 7pm to 8.30pm. Otherwise fine.
18th July 5 14 1 15 LOWLow Pollution - result!     18th July 2020 PollutionFairly calm low pollution.
19th July 4 12 1 10 LOWLow Pollution - result!     19th July 2020 pollutionA good day all round.
20th July 5 19 14 9 LOWLow Pollution - result!     20th July 2020 PollutionMarginal. Peaks at usual times. Overnight does appear to be following a pattern - including loss of sleep.
21st July 5 23 14 10 MODERATE     21st July 2020 PollutionSo much for sleep! Heavy pollution too - anyone sleeping with windows open gets this regularly fed to them.
22nd July 4 13 7 15 LOWLow Pollution - result!     22nd July 2020 PollutionPretty well OK. Low pollution.
23rd July 5 17 3 16 LOWLow Pollution - result!     23rd July 2020 PollutionThe 24-hour numbers look OK ... but take a look at the 9am spike! Agricultural movements.
24th July 4 13 2 15 LOWLow Pollution - result!     24th July 2020 PollutionA good day and night.
25th July 4 12 0 12 LOWLow Pollution - result!     25th July 2020 PollutionExcellent measurements. Lowish spikes.
26th July 4 15 7 10 LOWLow Pollution - result!     26th July 2020 PollutionApart from early morning lorry traffic, pollution was OK!
27th July 5 15 2 13 LOWLow Pollution - result!     27th July 2020 PollutionShort-lived peak of traffic congestion at 11am onwards.
28th July 4 14 8 12 LOWLow Pollution - result!     28th July 2020 PollutionPeaks at expected times.
29th July 4 16 8 12 LOWLow Pollution - result!     29th July 2020 PollutionHeavier than usua traffic under current roadworks conditions during middle of the day
30th July 6 21 5 14 MODERATE     30th July 2020 PollutionAverage for 24 hours was marginal but the heavy goods and others travelling through AQMA5 all night was appalling - regularly High Pollution.
31st July 4 11 2 33       31st July 2020 pollutionVOC strangely on the high side of Moderate.
AUGUST 2020
1st August 8 20 1 17       1st August 2020 - unstable power leadData Interruption p.m. Power Connection Lost
2nd August 0 0 8 16       Public Data - Background estimates for our area. No Flow data
3rd August 9 8 9 19       Public Data - Background estimates for our area. No Flow data
4th August 8 20 5 10       4th August 2020 with data interruptionData Interruption p.m.
5th August 5 18 4 12       5th August 2020 data lossSpikes of heavy pollution. Data Loss in p.m.
6th August 10 10 10 22       Public Data - Background estimates for our area. No Flow data
7th August 8 19 1 13 LOWLow Pollution - result!     7th August pollution - power lead changedNormal Service resumed! Peaks throughout the day reflects flow of traffic.
8th August 17 22 0 13 MODERATE     8th August 2020 pollutionMid afternoon saw prolonged congestion and heavy traffic levels.
9th August 5 28 0 11 MODERATE     9th August 2020 POllution levelsPollution levels rose markedly this day. Multiple peaks at 'regular' times
10th August 6 32 0 13 MODERATE     10th August 2020 pollution risingA dangerously high period between midday and 4pm. Traffic weight led to congestion building up suddenly. All morning slow traffic.
11th August 28 18 0 12 MODERATE     11th August 2020 pollution especially PM2-5PM2.5 is higher and more dangerous as there is no 'safe lower limit'. Light variable winds - NE - NNE
12th August 33 22 0 12 MODERATE     12th August 2020 Pollution high PM2-5PM2.5 is again dangerously high throughout the day. Light variable winds.
13th August 25 18 0 12 MODERATE     13th August 2020 pollution levelsThis run of fine PM2.5 pollution is worrying. Again, plenty of traffic throughout the day. Light variable winds.
14th August 4 7 3 11 LOWLow Pollution - result!     14th August 2020 reduced pollutionWind picked up and changed direction to WNW-NW. This may explain the sudden drop in pollution. Yet again - 3-4am early peaks.
15th August 23 29 0 12 MODERATE     15th August 2020 Pollution increasing againBoth types of Particulate Matter represented again.
16th August 5 16 0 11 LOWLow Pollution - result!     16th August 2020 pollution diarySunday morning people on the move, but congesting in AQMA5 in the morning only with occasional peaks later.
17th August 4 16 1 13 LOWLow Pollution - result!     17th August 2020 Pollution levels average lowAnother example of early morning heavy traffic passing through Greenstreet. Background pollution remains low. Peaks of PM10 at usual times.
18th August 5 15 1 13 LOWLow Pollution - result!     18th August 2020 Pollution Diary PM10 massive peak between 11-11.30am. Traffic almost at a standstill - took a while to free up.
19th August 9 21 1 12 MODERATE     19th August 2020 PollutionMost of the late morning into the afternoon we saw higher levels of traffic.
20th August 4 14 1 15 LOWLow Pollution - result!     20th August 2020 PollutionTraffic throughout the working day was 'pulsing' in peaks but early and late the pollution was Low. Average was "Low". Midday to 4pm was VOC peaks.
21st August 5 23 0 13 MODERATE     21st August 2020 PollutionUsual peaks, with highest early morning.
22nd August 11 27 1 12 MODERATE   EXCEEDANCE!
10.00 - 11.00
.Very High Pollution Jogging
22nd August 2020 exceedane of PM10A busy day on the road with a very heavy traffic-loading before midday - enough to register as an "exceedance" of safe pollution over one hour. You could taste it ... after so many relatively good days.
23rd August 4 15 6 11 LOWLow Pollution - result!     23rd August 2020 Pollution graphCurious spike of PM10 from 1045pm to just after 11pm? Otherwise, this was a very good day!
24th August 5 20 5 14 MODERATE     24th August 2020 Pollution DIaryPM10 dominating the peaks during the day.
25th August 5 24 1 12 MODERATE     25th August 2020 Pollution diaryEarly good day becoming progressively much worse.
26th August 5 21 4 12 MODERATE     26th August 2020 Pollution DiaryPollution much higher overnight for extended period.
27th August 5 21 3 11 MODERATE     27th August 2020 Pollution DiaryThe average "Moderate" is created by larger peaks over a reasonable period.
28th August 10 24 1 12 MODERATE     28th August 2020 Pollution DiaryLate morning extended peak of PM10.
29th August 10 26 1 9 MODERATE     29th August 2020 Pollution DiaryUncomfortable levels of PM2.5.
30th August 6 30 4 8 MODERATE   EXCEEDANCE!
06.27 - 07.40
.Very High Pollution Jogging
30th August 2020 Pollution Diary GraphPM10 Exceedance of dangerous "very high" pollution for more than an hour.
31st August 4 11 6 10 LOWLow Pollution - result!     31st August 2020 Pollution Diary GraphA good Monday to be out and about during daylight.
SEPTEMBER 2020
1st Sept 4 12 6 12 LOWLow Pollution - result!     1st September 2020 Pollution DiaryThese peaks are at very low levels of pollution, another very good day to be out and about.
2nd Sept 5 15 6 22 MODERATE     2nd September 2020 Pollution DiaryUnusually high levels of VOC between 1-2pm. Higher PM10 early morning and later (8pm). The roadworks have been cleared for a few days now, so levels may change up again? wait and see.
3rd Sept 4 13 7 20 MODERATE     3rd September 2020 Pollution Diary GraphFigures made "Moderate" by VOC levels, otherwise fairly Low.
4th Sept 4 17 4 17 LOWLow Pollution - result!     4th September 2020 Pollution Diary GraphAnother dip in pollution. Very welcome for jogging!
5th Sept 4 20 5 11 MODERATE     5th September 2020 Pollution DiarySaturday: another 'day of two halves!' Nasty morning but the afternoon was good. Borne out by a jog along the A2!
6th Sept 12 19 1 11 LOWLow Pollution - result!     Yet again - enough traffic peaking at around 3am! Most is HGV - does anyone know what ferries arrive early doors?
7th Sept 14 22 1 12 MODERATE     Avery prounounced peak at midday as the weight of traffic caused tail-backs.
8th Sept 11 14 0 16 LOWLow Pollution - result!     Even distribution across the day.
9th Sept 14 21 1 13 MODERATE     Another half-hour midday spike at "Very High".
10th Sept 15 29 4 9 MODERATE     Very worrying levels (High and Very High) from 4pm untill midnight with stop-start traffic all evening.
11th Sept 14 21 1 11 LOWLow Pollution - result!     Regular peaks throughout the day and night.
12th Sept 12 20 1 13 MODERATE     Massive peak (High and Very High) around 6pm.
13th Sept 12 19 1 13 LOWLow Pollution - result!     Regular peaks throughout the day and night.
14th Sept 15 19 1 11 LOWLow Pollution - result!     Regular peaks throughout the day and night.
15th Sept 28 25 0 13 MODERATE     Two major peaks of PM10; PM2.5 was at very worrying levels throughout the day.
16th Sept 24 28 1 12 MODERATE     The peaks were PM10; PM2.5 was more evenly spread at a worrying level.
17th Sept 14 28 2 10 MODERATE     PM10 was the main culprit throughout day and night.
18th Sept 13 24 0 10 MODERATE     Worrying peaks from midday to 6pm.
19th Sept 13 22 0 13 MODERATE     Regular peaks throughout the day and night.
20th Sept 15 23 0 12 MODERATE     Regular peaks throughout the day and night.
21st Sept 16 17 1 12 LOWLow Pollution - result!     Stable pollution levels - good news!
22nd Sept 16 16 0 15 LOWLow Pollution - result!     Stable pollution levels - good news! A couple of stand-out peaks but not too bad.
23rd Sept 14 20 0 15 MODERATE     From 7pm to midnight, the sharp peaks ruined an otherwise good day.
24th Sept 13 21 3 11 MODERATE     Worrying peaks due to congestion around midday and again around 6-7pm.
25th Sept 14 18 2 7 LOW     50% of Data lost - connection issues
26th Sept 23 20 0 12 MODERATE     Single high peak of both PM2.5 and PM10 at 3am in the morning.
27th Sept 0 0 5 20 MODERATE     BACKGROUND POLLUTION Estimated Swale
28th Sept 15 14 16 5 LOW     BACKGROUND POLLUTION Estimated Swale
29th Sept 0 1 11 15 LOW     BACKGROUND POLLUTION Estimated Swale
30th Sept 0 0 0 30 MODERATE     BACKGROUND POLLUTION Estimated Swale
OCTOBER 2020
1st Oct 0 0 2 31 MODERATE     BACKGROUND POLLUTION Estimated Swale
2nd Oct 0 0 5 24 MODERATE     BACKGROUND POLLUTION Estimated Swale
3rd Oct 0 0 2 35 MODERATE     BACKGROUND POLLUTION Estimated Swale
4th Oct 5 5 9 11 LOW     BACKGROUND POLLUTION Estimated Swale
5th Oct 0 0 3 25 MODERATE     BACKGROUND POLLUTION Estimated Swale
6th Oct 1 2 5 17 LOW     BACKGROUND POLLUTION Estimated Swale
7th Oct 0 0 2 30 MODERATE     BACKGROUND POLLUTION Estimated Swale
8th Oct 12 9 17 1 LOW     BACKGROUND POLLUTION Estimated Swale
9th Oct 0 0 12 10 LOW     BACKGROUND POLLUTION Estimated Swale
10th Oct 4 4 9 11 LOW     BACKGROUND POLLUTION Estimated Swale
11th Oct 0 0 11 8 LOW     BACKGROUND POLLUTION Estimated Swale
12th Oct 23 20 0 12 MODERATE     FLOW RETURNS! AQMA5 roadside
13th Oct 17 18 0 11 LOW     Pulses throughout the day (and night)
14th Oct 18 18 1 12 LOW     Pulses throughout the day (and night)
15th Oct 16 20 1 12 MODERATE     Pulses throughout the day (and night)
16th Oct 18 18 1 13 LOW     PM2.5 &PM10 Peak at 18.30.
17th Oct 19 15 0 13 LOW     Quieter early morning and mid afternoon (Saturday)
18th Oct 24 17 0 13 MODERATE     Heaviest pollution 1900-2000 hrs
19th Oct 25 22 0 15 MODERATE     Much heavier pulses of particulate pollution 1400-1800 hrs
20th Oct 20 26 0 18 MODERATE     Major peaks PM10 from 0900 to midday
21st Oct 14 18 0 17 LOW     Slightly higher very earl and again 0900-1000 hrs
22nd Oct 18 29 1 13 MODERATE     Heavier pulses 0400-1100 hrs. HIGH pollution peaks 2200-midnight
23rd Oct 19 25 1 11 MODERATE     Heaviest across midday and 2100-2300 hrs
24th Oct 19 25 1 13 MODERATE     Very High peak 0500 hrs
25th Oct 19 22 2 10 MODERATE     PM Peaks 0900-1100 hrs
26th Oct 15 19 0 10 LOW     Pulsing all day with traffic flows
27th Oct 16 20 1 12 MODERATE     Higher pollution in morning
28th Oct 16 21 1 15 MODERATE     Even pulses throughout the period
29th Oct 17 25 0 14 MODERATE     Even pulses throughout the period
30th Oct 14 21 0 16 MODERATE     Quieter afternoon
31st Oct 19 25 1 12 MODERATE     Pulsing throughout
NOVEMBER 2020
1st Nov 19 29 1 13 MODERATE     1810pm VERY HIGH peak of PM10. Otherwise Moderate.
2nd Nov 14 24 0 12 MODERATE     Busy midday and late evening
3rd Nov 20 26 2 8 MODERATE     2230-2330pm HIGH Peak. Pulsing throughout at Moderate levels
4th Nov 31 37 17 5 MODERATE     1800-1830 VERY HIGH all PMs and NOx. Busy evening.
5th Nov 41 42 12 4 MODERATE     LOCK DOWN 2 STARTS AND TRAFFIC DOESN'T CHANGE IN NEXT TWO WEEKS!:
Pronounced pollution 0400-0500 and evening
6th Nov 43 42 4 7 MODERATE     Evening and early periods polluted most.
7th Nov 44 38 10 10 MODERATE     Yet again both PMs are peaking all day
8th Nov 46 43 1 15 MODERATE     Foul air quality again. Worst between midday to 0800 hrs.
9th Nov 27 30 0 19 MODERATE     1150am PM10 at VERY HIGH
10th Nov 27 29 1 15 MODERATE     0200 -0400 hrs heaviest both PMs.
11th Nov 26 36 1 14 MODERATE     Between 06.40 and 07.20 PM10 and PM2.5 VERY HIGH pollution levels were reached - 20 Minutes short of "exceedance". From 1400 to midnight there were continuous pulses of HIGH pollution.
12th Nov 21 26 1 12 MODERATE     Overnight peaks finally dropped at 02.00am. The afternoon saw pulses of traffic congestion and peaks.
13th Nov 23 20 1 11 MODERATE     Moderate peaks from midday.
14th Nov 26 21 0 15 MODERATE     1740-17.25 VERY HIGH POLLUTION - 15 minutes short of "Exceedance" (100+ on the Scale)
15th Nov 20 16 1 13       Unremarkable.
16th Nov 20 15 1 12       Unremarkable.
17th Nov 22 24 0 20       Large continuous peak - 10.30-midday. Otherwise ripples all day.
18th Nov 24 23 1 14        
19th Nov 24 17 3 8        
20th Nov 5 18 4 8 LOW     Flow I data interrupted. Flow II. Peak 8pm and at 18.30 - graph
21st Nov 4 9 10 17 LOW     FLOW II data and graph
22nd Nov 4 11 2 10 LOW     FLOW II: Unremarkable.
23rd Nov 7 23 1 7 MODERATE     FLOW II: 09.00-10.30: Lengthy Peak. Otherwise unremarkable
24th Nov 4 14 3 6 LOW     FLOW II: Sharp PM 10 peak 1pm. Otherwise Low.
25th Nov 4 16 3 14 LOW     FLOW II: Very High sharp Peak 04.00am only
26th Nov 26 20 1 12 MODERATE     Flow I Data restored.
27th Nov 34 30 1 11 MODERATE      
28th Nov 48 43 4 14 MODERATE     High Peaks pulsing all day and night.
29th Nov 39 30 2 12 MODERATE     Escallating peaks from morning to evening
30th Nov 32 29 3 13 MODERATE     Higher peaks reduced gradually to 10.00am.
NOVEMBER 2020
1st Dec 20 25 3 8 MODERATE     Peaks from 8-10am.
2nd Dec 34 45 15 8 MODERATE   EXCEEDANCE VERY High Peaks midnight to 02.00am; Exceedance peaks of PM10: 16.25-18.25pm.
3rd Dec 25 28 15 12 MODERATE     VERY HIGH PEAKS of PM10 between 0620-8.40. Not an Exceedance as the level was not continuous.
4th Dec 23 18 7 11 MODERATE      
5th Dec 27 18 9 11 MODERATE      
6th Dec 27 16 8 12 MODERATE     PM2.5 grew throughout the day.
7th Dec 40 31 2 10 MODERATE     Both PMs increased through the day
8th Dec 47 36 9 12 MODERATE     Very close to an all-day exceedance of PM2.5
9th Dec 30 22 23 15 MODERATE      
10th Dec 26 20 5 15 MODERATE     "Swell" of NOx from morning through the evening.
11th Dec 23 17 5 21 MODERATE     Short VOC peal at midday
12th Dec 21 17 2 17 MODERATE      
13th Dec 32 22 20 14 MODERATE      
14th Dec 22 20 3 20 MODERATE     Ripples all afternoon and peak at 8pm
15th Dec 23 21 1 12 MODERATE     Sharp Peaks at 9am and midday
16th Dec 22 18 0 14 MODERATE     Peak at 19.00pm
17th Dec 20 19 3 12 MODERATE     Pulsing all day
18th Dec 22 18 0 14 MODERATE      
19th Dec 22 19 0 13 MODERATE     Pulsing all day.
20th Dec 23 20 1 8 MODERATE     PM10 Peak 0500am.
21st Dec 24 21 0 14 MODERATE     TIGHTER LOCKDOWN ANNOUNCED. HIGH peak 1220-1410 - both PMs.
22nd Dec 21 19 0 14 MODERATE      
23rd Dec 23 17 0 13 MODERATE     Flat until 1700pm peak to 1900.
24th Dec 18 17 0 4 LOW     Moderate peak 0600-0800; Flat pulsing otherwise.
25th Dec 28 17 2 3 MODERATE     Increasing PM2.5 from 1600-midnight
26th Dec 20 15 11 10 MODERATE     1110am-1250pm peak. Otherwise largely low pulses.
27th Dec 22 17 7 11 MODERATE     Increasing from 2000 to midnight
28th Dec 31 21 2 5 MODERATE     Early morning peak and late night.
29th Dec 35 20 2 5 MODERATE     One peak at 1500pm.
30th Dec 37 24 9 6 MODERATE     Significant peaks all day.
31st Dec 28 20 1 5 MODERATE     Continuous pulsing all Day.
2021 - JANUARY
1st Jan 42 38 18 7 MODERATE     High Peaks (PM10) from 1500-2200pm
2nd Jan 31 20 17 11 MODERATE     Pulsing all day. Short peak 2130pm
3rd Jan 34 23 15 11 MODERATE     Pulsing all day.Two sharp peaks early evening.
4th Jan 26 21 5 12 MODERATE     Pulsing all day. Sharp peak at 2000pm
5th Jan 26 18 6 11 MODERATE     One sharp peak 1000. Pulses all day.
6th Jan 27 16 9 12 MODERATE     Saw-tooth profile all day. Distinct highs and lows ranges.
7th Jan 38 29 10 11 MODERATE     Gradual rise high peak 1730-2045pm then sharp drop-off.
8th Jan 31 22 4 9 MODERATE     Saw-tooth all day pulsing.
9th Jan 36 30 9 12 MODERATE     Marked series of peaks into "Very High" from midday to 1600pm. Otherwise flat pulses.
10th Jan 31 25 9 11 MODERATE     Saw-tooth all day.
11th Jan 28 22 19 41 MODERATE     900am to 1700pm High periods.
12th Jan 19 14 2 33 MODERATE     Low all day to 1700 sharp peak. Pulses thereafter.
13th Jan 30 23 18 18 MODERATE     High peaks and periods from 0400 to 1845pm.
14th Jan 23 15 0 13 MODERATE     Pulsing all day
15th Jan 39 25 8 11 MODERATE     Moderate with higher peaks through the evening
16th Jan 33 24 12 17 MODERATE     Very busy peaks from minight to 1600p, then flat
17th Jan 24 21 4 15 MODERATE     Sunday: Pulsing all day with peak 2300-midnight
18th Jan 22 17 33 16 MODERATE     High from midday to 2200pm.
19th Jan 20 17 2 29 MODERATE     Quiet except for peaks at 11-12midday; 1800 peak.
20th Jan 20 14 0 23 MODERATE     Relatively quiet all day.
21st Jan 18 17 1 15 LOW     Even distribution. Spikes at 7am and 5pm.
22nd Jan 24 21 12 9 MODERATE     Even distribution in day; sharp up-ticks pm.
23rd Jan 32 21 3 6 MODERATE     Even distribution
24th Jan 28 24 11 5 MODERATE     Even. Spikes after 4pm
25th Jan 24 18 12 6 MODERATE     Active ripples all day
26th Jan 27 21 17 12 MODERATE     Sharp-toothed ripples all day. Bulge of NO2 from 4pm to 8pm.
27th Jan 29 21 7 21 MODERATE     PM10 Peak from 7-9am. Otherwise even spread of shallow pulses all day.
28th Jan 18 15 13 30 MODERATE     NO2 heavier from 11am to mid-afternoon
29th Jan 22 18 1 32 MODERATE     VOC sustained peaks at 11-noon, 3-4 pm trailing off during the evening.
30th Jan 23 17 1 11 MODERATE     Early morning peaks to 6am; Modest ripples thereafter.
31st Jan 38 25 6 7 MODERATE     Average was raised by spikes at 8-9am and 8-10pm.
FEBRUARY
1st Feb 7 12 3 10 LOW     Flat-lines early am and evning but higher through the business day.
2nd Feb 11 22 9 5 MODERATE     Lumps of pollution from midday.
3rd Feb 6 22 6 26 MODERATE     Sharp spike all night to 8-9am; huge spike of VOC 9-10pm. "22" is at margins of accuracy (+/- 10%)
4th Feb 25 20 3 15 MODERATE     Marginal measurement at 24 hr period.
5th Feb 26 18 1 14 MODERATE     Safely in-"Moderate" band. Pronounced lumps at times throughout.
6th Feb 32 22 3 11 MODERATE     Spikes throughout.
7th Feb 19 17 0 4 LOW     Marginal at "19" (+/- 10%). Spiky throughout.
8th Feb 11 15 0 4 LOW     Safely in "LOW"
9th Feb 7 13 2 4 LOW     Very good quality air. A couple of PM10 spikes - 7am and 12.30pm.
10th Feb 14 16 14 5 LOW     Good air. A few spikes.
11th Feb 17 14 7 6 LOW     Good air. Ripples throughout.
12th Feb 10 13 6 6 LOW     Good air except two pronounce spikes at 8am and 4pm.
13th Feb 9 13 7 8 LOW     Large VERY HIGH (241 !) spike at midday of NO2
14th Feb 12 36 4 16 MODERATE     Serious prolonged PM10 at VERY HIGH but just short of 1-hour
15th Feb 5 20 14 26 MODERATE     VOC HIGH plateau 11am-2pm.
16th Feb 4 20 6 27 MODERATE     VOC HIGH plateau 4-6.30pm.
17th Feb               Data Dropout - power lead loose
18th Feb               Data Dropout - power lead loose
19th Feb 19 19 8 13 LOW     Partial data set - unreliable
20th Feb 24 28 0 15 MODERATE     FLOW 1. Early am sharp spikes; calmer from midday
21st Feb 26 23 2 12 MODERATE     FLOW 1. Higher early am to 10am. Rising again from 8pm. All Particulates.
22nd Feb 26 22 1 12 MODERATE     FLOW 1. Saw-toothed all day.
23rd Feb 19 15 1 13 LOW     PM2.5 is marginal (+/- 10%). However major Particulate spikes 3-4.30pm skew the day's data.
24th Feb 19 22 1 15 MODERATE     Marginal. Swatoothed all day.
25th Feb 25 26 1 11 MODERATE     All Particulates PM10 VERY HIGH spike at 7pm.
26th Feb 27 26 6 6 MODERATE     Spiky all day. especially in the evening
27th Feb 34 25 8 5 MODERATE     Bulge midday to 3pm; rising from 7pm to 10pm.
28th Feb 35 35 2 8 MODERATE     PM10 VERY HIGH 10.13-30am
MARCH - [FLOW 2 TAKES OVER]
1st March 45 40 16 8 MODERATE     PM10 at VERY HIGH 9.30 peak
2nd March 54 52 5 14 HIGH EXCEEDANCE Marginal (+/- 10%) Saw-toothed throughout the day. Heavy traffic build-up.
3rd March 71 68 4 12 HIGH EXCEEDANCE Clearly an Exceedance Both particulates all day saw-toothed. Bulging in the afternoon.
4th March 32 33 0 10 MODERATE     Many High and Very High peaks midnight to 8.30am. Then low the remainder of the day
5th March 23 25 16 8 MODERATE     Full mix of pollutants. Spike of PM10 at 7pm
6th March 5 17 2 12 LOW     FLOW 2: Calm to 8am then rugged profile throughout the rest of the day.
7th March 7 25 2 12 MODERATE     Very sharp peaks at 4am, 8 and 9am before heavier pollution from 8pm.
8th March 17 40 7 17 MODERATE     Heavy pollution from 3am to 11am, then calmer.
9th March 6 21 10 24 MODERATE     VOC is the most serious; substantial peak 1.45 to 3pm
10 March 5 20 3 26 MODERATE     VOC was the culprit from 8am to 11am. Otherwise pretty flat.
11th March 5 23 6 29 MODERATE     Very serious pollution from 5am - 7am and another extended peak 11.30am-12.30pm
12th March 5 26 6 19 MODERATE EXCEEDANCE   Only just registers an Exceedance of PM10 from 5.50-6.50 in the early morning. From11am it is very flat throughout.
13th March 4 11 4 17 LOW     Some peaks, one bigger at 6.30pm but overall a good air day.
14th March 4 11 4 14 LOW     Lovely Day. Only peak at 10.30am
15th March 4 16 4 11 LOW     Serious peak at 9.20am
16th March 6 36 3 11 MODERATE     Unremarkable until 6.20pm through midnight with many VERY HIGH peaks in PM10.
17th March 13 82 2 10 HIGH EXCEEDANCE EXCEEDANCE Very firm 24-hour and hourly exceedances based on dangerous air from midnight to 12.30pm at VERY HIGH
18th March 7 48 2 11 MODERATE   EXCEEDANCE 09.13 - 10.13 VERY HIGH Exceedance (PM10) also VERY HIGH peak at 3.30pm
19th March 6 20 3 11 MODERATE     Very marginal. (+/- 10%)
20th March 5 18 6 12 LOW     Two peaks 10.15am and 11.30 am, otherwise clean.
21st March 6 31 7 13 MODERATE     Large peaks between 9.00am and 9.00pm.
22nd March 7 19 9 15 LOW     Marginal measurement (+/- 10%)
23rd March 5 19 6 26 MODERATE     Prolonged pollution 7-9am (PM10) and 4-7pm (VOC)
24th March 5 22 6 20 MODERATE     Heavy PM10 pollution between 5am - 8am. Then calmer.
25th March 4 11 6 22 MODERATE     VOCs higher in early evening; very clean morning
26th March 4 12 4 18 LOW     10.40 - 11.10 Sharp peak in PM10. Otherwise very clean
27th March 4 15 5 12 LOW     A GOOD day to be out and about. No serious peaks.
28th March 5 23 7 15 MODERATE     Good until a series of PM10 High/Very High Peaks between 4pm-8.30pm but no exceedance.
29th March 5 23 7 16 MODERATE     Calm until midday when there were five High/Very High peaks into the night.
30th March 6 23 10 11 MODERATE     Generally calm but with five High/Very High peaks especially from 8pm
31st March 6 28 12 16 MODERATE     Very serious 'patches' of peak High PM10 at 1am, 11am, 4pm, and 930pm.
APRIL - FLOW 2
1 April 9 33 3 9 MODERATE     Between 9am - 2pm there was a cluster of High Pollution - PM10
2 April 4 16 2 6 LOW     We are talking SERIOUSLY clean air all day
3 April 6 44 2 7 MODERATE     Saturday. What a difference a day makes! Continuous peaks of High pollution from 3am to 10pm. All PM10
4 April 4 21 5 13 MODERATE     Calm but Moderate peaks with one sharp peak at 8.40pm (PM10)
5 April 4 15 3 10 LOW     Beautifully clear but for one peak at 10.50pm (PM10)
6 April 4 14 6 10 LOW     High Polution (VOCs) 11.30am to midday. Otherwise a very good day.
7 April 4 14 10 10 LOW     A Good day to be exerting yourself! Clean Air.
8 April 4 10 8 18 -----     Incomplete data after midday. Internet break perhaps or server down? Not sure.
9 April 4 13 9 24 MODERATE     Friday. VOCs dominant until 9.25 - 0950pm with PM10 peaks
10 April 5 24 2 10 MODERATE     Saturday. Frequent PM10 peaks throughout the day with a partial lull between 11.30am-8.00pm (PM10)
11 April 5 17 7 10 LOW     Five High peaks - 3.30am, 9.40am and cluster after midday. Lowest from 3.30pm
12 April 4 11 8 12 LOW     Lockdown keeps on delivering!
13 April 4 13 13 19 LOW     2.45-3.30pm High peak (VOC). That's pretty much it.
14 April 6 18 10 13 LOW     Saw-toothed peaks all day - traffic continuous all day - but not to worry - one minor High peak at 7.50am
15 April 4 15 7 12 LOW     Saw-toothed peaks all day - traffic continuous all day - but not to worry
16 April 4 16 7 11 LOW     Very low except 7.40 - 10.10am PM10 series of High Peaks.
17 April 4 15 11 12 LOW     Very low all day, until 10.00 - 10.30pm massive spike of PM10, then calm again. Suggests stuck traffic.
18 April 5 15 15 14 LOW     Very Low, except a massive PM peak 2.30am to 3.30am - PM10 but also "22" PM2.5! Smaller peak Very High 9.35-9.40pm. Not enough for an Excedance but worrying at night time.
19 April 5 17 11 13 LOW     Saw-toothed all morning until a massive peak (PM10) at 11.30 am then very LOW.
20 April 11 28 4 12 MODERATE     Series of regular sharp peaks all day.
PM2.5
dominating until 9.45am
21 April 8 58 4 10 HIGH   EXCEEDANCE Thursday. Very High from 2.30-435am. Calmed down from 8.00am. Patchy recording after 2pm
22 April 4 17 14 13 LOW     Strange shape to pollution distribution. Sharp clusters of peaks from midnight to 2.00am; another from 8am to 10.20 then a 'bulge' until 4pm then slow decline. Curious.
23 April 4 17 8 12 LOW     Some modest peaks but very clean between 8am - 5pm. PM10 peaks.
24 April - - - - -     INCOMPLETE DATA.
25 April 4 17 8 12 LOW     Traffic peaks not seriously congested so low all day.
26 April 4 14 5 12 LOW     Traffic peaks not seriously congested so low all day. One sharp peak at 11.30pm.
27 April 5 17 12 14 LOW     Significant peaks 7 - 11.30am. Otherwise OK
28 April 6 29 11 13 MODERATE     Serious peaks all day. Harshest PM10 with some serious VOCs mixed in.
29 April - - - - -     INCOMPLETE DATA.
30 April 7 13 10 14 LOW     High peak at 7.30am and again at 10.30pm. Otherwise seriously clean
MAY - FLOW 2
1st May 4 13 12 13 LOW     Good day with only two sharp peaks of PM10 and NO2 at 3pm and 6.50pm
2nd May - - - - -     PARIS SERVER FAILURE
3rd May 4 10 8 15 LOW     Very Low. Blowing a Gale!
4th May 4 14 9 12 LOW     Very calm except between 9am and 12am when there was a succession of HIGH and VERY HIGH peaks in PM10 from congestion. Knowing and proving this is only possible with "real time" monitoring.
5th May 4 10 6 10 LOW     Very LOW except for 1220pm-1310 that touched VERY HIGH
6th May 4 11 8 10 LOW     Three VERY HIGH and HGH peaks but otherwise calm and LOW
7th May 7 15 11 13 LOW     LOW except for periods of HIGH - 0245-0340; 0750-0810; and 2250-2310pm
8th May 7 12 7 21 MODERATE     Very LOW until 1050 when PM10 and VOCs were at serious levels especially peaking at 1250pm, 1540-1610pm, and 1745-1840pm.
9th May 4 16 14 22 MODERATE     LOW until 100am, sharp peak HIGH at midday then MODERATE to midnight.
10th May 4 16 7 19 LOW     Only just under MODERATE; peaks from 0940 with a surprisingly sharp and HIGH PM10 at 2335pm.
11th May 5 23 9 14 MODERATE     HIGH and VERY HIGH peaks of PM10 early morning (0130-0730). Rippling LOW/MODERATE the remainder of the day.
12th May 6 32 10 13 MODERATE     VERY HIGH peaks of PM10 at 0210, 0640, 0810. Batch of HIGH between 2200-2330pm. Rippling peaks all day
13th May 4 12 2 10 LOW     Gentle day. Peaks of PM10 all day but not seriously high.
14th May 4 12 3 10 LOW     Sharp peak of PM10 at 0020am, clean until pronounced peaks between 1640-2110pm.
15th May 6 13 4 13 LOW     Quiet until midday. VERY HIGH from 1218 to 1252 - avoiding "exceedance" followed by troubling peaks until 1840pm. Very LOW outside this period.
16th May 4 22 5 14 MODERATE     Serious peaks from midnight 0930am, then quieter.
17th May 4 16 4 12 LOW     Quiet until 1015am to 1105 VERY HIGH period of PM10. Lesser ripples until 1800pm.
18th May 4 13 9 14 LOW     Pronounced isolated peaks from 0800am of PM10. Otherwise calm.
19th May 6 12 5 12 LOW     HIGH and VERY HIGH peaks 1000-1120am and another HIGH peak 1720-1750. Calm at other times.
20th May 4 15 4 14 LOW     Quiet until 2100 and a series of HIGH peaks of PM10 through midnight.
21st May 9 50 4 17 HIGH EXCEEDANCE   FRIDAY. VERY HIGH peaks of PM10 continuous from 0200am to 0750am - just avoiding one hour exceedances at VERY HIGH. Significant peaks throughout the remainder of the day
22nd May 4 16 4 12 LOW     Sharp HIGH peaks stopped at 0400am. Small peaks 1200-1300pm. Otherwise flat.
23rd May 4 10 7 12 LOW     LOW ripples 0900 to 1400pm and again 2230 to midnight.
24th May 4 17 7 12 LOW     Overnight peaks ended at 0200am. Noticeable peaks 0745-0845 and 1845-1930pm.
25th May 4 11 6 11 LOW     Flat LOW except 0945-1230pm peaks.
26th May 14 16 2 12 LOW     Jagged All day. Slightly heavier early until 1600pm when the levels reduced significantly.
27th May 16 15 1 11 LOW     Significant peaks around 0300am and again around 1500pm. Otherwise modest ripples.
28th May 17 20 1 11 MODERATE     Marginal reading. Jagged peaks for 24 hours - PM10 dominating.
29th May 18 16 1 11 LOW     1230-1350 extended peak but otherwise very LOW.
30th May 19 16 0 11 LOW     Marginal reading. Continuous peaks above (MODERATE) and below (LOW) throughout the whole day reflecting traffic conditions.
31st May 25 24 0 15 MODERATE     Firmly MODERATE in daylight hours with pronounced bulge in both PM2.5 and PM10 from 1420 to 1930pm.
JUNE - FLOW 2
1st June 18 19 2 14 LOW     Saw-toothed peaks all day. Two noticeable peaks around 1600pm only.
2nd June 22 23 1 14 MODERATE     Jagged and increasing levels of pollution throughout the day to midnight. VOCs mirrored all day too.
3th June 4 9 4 21 MODERATE     PM10 very prounounced early morning; VOC takes over from 0900am to day's end.
4th June 4 9 0 13 LOW     Most activity between 0845 to 1400pm. Very LOW ripples at other times.
5th June 4 7 7 12 LOW     A really good day throughout.
6th June 4 10 12 16 LOW     Another good day with isolated peaks between 0400-0500am.
7th June 5 18 2 17 LOW   EXCEEDANCE Real-time measurements allow us to see extremes in pollution in days that average LOW. This excedance (0500-0600) was measured amongst a series of VERY HIGH PM10 events from 0455 to 0700am. One other modest HIGH peak at 0950. The "average" was possible because pollution flattened out from 1000am.
8th June 4 12 1 17 LOW     High peaks until 0200am and isolated very high PM10 at 0830am. Calm otherwise.
9th June 11 12 1 18 LOW   EXCEEDANCE During a flat day - VERY HIGH plateau just makes an exceedance between 1738-1838 - both PM2.5 and PM10 involved. Very flat otherwise.
10th June 6 11 2 16 LOW     Flat except for pronounced series of HIGH peaks 1130am to 1320pm.
11th June 4 10 0 15 LOW     MODERATE peaks from 0500 ended with a VERY HIGH peak of PM10 (PM2.5 just a bit lower) 0845am
12th June 4 13 4 11 LOW     A good day except for pronounced (up to VERY HIGH) between 1230 to 1600pm of PM10.
13th June 4 13 0 14 LOW     Flat except 0200am and again 1600-1700 series.
14th June 4 11 2 14 LOW     Calm day until 2300 to midnight sharp peaks of PM10.
15th June 4 11 5 10 LOW     LOW jagged line with one High Peak at 0720am.
16th June 4 16 0 18 LOW     LOW with VERY HIGH peak at 0730am and 1230pm, lesser peaks in between.
17th June 7 12 4 13 LOW     Modest pollution but for a short VERY HIGH peak at 0150am.
18th June 5 17 0 10 LOW     Peaking to MODERATE until 0700am, then again between 1050-1350pm and 1700-1850pm.
19th June 4 18 0 9 LOW     Flat and safely LOW all day until 2050 HIGH peaks until midnight.
20th June                

Note: There are no known lower safety levels for PM2.5 (W.H.O.)

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