Air Pollution in Hillingdon: Real-time Air Quality Index and smog alert.
Pollution and air quality forecast for Hillingdon. Today is Sunday, May 19, 2024. The following air pollution values have been recorded for Hillingdon:- ozone (O3) - 75 (Moderate)
- particulate matter (PM2.5) dust - 5 (Good)
- particulate matter (PM10) suspended dust - 12 (Good)
- nitrogen dioxide (NO2) - 10 (Good)
What is the air quality in Hillingdon today? Is the air polluted in Hillingdon?. Is there smog?
Today (Tuesday, April 16, 2024) air quality is moderate in Hillingdon.
Some pollutants in Hillingdon may slightly affect very few hypersensitive individuals. Air pollutants in Hillingdon may cause minor breathing discomfort to sensitive people.
How is the O3 level today in Hillingdon? (ozone (O3))
75 (Moderate)
What is the current level of PM2.5 in Hillingdon? (particulate matter (PM2.5) dust)
Today's PM2.5 level is:
5 (Good)
For comparison, the highest level of PM2.5 in Hillingdon in the last 7 days was: 9 (Monday, February 5, 2024) and the lowest: 2 (Saturday, February 3, 2024).
The highest PM2.5 values were recorded: 21 (April 2019).
The lowest level of particulate matter PM2.5 pollution occurs in month: August (4.9).
What is the level of PM10 today in Hillingdon? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Hillingdon is:
12 (Good)
The highest PM10 values usually occur in month: 29 (April 2019).
The lowest value of particulate matter PM10 pollution in Hillingdon is usually recorded in: December (9.6).
How high is the level of NO2? (nitrogen dioxide (NO2))
10 (Good)
Current data Tuesday, April 16, 2024, 1:00 AM
O3 75 (Moderate)
PM2,5 5 (Good)
PM10 12 (Good)
NO2 10 (Good)
Data on air pollution from recent days in Hillingdon
index
2024-01-31
2024-02-02
2024-02-03
2024-02-05
2024-02-06
2024-02-07
2024-04-10
2024-04-11
2024-04-12
2024-04-13
2024-04-14
2024-04-15
2024-04-16
no2
22
Good
13
Good
8
Good
19
Good
12
Good
8
Good
23
Good
24
Good
27
Good
20
Good
14
Good
8
Good
3
Good
pm25
4
Good
4
Good
2
Good
9
Good
7
Good
7
Good
5
Good
4
Good
5
Good
5
Good
4
Good
3
Good
3
Good
o3
46
Good
63
Good
65
Good
53
Good
60
Good
64
Good
51
Good
39
Good
39
Good
43
Good
63
Good
76
Moderate
83
Moderate
pm10
8
Good
7
Good
4
Good
20
Moderate
16
Good
15
Good
15
Good
8
Good
11
Good
11
Good
8
Good
8
Good
8
Good
data source »
Air pollution in Hillingdon from August 2015 to May 2020
index
2020-05
2020-04
2020-03
2020-02
2020-01
2019-12
2019-11
2019-10
2019-09
2019-08
2019-07
2019-06
2019-05
2019-04
2019-03
2019-02
2019-01
2018-12
2018-11
2018-10
2018-09
2018-08
2018-07
2018-06
2018-05
2018-04
2018-03
2018-02
2018-01
2017-12
2017-11
2017-10
2017-09
2017-08
2017-07
2017-06
2017-05
2017-04
2017-03
2017-02
2017-01
2016-12
2016-11
2016-10
2016-09
2016-08
2016-07
2016-06
2016-05
2016-04
2016-03
2016-02
2016-01
2015-12
2015-11
2015-10
2015-09
2015-08
no2
18 (Good)
22 (Good)
26 (Good)
29 (Good)
41 (Moderate)
44 (Moderate)
42 (Moderate)
36 (Good)
31 (Good)
35 (Good)
28 (Good)
32 (Good)
31 (Good)
40 (Moderate)
45 (Moderate)
56 (Moderate)
47 (Moderate)
44 (Moderate)
45 (Moderate)
32 (Good)
34 (Good)
28 (Good)
33 (Good)
24 (Good)
34 (Good)
38 (Good)
40 (Good)
36 (Good)
40 (Good)
39 (Good)
41 (Moderate)
36 (Good)
37 (Good)
35 (Good)
29 (Good)
35 (Good)
39 (Good)
44 (Moderate)
52 (Moderate)
51 (Moderate)
67 (Moderate)
65 (Moderate)
53 (Moderate)
38 (Good)
41 (Moderate)
31 (Good)
32 (Good)
34 (Good)
35 (Good)
39 (Good)
40 (Good)
33 (Good)
41 (Moderate)
43 (Moderate)
43 (Moderate)
51 (Moderate)
34 (Good)
33 (Good)
pm25
8.6 (Good)
14 (Moderate)
8.7 (Good)
6.5 (Good)
9.4 (Good)
8.4 (Good)
9.6 (Good)
7.5 (Good)
5.3 (Good)
6.9 (Good)
6 (Good)
6.6 (Good)
8.2 (Good)
21 (Moderate)
8.9 (Good)
15 (Moderate)
11 (Good)
7.5 (Good)
13 (Good)
7.8 (Good)
5.2 (Good)
4.9 (Good)
8.6 (Good)
8.5 (Good)
14 (Moderate)
12 (Good)
13 (Good)
9.9 (Good)
8.7 (Good)
6.7 (Good)
9.8 (Good)
7.8 (Good)
7.9 (Good)
7.3 (Good)
6 (Good)
7.9 (Good)
9.8 (Good)
11 (Good)
10 (Good)
13 (Moderate)
20 (Moderate)
20 (Moderate)
8.5 (Good)
9.6 (Good)
11 (Good)
- (Good)
15 (Moderate)
14 (Moderate)
16 (Moderate)
13 (Moderate)
19 (Moderate)
13 (Moderate)
9.5 (Good)
13 (Good)
14 (Moderate)
17 (Moderate)
12 (Good)
17 (Moderate)
pm10
14 (Good)
23 (Moderate)
14 (Good)
11 (Good)
14 (Good)
12 (Good)
14 (Good)
12 (Good)
12 (Good)
13 (Good)
13 (Good)
11 (Good)
14 (Good)
29 (Moderate)
14 (Good)
22 (Moderate)
16 (Good)
11 (Good)
18 (Good)
13 (Good)
11 (Good)
11 (Good)
18 (Good)
16 (Good)
21 (Moderate)
17 (Good)
18 (Good)
15 (Good)
13 (Good)
9.6 (Good)
15 (Good)
13 (Good)
12 (Good)
13 (Good)
12 (Good)
15 (Good)
16 (Good)
19 (Good)
15 (Good)
17 (Good)
25 (Moderate)
25 (Moderate)
13 (Good)
14 (Good)
16 (Good)
- (Good)
17 (Good)
17 (Good)
21 (Moderate)
16 (Good)
23 (Moderate)
15 (Good)
11 (Good)
17 (Good)
16 (Good)
19 (Good)
14 (Good)
- (Good)
o3
64 (Good)
57 (Good)
52 (Good)
47 (Good)
30 (Good)
26 (Good)
18 (Good)
25 (Good)
30 (Good)
37 (Good)
39 (Good)
40 (Good)
44 (Good)
49 (Good)
47 (Good)
22 (Good)
28 (Good)
25 (Good)
18 (Good)
27 (Good)
30 (Good)
30 (Good)
50 (Good)
48 (Good)
53 (Good)
43 (Good)
38 (Good)
34 (Good)
32 (Good)
29 (Good)
23 (Good)
20 (Good)
17 (Good)
22 (Good)
42 (Good)
45 (Good)
37 (Good)
43 (Good)
40 (Good)
29 (Good)
16 (Good)
12 (Good)
22 (Good)
17 (Good)
21 (Good)
36 (Good)
30 (Good)
34 (Good)
47 (Good)
42 (Good)
39 (Good)
36 (Good)
32 (Good)
31 (Good)
26 (Good)
17 (Good)
28 (Good)
28 (Good)
data source »
London Harlington
Wednesday, February 7, 2024, 8:00 AM
O3 67 (Good)
ozone (O3)
PM2,5 7 (Good)
particulate matter (PM2.5) dust
PM10 15 (Good)
particulate matter (PM10) suspended dust
NO2 18 (Good)
nitrogen dioxide (NO2)
London Hillingdon
Tuesday, April 16, 2024, 1:00 AM
PM2,5 3 (Good)
particulate matter (PM2.5) dust
O3 82 (Moderate)
ozone (O3)
PM10 8 (Good)
particulate matter (PM10) suspended dust
NO2 2 (Good)
nitrogen dioxide (NO2)
London Harlington
index
2024-02-07
2024-02-06
2024-02-05
2024-02-03
2024-02-02
2024-01-31
no2
8.3
12
19
7.6
13
22
pm25
7.2
7.3
8.5
2
4.2
4
o3
64
60
53
65
63
46
pm10
15
16
20
4.5
7.2
7.5
London Hillingdon
index
2024-04-16
2024-04-15
2024-04-14
2024-04-13
2024-04-12
2024-04-11
2024-04-10
pm10
8
7.8
7.9
11
11
8.2
15
o3
83
76
63
43
39
39
51
pm25
3
3.3
4.4
5
5.3
3.6
5
no2
2.5
8.2
14
20
27
24
23
London Harlington
2015-08 2020-05
index
2020-05
2020-04
2020-03
2020-02
2020-01
2019-12
2019-11
2019-10
2019-09
2019-08
2019-07
2019-06
2019-05
2019-04
2019-03
2019-02
2019-01
2018-12
2018-11
2018-10
2018-09
2018-08
2018-07
2018-06
2018-05
2018-04
2018-03
2018-02
2018-01
2017-12
2017-11
2017-10
2017-09
2017-08
2017-07
2017-06
2017-05
2017-04
2017-03
2017-02
2017-01
2016-12
2016-11
2016-10
2016-09
2016-08
2016-07
2016-06
2016-05
2016-04
2016-03
2016-02
2016-01
2015-12
2015-11
2015-10
2015-09
2015-08
o3
67
58
55
51
35
29
21
29
34
45
44
47
46
52
52
25
30
29
22
30
38
34
53
49
55
51
46
39
40
33
27
23
22
24
48
54
-
44
48
37
21
16
26
21
31
41
36
40
53
49
42
41
37
38
31
22
31
31
no2
11
19
22
23
32
38
35
28
24
24
20
23
26
35
29
53
45
37
33
27
25
17
22
17
27
23
22
24
22
25
27
20
20
17
21
23
30
36
36
38
60
58
45
31
24
19
20
25
22
22
28
9.2
25
24
27
31
22
17
pm25
8.6
14
8.7
6.5
9.4
8.4
9.6
7.5
5.3
6.9
6
6.6
8.2
21
8.9
15
11
7.5
13
7.8
5.2
4.9
8.6
8.5
14
12
13
9.9
8.7
6.7
9.8
7.8
7.9
7.3
6
7.9
9.8
11
10
13
20
20
8.5
9.6
11
-
15
14
16
13
19
13
9.5
13
14
17
12
17
pm10
14
23
14
11
14
12
14
12
12
13
13
11
14
29
14
22
16
11
18
13
11
11
18
16
21
17
18
15
13
9.6
15
13
12
13
12
15
16
19
15
17
25
25
13
14
16
-
17
17
21
16
23
15
11
17
16
19
14
-
London Hillingdon
index
2020-05
2020-04
2020-03
2020-02
2020-01
2019-12
2019-11
2019-10
2019-09
2019-08
2019-07
2019-06
2019-05
2019-04
2019-03
2019-02
2019-01
2018-12
2018-11
2018-10
2018-09
2018-08
2018-07
2018-06
2018-05
2018-04
2018-03
2018-02
2018-01
2017-12
2017-11
2017-10
2017-09
2017-08
2017-07
2017-06
2017-05
2017-04
2017-03
2017-02
2017-01
2016-12
2016-11
2016-10
2016-09
2016-08
2016-07
2016-06
2016-05
2016-04
2016-03
2016-02
2016-01
2015-12
2015-11
2015-10
2015-09
2015-08
o3
61
56
48
43
25
23
15
21
26
29
34
33
42
45
43
18
26
22
14
25
23
26
48
47
51
35
30
30
24
24
18
17
13
20
35
36
37
41
31
22
12
7.7
18
14
12
30
25
28
42
35
35
31
26
24
20
12
24
24
no2
24
26
29
34
50
49
49
44
38
47
35
41
36
46
61
60
49
51
58
37
42
40
45
31
41
53
57
49
57
52
55
52
54
52
38
46
48
52
68
64
75
72
60
45
57
44
44
44
48
57
52
57
58
62
59
71
46
50
* Pollution data source:
https://openaq.org
(DEFRA)
The data is licensed under CC-By 4.0
O3 75 (Moderate)
PM2,5 5 (Good)
PM10 12 (Good)
NO2 10 (Good)
Data on air pollution from recent days in Hillingdon
| index | 2024-01-31 | 2024-02-02 | 2024-02-03 | 2024-02-05 | 2024-02-06 | 2024-02-07 | 2024-04-10 | 2024-04-11 | 2024-04-12 | 2024-04-13 | 2024-04-14 | 2024-04-15 | 2024-04-16 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 22 Good |
13 Good |
8 Good |
19 Good |
12 Good |
8 Good |
23 Good |
24 Good |
27 Good |
20 Good |
14 Good |
8 Good |
3 Good |
| pm25 | 4 Good |
4 Good |
2 Good |
9 Good |
7 Good |
7 Good |
5 Good |
4 Good |
5 Good |
5 Good |
4 Good |
3 Good |
3 Good |
| o3 | 46 Good |
63 Good |
65 Good |
53 Good |
60 Good |
64 Good |
51 Good |
39 Good |
39 Good |
43 Good |
63 Good |
76 Moderate |
83 Moderate |
| pm10 | 8 Good |
7 Good |
4 Good |
20 Moderate |
16 Good |
15 Good |
15 Good |
8 Good |
11 Good |
11 Good |
8 Good |
8 Good |
8 Good |
| index | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 | 2016-02 | 2016-01 | 2015-12 | 2015-11 | 2015-10 | 2015-09 | 2015-08 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 18 (Good) | 22 (Good) | 26 (Good) | 29 (Good) | 41 (Moderate) | 44 (Moderate) | 42 (Moderate) | 36 (Good) | 31 (Good) | 35 (Good) | 28 (Good) | 32 (Good) | 31 (Good) | 40 (Moderate) | 45 (Moderate) | 56 (Moderate) | 47 (Moderate) | 44 (Moderate) | 45 (Moderate) | 32 (Good) | 34 (Good) | 28 (Good) | 33 (Good) | 24 (Good) | 34 (Good) | 38 (Good) | 40 (Good) | 36 (Good) | 40 (Good) | 39 (Good) | 41 (Moderate) | 36 (Good) | 37 (Good) | 35 (Good) | 29 (Good) | 35 (Good) | 39 (Good) | 44 (Moderate) | 52 (Moderate) | 51 (Moderate) | 67 (Moderate) | 65 (Moderate) | 53 (Moderate) | 38 (Good) | 41 (Moderate) | 31 (Good) | 32 (Good) | 34 (Good) | 35 (Good) | 39 (Good) | 40 (Good) | 33 (Good) | 41 (Moderate) | 43 (Moderate) | 43 (Moderate) | 51 (Moderate) | 34 (Good) | 33 (Good) |
| pm25 | 8.6 (Good) | 14 (Moderate) | 8.7 (Good) | 6.5 (Good) | 9.4 (Good) | 8.4 (Good) | 9.6 (Good) | 7.5 (Good) | 5.3 (Good) | 6.9 (Good) | 6 (Good) | 6.6 (Good) | 8.2 (Good) | 21 (Moderate) | 8.9 (Good) | 15 (Moderate) | 11 (Good) | 7.5 (Good) | 13 (Good) | 7.8 (Good) | 5.2 (Good) | 4.9 (Good) | 8.6 (Good) | 8.5 (Good) | 14 (Moderate) | 12 (Good) | 13 (Good) | 9.9 (Good) | 8.7 (Good) | 6.7 (Good) | 9.8 (Good) | 7.8 (Good) | 7.9 (Good) | 7.3 (Good) | 6 (Good) | 7.9 (Good) | 9.8 (Good) | 11 (Good) | 10 (Good) | 13 (Moderate) | 20 (Moderate) | 20 (Moderate) | 8.5 (Good) | 9.6 (Good) | 11 (Good) | - (Good) | 15 (Moderate) | 14 (Moderate) | 16 (Moderate) | 13 (Moderate) | 19 (Moderate) | 13 (Moderate) | 9.5 (Good) | 13 (Good) | 14 (Moderate) | 17 (Moderate) | 12 (Good) | 17 (Moderate) |
| pm10 | 14 (Good) | 23 (Moderate) | 14 (Good) | 11 (Good) | 14 (Good) | 12 (Good) | 14 (Good) | 12 (Good) | 12 (Good) | 13 (Good) | 13 (Good) | 11 (Good) | 14 (Good) | 29 (Moderate) | 14 (Good) | 22 (Moderate) | 16 (Good) | 11 (Good) | 18 (Good) | 13 (Good) | 11 (Good) | 11 (Good) | 18 (Good) | 16 (Good) | 21 (Moderate) | 17 (Good) | 18 (Good) | 15 (Good) | 13 (Good) | 9.6 (Good) | 15 (Good) | 13 (Good) | 12 (Good) | 13 (Good) | 12 (Good) | 15 (Good) | 16 (Good) | 19 (Good) | 15 (Good) | 17 (Good) | 25 (Moderate) | 25 (Moderate) | 13 (Good) | 14 (Good) | 16 (Good) | - (Good) | 17 (Good) | 17 (Good) | 21 (Moderate) | 16 (Good) | 23 (Moderate) | 15 (Good) | 11 (Good) | 17 (Good) | 16 (Good) | 19 (Good) | 14 (Good) | - (Good) |
| o3 | 64 (Good) | 57 (Good) | 52 (Good) | 47 (Good) | 30 (Good) | 26 (Good) | 18 (Good) | 25 (Good) | 30 (Good) | 37 (Good) | 39 (Good) | 40 (Good) | 44 (Good) | 49 (Good) | 47 (Good) | 22 (Good) | 28 (Good) | 25 (Good) | 18 (Good) | 27 (Good) | 30 (Good) | 30 (Good) | 50 (Good) | 48 (Good) | 53 (Good) | 43 (Good) | 38 (Good) | 34 (Good) | 32 (Good) | 29 (Good) | 23 (Good) | 20 (Good) | 17 (Good) | 22 (Good) | 42 (Good) | 45 (Good) | 37 (Good) | 43 (Good) | 40 (Good) | 29 (Good) | 16 (Good) | 12 (Good) | 22 (Good) | 17 (Good) | 21 (Good) | 36 (Good) | 30 (Good) | 34 (Good) | 47 (Good) | 42 (Good) | 39 (Good) | 36 (Good) | 32 (Good) | 31 (Good) | 26 (Good) | 17 (Good) | 28 (Good) | 28 (Good) |
O3 67 (Good)
ozone (O3)PM2,5 7 (Good)
particulate matter (PM2.5) dustPM10 15 (Good)
particulate matter (PM10) suspended dustNO2 18 (Good)
nitrogen dioxide (NO2)PM2,5 3 (Good)
particulate matter (PM2.5) dustO3 82 (Moderate)
ozone (O3)PM10 8 (Good)
particulate matter (PM10) suspended dustNO2 2 (Good)
nitrogen dioxide (NO2)London Harlington
| index | 2024-02-07 | 2024-02-06 | 2024-02-05 | 2024-02-03 | 2024-02-02 | 2024-01-31 |
|---|---|---|---|---|---|---|
| no2 | 8.3 | 12 | 19 | 7.6 | 13 | 22 |
| pm25 | 7.2 | 7.3 | 8.5 | 2 | 4.2 | 4 |
| o3 | 64 | 60 | 53 | 65 | 63 | 46 |
| pm10 | 15 | 16 | 20 | 4.5 | 7.2 | 7.5 |
London Hillingdon
| index | 2024-04-16 | 2024-04-15 | 2024-04-14 | 2024-04-13 | 2024-04-12 | 2024-04-11 | 2024-04-10 |
|---|---|---|---|---|---|---|---|
| pm10 | 8 | 7.8 | 7.9 | 11 | 11 | 8.2 | 15 |
| o3 | 83 | 76 | 63 | 43 | 39 | 39 | 51 |
| pm25 | 3 | 3.3 | 4.4 | 5 | 5.3 | 3.6 | 5 |
| no2 | 2.5 | 8.2 | 14 | 20 | 27 | 24 | 23 |
London Harlington
| index | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 | 2016-02 | 2016-01 | 2015-12 | 2015-11 | 2015-10 | 2015-09 | 2015-08 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| o3 | 67 | 58 | 55 | 51 | 35 | 29 | 21 | 29 | 34 | 45 | 44 | 47 | 46 | 52 | 52 | 25 | 30 | 29 | 22 | 30 | 38 | 34 | 53 | 49 | 55 | 51 | 46 | 39 | 40 | 33 | 27 | 23 | 22 | 24 | 48 | 54 | - | 44 | 48 | 37 | 21 | 16 | 26 | 21 | 31 | 41 | 36 | 40 | 53 | 49 | 42 | 41 | 37 | 38 | 31 | 22 | 31 | 31 |
| no2 | 11 | 19 | 22 | 23 | 32 | 38 | 35 | 28 | 24 | 24 | 20 | 23 | 26 | 35 | 29 | 53 | 45 | 37 | 33 | 27 | 25 | 17 | 22 | 17 | 27 | 23 | 22 | 24 | 22 | 25 | 27 | 20 | 20 | 17 | 21 | 23 | 30 | 36 | 36 | 38 | 60 | 58 | 45 | 31 | 24 | 19 | 20 | 25 | 22 | 22 | 28 | 9.2 | 25 | 24 | 27 | 31 | 22 | 17 |
| pm25 | 8.6 | 14 | 8.7 | 6.5 | 9.4 | 8.4 | 9.6 | 7.5 | 5.3 | 6.9 | 6 | 6.6 | 8.2 | 21 | 8.9 | 15 | 11 | 7.5 | 13 | 7.8 | 5.2 | 4.9 | 8.6 | 8.5 | 14 | 12 | 13 | 9.9 | 8.7 | 6.7 | 9.8 | 7.8 | 7.9 | 7.3 | 6 | 7.9 | 9.8 | 11 | 10 | 13 | 20 | 20 | 8.5 | 9.6 | 11 | - | 15 | 14 | 16 | 13 | 19 | 13 | 9.5 | 13 | 14 | 17 | 12 | 17 |
| pm10 | 14 | 23 | 14 | 11 | 14 | 12 | 14 | 12 | 12 | 13 | 13 | 11 | 14 | 29 | 14 | 22 | 16 | 11 | 18 | 13 | 11 | 11 | 18 | 16 | 21 | 17 | 18 | 15 | 13 | 9.6 | 15 | 13 | 12 | 13 | 12 | 15 | 16 | 19 | 15 | 17 | 25 | 25 | 13 | 14 | 16 | - | 17 | 17 | 21 | 16 | 23 | 15 | 11 | 17 | 16 | 19 | 14 | - |
London Hillingdon
| index | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 | 2016-02 | 2016-01 | 2015-12 | 2015-11 | 2015-10 | 2015-09 | 2015-08 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| o3 | 61 | 56 | 48 | 43 | 25 | 23 | 15 | 21 | 26 | 29 | 34 | 33 | 42 | 45 | 43 | 18 | 26 | 22 | 14 | 25 | 23 | 26 | 48 | 47 | 51 | 35 | 30 | 30 | 24 | 24 | 18 | 17 | 13 | 20 | 35 | 36 | 37 | 41 | 31 | 22 | 12 | 7.7 | 18 | 14 | 12 | 30 | 25 | 28 | 42 | 35 | 35 | 31 | 26 | 24 | 20 | 12 | 24 | 24 |
| no2 | 24 | 26 | 29 | 34 | 50 | 49 | 49 | 44 | 38 | 47 | 35 | 41 | 36 | 46 | 61 | 60 | 49 | 51 | 58 | 37 | 42 | 40 | 45 | 31 | 41 | 53 | 57 | 49 | 57 | 52 | 55 | 52 | 54 | 52 | 38 | 46 | 48 | 52 | 68 | 64 | 75 | 72 | 60 | 45 | 57 | 44 | 44 | 44 | 48 | 57 | 52 | 57 | 58 | 62 | 59 | 71 | 46 | 50 |