World's most polluted cities (historical data 2017-2021)

Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)

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2021

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World air quality report

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2021 World air quality report

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Meets WHO guideline
Exceeds by 1 to 2 times
Exceeds by 2 to 3 times
Exceeds by 3 to 5 times
Exceeds by 5 to 7 times
Exceeds by 7 to 10 times
Exceeds by over 10 times
RankAscending icon
City 2021 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2020 2019 2018 2017
1 Canada
Savona, Canada
26.4 6.8 5.7 4.1 3.3 3.3 10.5 129.5 78.5 8.5 5.5 8.6 5.3 7.2 7.5 - -
2 Canada
Lumby, Canada
25.9 - - 15.1 8.4 5 4.7 197.3 84.8 15.1 14.8 22.1 20 - - - -
3 Canada
Golden, Canada
22.2 22.3 24.7 17.8 10.3 4.7 7.2 64.7 40 8.9 15.7 25.1 22.8 11.5 - - -
4 Canada
Clearwater, Canada
21.3 25.9 18.7 18.2 8.3 4.3 6.6 63.6 43.9 6.1 7.9 5.1 - 15.5 13.9 - -
5 Canada
Trail, Canada
21.3 13.1 8.1 5.9 6.2 5.9 8 69.5 78.4 22 7.5 12.2 7.2 - - - -
6 Canada
Castlegar, Canada
21.1 8.2 5.7 8.2 8.6 4.9 6.3 87.2 68.8 14.6 8 12.5 8 10.8 - - -
7 Canada
Scotch Creek, Canada
20.1 10.7 7.3 10 6.2 4.7 9 68.8 67.1 8.6 6.6 7.9 4.1 9.4 8.5 - -
8 Canada
Vernon, Canada
18.6 9.5 5.9 8 5.1 3.4 6.1 65.9 74.9 11.6 8.5 10.6 7.3 7.8 9.1 - -
9 Canada
Revelstoke, Canada
18.2 16.9 12.9 16.1 7.6 4.3 7.5 71.4 51.8 3.9 9.5 11.3 7 - - - -
10 Canada
Barrière, Canada
17.7 9.9 9.6 6.2 4.2 3.7 7.6 69 51.4 6.7 9 9.7 10.2 8.7 8.2 - -
11 Canada
Coldstream, Canada
17.1 12.1 7.7 6.5 4.9 3.1 6.8 61.4 64.6 10.5 8.2 9.2 6.9 - - - -
12 Canada
Kelowna, Canada
16.7 10.6 5.1 4.4 3.5 2.5 6.7 54.5 59 9.7 6.8 10 5.5 7.7 7.1 - -
13 Canada
Nelson Kutenai Place, Canada
16.5 12.5 8.8 6.3 4.8 3 5.5 54.8 56.1 12.8 6.7 10.3 5.2 - - - -
14 Canada
Kamloops, Canada
16.1 7 5.2 3.8 3.3 2.6 5.7 81.4 60.7 5.6 4.1 6.1 4.5 5.8 6.3 - -
15 Canada
Cochrane, Canada
15.2 12.1 9.7 5.4 5.9 6 10 44.2 26 7.5 10.7 3.1 - - 7.9 - -
16 Canada
Dawson City, Canada
15.2 27.5 22.1 24 15 3.8 4.3 10.8 11.9 4.2 9.4 20.8 14.1 - - - -
17 Canada
Canmore, Canada
13.8 10.5 12.8 5.7 4.4 4.6 6.1 41 34 5.7 4.7 4.4 9.1 - - - -
18 Canada
Fort Macleod, Canada
13.5 - 8.4 5.6 3.9 5.1 6.2 37.8 30.2 10.8 4.8 4.5 6.8 - - - -
19 Canada
Cranbrook, Canada
12.9 13.6 10.9 7.1 5.8 4 6.2 32 34.6 10.4 6.8 9.6 11.1 9.7 8.9 - -
20 Canada
Simcoe, Canada
12.4 15.9 15.4 10.3 11.8 9.9 14.6 16.6 16.6 7.5 8.6 10.5 12 - - - -
21 Canada
Woodstock, Canada
12.1 13.1 12.3 10.1 9 8.8 11.5 16.7 14.7 7.5 8.4 13 14.5 - - - -
22 Canada
Didsbury, Canada
12 8 7.3 4.9 3.8 4.5 6 34.9 22.8 6.3 7.4 3.5 8.8 - 8.1 - -
23 Canada
Mont-Royal, Canada
11.7 12.2 13 10 10.9 10.9 14 14.1 13.9 7.7 10 11.3 12.3 10.5 13 - -
24 Canada
Medicine Hat - Crescent Hts, Canada
11.6 - - 6.3 4.6 4.5 4.7 29.6 22.5 9.8 7.8 4.7 7.8 - - - -
25 Canada
Lytton, Canada
11.4 10.4 7.8 5.4 3.9 3 6.6 22.6 36.1 4.9 4.8 7.8 6.9 - - - -
26 Canada
Chenier, Canada
11.4 14.2 15.1 10.7 10.3 9.8 10.8 12.1 14 8 10.6 10.1 11 - - - -
27 Canada
Valemount, Canada
11 10.7 10.8 6.2 7.8 5.2 7.9 25.5 20.7 5 7.6 6.7 16.6 8.5 - - -
28 Canada
Hamilton, Canada
11 12.7 11.9 10.3 10.9 9.2 10.5 16.2 13.9 7 8.1 9.4 11.5 9.4 10.1 8.9 8.3
29 Canada
Prince Albert, Canada
10.9 13.2 6.4 9.9 5.7 6.8 8.1 25.3 16.3 6.1 12.4 10.2 5.5 7.4 - - -
30 Canada
Camrose, Canada
10.6 - - 4.1 5.2 4.7 5.8 25.2 16.7 3.8 11 8.4 10.6 - - - -
31 Canada
Whitecourt, Canada
10.6 16.7 10.3 11.7 5.5 5.2 8.1 21.8 12.9 3.9 5.5 10.1 14.9 - - - -
32 Canada
Laval, Canada
10.6 15.8 17 9.7 6 7.1 9.7 12.7 14.4 4.9 8.9 9.5 10.8 10.1 9.4 - -
33 Canada
Otterburn Park, Canada
10.5 17 17.5 7.4 5.8 6.4 9.9 13.3 15 4.9 8.1 8.9 10.2 - - - -
34 Canada
Indian Head, Canada
10.5 13.3 7.8 8 5.1 5 5.1 21.8 20 6.9 10.9 8.6 7.9 - - - -
35 Canada
Stettler, Canada
10.4 12.6 13.3 6.1 4.3 4 4.5 26.5 18.4 4.5 4.5 6.4 9.9 - - - -
36 Canada
Qualicum Beach, Canada
10.4 14.9 16.6 14.5 7.8 3.8 7 4.3 6 6.1 13.7 14.1 12.3 12.6 10 - -
37 Canada
Montreal, Canada
10.4 12.8 13.6 9.9 9.1 8.8 10.5 12.4 13.3 5.7 9.3 8.6 10.7 9.5 10 7 6.8
38 Canada
Saskatoon, Canada
10.4 6.7 5.5 8.8 4.6 4.5 6.2 25.3 16.4 6.4 16 9.5 8.8 - 8.2 - -
39 Canada
Maple Ridge, Canada
10.3 9.6 8.4 7.8 6.4 5.7 6.8 27.9 16.6 6.1 9.9 8.4 9.2 - - - -
40 Canada
London, Canada
10.3 8.4 9.1 8.2 9.9 8.7 10.5 17 14.7 7.4 8.6 9 11.5 6.7 6.4 7.3 7.1
41 Canada
Watrous, Canada
10.3 15.1 8.2 9.2 4 4.1 5.5 20.4 17.3 5.7 13 7.9 8.1 - - - -
42 Canada
Hinton, Canada
10.1 9.3 11.8 9.5 5.9 5 7.4 28.9 18.1 4.9 6.4 6.2 6 6.6 8 - -
43 Canada
Houston, Canada
10.1 16.8 21.2 8.2 8.1 4.4 6.5 5.9 4.2 5 12.3 10.4 15.5 8.4 12.8 - -
44 Canada
Hazelton, Canada
9.9 12.5 13.4 11.2 5.3 3.4 6.3 4.4 3.1 4 11.2 12.9 22.9 10.7 13.5 - -
45 Canada
Smithers St Josephs, Canada
9.9 16.4 16.1 9 6.2 3.8 5.8 5.4 4 4.8 13.2 12.7 18.2 - - - -
46 Canada
Algoma, Canada
9.9 - 15.5 6.7 7.6 7.7 9.3 17.8 16.7 4.2 7.3 8.1 6.2 - - - -
47 Canada
Gatineau, Canada
9.9 14.7 13.2 8.7 5.7 6.9 9.5 13.5 15.6 4.2 7.3 8.1 10.8 8 7.8 - -
48 Canada
St. Albert, Canada
9.8 12.5 8.4 8.4 4.7 5.4 6.6 24.2 14.3 5.3 8.5 8.5 9.7 6.7 6.7 - -
49 Canada
Grand Forks, Canada
9.7 11.2 8.1 9 6.6 5 5.5 - 11.6 14.1 8.3 14.6 10.2 12.2 10.6 - -
50 Canada
Mississauga, Canada
9.7 8.7 8.5 8.3 8.3 8.9 11.1 14.7 13.7 6.4 7.8 9.4 9.6 6.9 6.9 7.4 7.2
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