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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2021 Report - English
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
Rank  | City | 2021 | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  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 | Lumby, Canada | 25.9 | - | - | 15.1 | 8.4 | 5 | 4.7 | 197.3 | 84.8 | 15.1 | 14.8 | 22.1 | 20 | - | - | - | - |
| 3 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | Camrose, Canada | 10.6 | - | - | 4.1 | 5.2 | 4.7 | 5.8 | 25.2 | 16.7 | 3.8 | 11 | 8.4 | 10.6 | - | - | - | - |
| 31 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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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