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2017-2023
World's most polluted cities
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
2023
World Air Quality Report
PM2.5 legend
0-5
Meets WHO guideline
5.1-10
Exceeds by 1 to 2 times
10.1-15
Exceeds by 2 to 3 times
15.1-25
Exceeds by 3 to 5 times
25.1-35
Exceeds by 5 to 7 times
35.1-50
Exceeds by 7 to 10 times
>50.1
Exceeds by over 10 times
Rank | City | 2023 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Grimshaw, Canada | 27.5 | -- | -- | -- | -- | 53.1 | 27.4 | 38.9 | 34.7 | 55.6 | 9.5 | 11.1 | 5 | -- | -- | -- | -- | -- | -- |
| 2 | Fort Mckay, Canada | 23.8 | 9.1 | 5.7 | 8.7 | 6.2 | 43.4 | 33.9 | 50.5 | 44.7 | 62.6 | 7.7 | 6.4 | 5.2 | 6.3 | 5.6 | -- | -- | -- | -- |
| 3 | Fort McMurray, Canada | 22.8 | 9.7 | 5.8 | 6.6 | 6.1 | 48.7 | 30.8 | 46.1 | 44.4 | 52.7 | 7.6 | 5.7 | 4.1 | 7.5 | 7 | 5.4 | 6.4 | -- | -- |
| 4 | Peace River, Canada | 22.4 | 18.9 | 4.8 | 5.3 | 3.8 | 61.3 | 31.9 | 33.8 | 28 | 45.2 | 7.9 | 8.1 | 5.8 | 7.1 | 6.3 | -- | -- | -- | -- |
| 5 | Fort Vermilion, Canada | 22.3 | 6.3 | 1.6 | 2 | 2.7 | 30 | 35 | 49.5 | 46.2 | 49.1 | 10.2 | 12.1 | 6.6 | -- | -- | -- | -- | -- | -- |
| 6 | Timberlea, Canada | 21.4 | 9.4 | 5 | 6.2 | 5.4 | 44.2 | 22.5 | 46.8 | 40.9 | 55.7 | 6 | 5.8 | 5.6 | -- | -- | -- | -- | -- | -- |
| 7 | Conklin, Canada | 19.4 | 8.2 | 3.2 | 4.7 | 5.2 | 49 | 27.9 | 36.3 | 33 | 47.5 | 7.1 | 5.5 | 4.3 | 6.3 | 6.5 | 4.6 | 5.7 | -- | -- |
| 8 | Fort Chipewyan, Canada | 19.2 | 3.9 | 2.2 | 3.6 | 3.2 | 20.9 | 27.9 | 35.3 | 58.4 | 47.1 | -- | -- | 2.9 | 4.9 | 4.4 | 3.8 | 5.6 | 4.9 | 3.6 |
| 9 | Bonnyville, Canada | 18.6 | 17.2 | 5.6 | 10 | 6.6 | 24.7 | 26.1 | 29.5 | 23.5 | 24.4 | 8.3 | -- | -- | 8.5 | 9.1 | 4.9 | 5.5 | -- | -- |
| 10 | Beaumont, Canada | 17.7 | 23.9 | 8.2 | 14.5 | 8.7 | 36.1 | 20.7 | 28.2 | 20 | 29.3 | 5.5 | 8 | 5.7 | 12.5 | -- | -- | -- | -- | -- |
| 11 | Wabasca-Desmarais, Canada | 17.5 | -- | -- | -- | 4.2 | 29.3 | 22.9 | 31.9 | 24.6 | 23.7 | 3.9 | 4.3 | 2.6 | 5.6 | 7.6 | -- | -- | -- | -- |
| 12 | Fort Saskatchewan, Canada | 16.8 | 17.9 | 6.2 | 10.7 | 7.2 | 35.9 | 21.9 | 31.4 | 19.3 | 28.3 | 7.1 | 9.2 | 7.8 | 7.4 | 8.2 | 5.8 | 7.5 | 11.6 | 7.9 |
| 13 | Redwater, Canada | 16.8 | 14.2 | 5.1 | 9.7 | 6.4 | 34 | 23.4 | 35.2 | 19.5 | 33.3 | 5.8 | 8 | 6.3 | 7.6 | 8.5 | 5.5 | 7.9 | -- | -- |
| 14 | Spruce Grove, Canada | 16.8 | 17.7 | 6 | 10 | 3.7 | 33.7 | 20.6 | 28.8 | 21.2 | 29.5 | 4 | 5.5 | 2.8 | 7.3 | 9.6 | 7.2 | 9.8 | -- | -- |
| 15 | Edmonton, Canada | 16.6 | 21 | 7 | 12 | 7.2 | 32.2 | 20.3 | 28.1 | 20.4 | 30 | 5.6 | 7.9 | 6 | 8.7 | 9.5 | 6.5 | 7.4 | 10.5 | 8.2 |
| 16 | Athabasca, Canada | 16.5 | 17.7 | 4.4 | 7.3 | 6.2 | 32.2 | 25.1 | 35.5 | 22.1 | 24.8 | 4.7 | 7.8 | 5.5 | 7.3 | 9.4 | -- | -- | -- | -- |
| 17 | Gibbons, Canada | 16.3 | 16.7 | 7.3 | 12 | 8.6 | 23.7 | 21.2 | 30 | 18.3 | 35.5 | 7.2 | 8.8 | 7.2 | 9.6 | 9.5 | 7.7 | 8.7 | -- | -- |
| 18 | Devon, Canada | 16.2 | 22.8 | 7.6 | 13.4 | 8.1 | 32.7 | 19.9 | 25 | 19.4 | 23.1 | 5.3 | 7.9 | 5 | 6.1 | 9.3 | -- | -- | -- | -- |
| 19 | Nampa, Canada | 16.2 | 14.5 | 3.3 | 3.9 | 3.1 | 45 | 30 | 18.3 | 36.5 | 24.5 | 6.7 | 6.9 | 2.8 | -- | -- | -- | -- | -- | -- |
| 20 | St. Albert, Canada | 15.8 | 20.4 | 6.2 | 10.8 | 6.7 | 31.9 | 19.3 | 25.3 | 18.8 | 28.7 | 6.1 | 8 | 6.1 | 8.5 | 9.8 | 6.7 | 6.7 | -- | -- |
| 21 | Sherwood Park, Canada | 15.7 | 18.3 | 5.7 | 10.6 | 7.3 | 30.3 | 19.4 | 29.3 | 19.7 | 30 | 5 | 6.9 | 4.7 | 7.1 | 8.5 | 6.3 | 8 | -- | -- |
| 22 | Wainwright, Canada | 15.7 | 18.3 | 7.6 | 10.7 | 6 | 28 | 20.5 | 38.7 | 24.6 | 22 | 6 | 8.5 | 7.8 | 8.1 | 12.2 | -- | -- | -- | -- |
| 23 | Anzac, Canada | 15.4 | 5.6 | 3.6 | 4.4 | 3.9 | 20 | 28.6 | 38.3 | 25.5 | 43.5 | -- | -- | 3.1 | 5.5 | 5.8 | 4.5 | 5.9 | -- | -- |
| 24 | Camrose, Canada | 15.3 | 18.7 | 7.8 | 13.2 | 7.6 | 25.6 | 20.2 | 18.5 | 21.7 | 30.1 | 4.9 | 7.5 | 5.5 | 7.9 | 10.6 | -- | -- | -- | -- |
| 25 | Carrot Creek, Canada | 15.3 | 24.9 | 3.5 | 7.4 | 3.9 | 36.1 | 22.3 | 25.5 | 20.2 | 18.8 | 4.6 | 6 | 4.6 | 8.3 | 7.1 | -- | -- | -- | -- |
| 26 | Lamont, Canada | 15.3 | 13 | 4.8 | 9.1 | 5.9 | 30.2 | 19.8 | 32.5 | 17.4 | 25.7 | 6.6 | 8 | 7.2 | -- | -- | -- | -- | -- | -- |
| 27 | Bruderheim, Canada | 14.9 | 14.8 | 5.9 | 9.6 | 6.3 | 33.7 | 18.8 | 27.9 | 15.9 | 25.2 | 6.2 | 7.7 | 6.9 | 7.4 | 8.4 | 6.1 | 7.7 | 10.7 | 7 |
| 28 | Waskatenau, Canada | 14.9 | 19.1 | 7.5 | 10.7 | 7.5 | 27 | 15.1 | 29.1 | 19 | 21.8 | 4.8 | 7.7 | 5.8 | -- | -- | -- | -- | -- | -- |
| 29 | Cold Lake, Canada | 14.8 | 10.2 | 4.2 | 5.9 | 5.2 | 30.2 | 22.6 | 25.2 | 21.2 | 34.4 | 4.6 | 6.7 | 6.2 | 7.1 | 8.1 | 4.9 | 4.4 | -- | -- |
| 30 | Leduc, Canada | 14.8 | 10.7 | 4.8 | 10.2 | 5.4 | 34.9 | 19.2 | 25.7 | 17.1 | 29.2 | 5.8 | 8.3 | 5.2 | 7.9 | 12.9 | -- | -- | -- | -- |
| 31 | Elk Island, Canada | 14.6 | 13.2 | 4 | 7.9 | 5.8 | 33.2 | 20.3 | 31.1 | 16.8 | 26 | 5.4 | 6.4 | 4.5 | -- | -- | -- | -- | -- | -- |
| 32 | Janvier, Canada | 14.3 | 7.4 | 3.2 | 4.5 | 4.7 | 30.5 | 25.9 | 31.3 | 26.9 | 25.7 | 4.8 | 4.7 | 3.6 | -- | -- | -- | -- | -- | -- |
| 33 | Smoky Heights, Canada | 14.3 | 9.1 | 2.2 | 4.5 | 3.9 | 51.7 | 20.6 | 24.3 | 19.9 | 21.8 | 5.2 | 6.2 | 5.3 | -- | -- | -- | -- | -- | -- |
| 34 | Patricia Mcinnes, Canada | 14.2 | 5.2 | 2.9 | 4 | 4.9 | 20.3 | 24.3 | 31.9 | 28.5 | 49 | -- | -- | 2.2 | 5.9 | 5.3 | -- | -- | -- | -- |
| 35 | Bassano, Canada | 14.1 | 8.8 | 7.6 | 13 | 5.8 | 18.7 | 19.5 | 36.4 | 20.5 | 23.1 | 4.8 | 6.8 | 3.3 | 7.7 | -- | -- | -- | -- | -- |
| 36 | Vauxhall, Canada | 14.1 | 8 | 11.3 | 10.5 | 3.9 | 22.5 | 16.1 | 25.4 | 19.9 | 18 | 3.6 | 5.3 | 18 | 7.8 | -- | -- | -- | -- | -- |
| 37 | Hinton, Canada | 13.9 | 7.8 | 5.3 | 7.8 | 4.1 | 47.1 | 18.5 | 21.8 | 17 | 20.3 | 4.9 | 5.6 | 4.8 | 7.8 | 10.1 | 6.6 | 8 | -- | -- |
| 38 | Red Deer, Canada | 13.7 | 6.3 | 3.5 | 9.8 | 4.9 | 30.3 | 15.8 | 22.6 | 17.4 | 25.8 | 6.7 | 7.4 | 6.1 | 5.9 | 6.1 | 4.8 | 6.3 | 9.7 | 7 |
| 39 | Beaverlodge, Canada | 13.6 | 8.7 | 2.6 | 5.1 | 3.1 | 36.5 | 19 | 28.9 | 19.3 | 23.4 | 5.3 | 6.3 | 3.7 | 4.9 | 5.1 | 4.7 | 6.8 | 8.1 | 5.6 |
| 40 | Lac La Biche, Canada | 13.2 | 10.6 | 2.7 | 5.5 | 6.1 | 28.1 | 21.5 | 21.3 | 18.5 | 27.4 | 4 | 5.7 | 4.9 | 6 | 8.2 | -- | -- | -- | -- |
| 41 | Castor, Canada | 13 | 14.1 | 7.3 | 12.6 | 5.7 | 23.5 | 15 | 26.7 | 16.4 | 17.2 | 4.3 | 6.1 | 3.6 | -- | -- | -- | -- | -- | -- |
| 42 | Grande Prairie, Canada | 13 | 13.8 | 3.4 | 4.9 | 2.9 | 20 | 26.4 | 30.2 | 20.9 | 16.2 | 4 | 5.4 | 5.7 | 5.2 | 6.7 | 5.6 | 7.6 | -- | -- |
| 43 | Grande Cache, Canada | 12.6 | 0.9 | 2.4 | 3.6 | 2.8 | 25.2 | 13.9 | 29.4 | 19.6 | 22.6 | 2.9 | 2.8 | 2.4 | 4.8 | 12.3 | -- | -- | -- | -- |
| 44 | High River, Canada | 12.2 | -- | -- | -- | -- | 23.8 | 20.9 | 14.1 | 14.1 | 17.1 | 4 | 4.2 | 4.8 | -- | -- | -- | -- | -- | -- |
| 45 | Ardrossan, Canada | 11.8 | 8.1 | 3.7 | 6.2 | 4.5 | 30.4 | 15.4 | 28.1 | 12.6 | 20.3 | 3.3 | 4.2 | 3.7 | 5.5 | 7 | 5 | 6.2 | -- | -- |
| 46 | Calgary, Canada | 11.7 | 4.2 | 4.7 | 10.6 | 4.6 | 27.6 | 13.9 | 22.7 | 20.7 | 16 | 4.9 | 5.2 | 4.5 | 6.3 | 8.4 | 5.9 | 6.9 | 10.9 | 7.5 |
| 47 | Medicine Hat, Canada | 11.7 | 6.4 | 4.7 | 12.2 | 3.5 | 18.1 | 14.2 | 22.4 | 18.1 | 19.4 | 5.3 | 6.3 | 3.1 | 5.1 | 6.6 | 5.2 | 5 | 7.1 | 5.9 |
| 48 | Tomahawk, Canada | 11.7 | 18.2 | 5.6 | 8.5 | 5.5 | 12.6 | 19.3 | 21.9 | 17.6 | 19.5 | 4.4 | 5.4 | 3.5 | 6.3 | 6.5 | 4.7 | 5.8 | 8.8 | 5.8 |
| 49 | Alberta Beach, Canada | 11.2 | 13.6 | 4.2 | 6.7 | 4 | 33.2 | 13.9 | 19 | 13.9 | 13.7 | 4.6 | 5 | 3.7 | 5.4 | 6.4 | 5 | 6.1 | -- | -- |
| 50 | Didsbury, Canada | 11.2 | 6.5 | 7.5 | 10.3 | 5.2 | 29.3 | 17.6 | 22.4 | 21.2 | 17.1 | 4.1 | 4.3 | 4.3 | 6.4 | 12 | -- | 8.1 | -- | -- |
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