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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 120 |  Wuhan, China | 46.7 | 67.7 | 50.6 | 47.7 | 45.6 | 39.1 | 35.6 | 24.4 | 27.7 | 30.9 | 43.6 | 61.3 | 85.9 | 36.5 | 44.4 | 46.9 | 51 |
| 815 |  Milano, Italy | 22.9 | 34.3 | 36.4 | 28.8 | 18.9 | 9.4 | 15.2 | 12.7 | 10.9 | 16.6 | 25.5 | 19.7 | 45.9 | 28.4 | 23.3 | 22.1 | 27.8 |
| 1370 | Bergamo, Italy | 17.6 | 27.4 | 33 | 26.5 | 15.3 | 6 | 9.4 | 8 | 7 | 11.7 | 20.6 | 17.2 | 30.9 | 17.8 | 18.5 | 18 | 26.4 |
| 3978 |  Madrid, Spain | 9.4 | 13.2 | 10.3 | 10.7 | 7.8 | 6.7 | 9.2 | 10.4 | 12.1 | 8.9 | 8.4 | 6.3 | 9 | 9 | 9.2 | 10 | 9.9 |
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