World's most polluted cities 2020 (PM2.5)
The most polluted cities according to data aggregated from over 80,000 data points.
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2020
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World air quality report
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2020 Report - English
2020 World air quality report
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PM2.5 Legend 
WHO target
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
Unit: µg/m³
| Rank | City | 2020 AVG | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2019 AVG | 2018 AVG | 2017 AVG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Modelu, Romania | 20.1 | 48.1 | 28.9 | 30.3 | 12.7 | 9.9 | 14.4 | 16.2 | 11.1 | 12.6 | 16.6 | 26.2 | 22.1 | - | - | - |
| 2 | Calafat, Romania | 18.6 | 36.9 | 23.3 | 24.4 | 14.1 | 8.1 | 9.8 | 16.3 | 12.6 | 15.8 | 18.9 | 24.8 | 21.3 | - | - | - |
| 3 | Brasov, Romania | 18.3 | 61.5 | 21.5 | 17 | 14.4 | 7.1 | 8.2 | 9.1 | 9.7 | 10.9 | 16.9 | 34.4 | 21.8 | 18 | 21.3 | - |
| 4 | Branistea, Romania | 18 | 35 | 20.2 | 19.9 | 14.2 | 9.1 | 11.3 | 13.8 | 10.5 | 17.2 | 19.3 | 23.6 | - | 25.9 | 16.8 | - |
| 5 | Bucharest, Romania | 15.5 | 29.9 | 17.5 | 18.9 | 13.9 | 8.6 | 12 | 9.2 | 10.4 | 11.7 | 16.7 | 21.2 | 16 | 18.4 | 20.3 | - |
| 6 | Targu-Mures, Romania | 15.1 | 36.6 | 20.2 | 15 | 13.8 | 6.8 | 5.2 | 6.7 | 7.3 | 9.9 | 17.2 | 29.7 | 27.3 | - | - | - |
| 7 | Scheia, Romania | 15 | 24.3 | 13.5 | 19 | 15.3 | 8.2 | 8.3 | 11.4 | 12.1 | 11.1 | 12.7 | 21.4 | 16.5 | - | - | - |
| 8 | Cluj-Napoca, Romania | 13.1 | 22.5 | 16.1 | 13.8 | 14.1 | 7.7 | 9.1 | 8.6 | 12.6 | 7.5 | 14 | 14.8 | - | 15.7 | 21.4 | - |
| 9 | Drobeta-Turnu Severin, Romania | 12.7 | 19.2 | 11.8 | 10.1 | 9.9 | 8.8 | 9.3 | 8.1 | 6.1 | 15.7 | 16.3 | 19.7 | 19.8 | - | - | - |
| 10 | Baia Mare, Romania | 12.5 | 34.2 | 13.3 | 12.8 | 13.3 | 7.8 | 8.6 | 8.3 | 9.2 | 7.7 | 10.4 | 16.6 | 18.3 | 11.9 | - | - |
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