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 |  Ojdula, Romania | 30.3 | 48.6 | 49.5 | 41.4 | 30.2 | 13.9 | 16.9 | 16.4 | 15.3 | 19.1 | 33.4 | 40.4 | 40.6 | - | - | - | - |
| 2 | Otopeni, Romania | 25.8 | 43.7 | 39.3 | 33.4 | 25.7 | 12.8 | 13.4 | 17.1 | 16.7 | 14.7 | 27.9 | 35.5 | 28.8 | - | - | - | - |
| 3 | Targu-Mures, Romania | 22.3 | 33.7 | 32.1 | 28.5 | 17.7 | 9.8 | 13.7 | 12.3 | 12.4 | 14.9 | 28.1 | 35 | 30.2 | 15.1 | - | - | - |
| 4 | Modelu, Romania | 21 | 21.9 | 27.6 | 22.6 | 21.6 | 8.2 | 22.7 | 76.2 | 12.1 | 13.1 | 20.1 | 22.6 | 20.6 | 20.1 | - | - | - |
| 5 | Craiova, Romania | 21 | 25.1 | 29.7 | 21.1 | 20.3 | 11.7 | 16.1 | 14.4 | 15.5 | 21.8 | 23.8 | 28.3 | 23.8 | - | - | - | - |
| 6 | Iasi, Romania | 20.6 | 26.7 | 30.6 | 25.5 | 19.3 | 13.3 | 17.5 | 15.3 | 12.1 | 17.2 | 25 | 24.5 | 21.1 | - | 22.4 | 27 | - |
| 7 | Radauti, Romania | 20.3 | 33.5 | 40.9 | 21.8 | 18.3 | 7.2 | 10.1 | 12.6 | 9.8 | 12.1 | 21 | 29 | 27.5 | - | - | - | - |
| 8 | Cluj-Napoca, Romania | 20.1 | 16.3 | 18.9 | 13.2 | 10 | 9 | 14.6 | 19.8 | 16.3 | 19.6 | 31.4 | 40.5 | 31.8 | 13.1 | 15.7 | 21.4 | - |
| 9 | Drobeta-Turnu Severin, Romania | 20 | 22.9 | 22.1 | 16.9 | 13.6 | 9 | 11.4 | 14 | 15.1 | 17 | 31.3 | 43.9 | 23.9 | 12.7 | - | - | - |
| 10 | Brasov, Romania | 17.3 | 30.7 | 30 | 19.1 | 11.9 | 7 | 9.5 | 12.5 | 10.9 | 11.2 | 18 | 25.6 | 22.4 | 18.3 | 18 | 21.3 | - |
| 11 | Valeni, Romania | 17.3 | 22.3 | 22.4 | 18.1 | 13.4 | 9.4 | 9.9 | 14.2 | 12.2 | 19.4 | 28.3 | 21 | 18.2 | - | - | - | - |
| 12 | Ploiesti, Romania | 17.2 | 24.2 | 25.7 | 17.8 | 15 | 11.6 | 11.8 | 15.8 | 14.5 | 12.1 | 19 | 24.4 | 19.2 | - | - | - | - |
| 13 | Turnu Magurele, Romania | 17 | 14.5 | 27.5 | 18.6 | 12.6 | 12.3 | 11.2 | 21.3 | 14.2 | 19.3 | 17.9 | 21.9 | 8.6 | - | - | - | - |
| 14 | Ramnicu Valcea, Romania | 17 | 24.6 | - | 17.8 | 17.5 | 8.4 | 8.2 | 9.5 | 9.7 | 10.2 | 14.5 | 29.7 | 24.5 | - | - | - | - |
| 15 | Arad, Romania | 16.3 | 19.6 | 28 | 19.1 | 13.5 | 7.9 | - | 11.6 | 10.9 | 11 | 19.7 | 20.2 | 13.8 | - | - | - | - |
| 16 | Magurele, Romania | 15.5 | 17.7 | 19.7 | 15.7 | 12.6 | 9.8 | 11.4 | 12.8 | 12.9 | 11.8 | 18 | 23.2 | 21 | - | 15.7 | 18.9 | - |
| 17 | Caciulati, Romania | 15.4 | 23.3 | 24.7 | 19.9 | 14.7 | 9.1 | 8.3 | 11.6 | 11 | 9.4 | 15.3 | 20.8 | 16.8 | - | - | - | - |
| 18 | Baia Mare, Romania | 15.3 | 25 | 30.5 | 23.1 | 14.6 | 7.9 | 10 | 10.5 | 8.6 | 9.5 | 14.1 | 20.6 | 21.5 | 12.5 | 11.9 | - | - |
| 19 | Satu Mare, Romania | 15.3 | 17.8 | 24.8 | 20.6 | 12.3 | 7.7 | 14.3 | 15.1 | 9 | 10.6 | 19.3 | 21.1 | 22.4 | - | - | - | - |
| 20 | Scheia, Romania | 15.3 | 22 | 25.7 | 12.8 | 11.2 | 4.7 | 11.2 | 13.1 | 9.3 | 10.2 | 16.8 | 20.1 | 8.9 | 15 | - | - | - |
| 21 | Bucharest, Romania | 14.9 | 17.9 | 19.2 | 16.9 | 12.6 | 9.9 | 12.1 | 13.3 | 12.6 | 11.2 | 15.8 | 19.5 | 17.9 | 15.5 | 18.4 | 20.3 | - |
| 22 | Zimnicea, Romania | 14.9 | 18.3 | 19.1 | 13.3 | 12.4 | 9.2 | 10.2 | 15.9 | 11.7 | 16 | 18.3 | 20 | 6.8 | - | - | - | - |
| 23 | Branistea, Romania | 14.8 | 19.5 | 15.3 | 20 | 11.6 | 7.3 | 9.7 | 11.5 | 11 | 14.1 | 20.8 | 21.3 | 6 | 18 | 25.9 | 16.8 | - |
| 24 | Pitesti, Romania | 14.4 | 22.3 | 20.3 | 19.1 | 13.5 | 10.5 | 12.1 | 11.4 | 12.7 | 9.4 | 12.7 | 14.9 | 20.6 | - | - | - | - |
| 25 | Timisoara, Romania | 14.3 | 14.9 | 20.5 | 12.8 | 18.1 | 10.5 | 12.3 | 15.4 | 13.1 | 11.2 | 13.6 | 16.2 | 19.7 | - | - | - | - |
| 26 | Botosani, Romania | 13.9 | 16.6 | 17.4 | 11.5 | 11.6 | 8.2 | 12 | 13.8 | 10.4 | 9.9 | 16.7 | 23.4 | 13.8 | - | 13.3 | 14.8 | - |
| 27 | Buzau, Romania | 13.8 | 24 | 24.3 | 19 | 13.4 | 9.6 | 10.5 | 8.1 | 8.4 | 7.1 | 11.3 | 16.8 | 15.3 | - | - | - | - |
| 28 | Bacau, Romania | 13.2 | 17.1 | 15.4 | 14.1 | 12.3 | 7.2 | 9.6 | 9.5 | 11 | 9 | 15.1 | 15.3 | 16.8 | - | - | - | - |
| 29 | Constanta, Romania | 12.1 | 12.3 | 18.1 | 14.3 | 11 | 9.4 | 9.9 | 12.6 | 9.3 | 11.3 | 13.4 | 11.3 | 9.3 | - | - | - | - |
| 30 | Sibiu, Romania | 9.7 | 14.7 | 22.9 | 13.9 | 8.3 | 5.3 | 6 | 9.6 | 7.6 | 8.1 | 9.9 | 9.2 | 11.4 | - | - | - | - |
| 31 | Oradea, Romania | 9.6 | 12.3 | 17.6 | 11.1 | 8 | 5.3 | 4.3 | 5.8 | 3.9 | 4.4 | 5.7 | 22.3 | 8.7 | - | - | - | - |
| 32 | Braila, Romania | 9.3 | 9.9 | 17.4 | 15.7 | 8.3 | 6 | 9.7 | 9.7 | 5.7 | 6.5 | 11.4 | 7.6 | 5.9 | - | - | - | - |
| 33 | Galati, Romania | 7 | 11 | 9.1 | 4.5 | 3.5 | 8.1 | 6.1 | 5.3 | 6.9 | 7.1 | 7.6 | 8 | 9.1 | - | - | - | - |
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