World's most polluted cities (historical data 2017-2022)
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
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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 | 2022 | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Santana de Mures, Romania | 29.7 | 61.7 | - | - | - | 15.6 | 13.2 | 12.9 | 15.5 | 13.2 | 34.2 | 51.1 | 57.2 | 28.3 | - | - | - | - |
| 2 | Ojdula, Romania | 28.1 | 42.8 | 43.6 | 41.6 | 22.5 | 15.6 | 12.8 | 13.7 | 16.3 | 14.6 | 28.5 | 41.9 | 50.3 | 30.3 | - | - | - | - |
| 3 | Cluj-Napoca, Romania | 26.4 | 40.7 | 35.4 | 38.3 | 19.4 | 15.4 | 13.5 | 12.5 | 15.1 | 14.7 | 29.7 | 39.8 | 42.3 | 20.1 | 13.1 | 15.7 | 21.4 | - |
| 4 | Popricani, Romania | 23.2 | 27.1 | 29.2 | 37.8 | 20.9 | 11.5 | 11.9 | 11.4 | 16.9 | 12.5 | 21.8 | 39.7 | 40.7 | 31 | - | - | - | - |
| 5 | Targu-Mures, Romania | 22.9 | 38.6 | 36.4 | 29.4 | 13.9 | 9 | 8.8 | 10.8 | 13.9 | 11.9 | 30.4 | 41.1 | 44.5 | 22.3 | 15.1 | - | - | - |
| 6 | Modelu, Romania | 20.5 | 19.9 | 26.1 | 23.6 | 10.4 | 8.3 | 8.8 | 13.8 | 57.9 | 17 | 23.7 | 28.2 | 23.3 | 21 | 20.1 | - | - | - |
| 7 | Popesti-Leordeni, Romania | 19.7 | 25.4 | - | - | 16.4 | 13.3 | 14.2 | 12.8 | 14.5 | 13 | 24.1 | 36.5 | 30.5 | - | - | - | - | - |
| 8 | Bucuresti, Romania | 19.2 | - | - | - | 14 | 10.7 | 13.7 | 13.4 | 15.3 | 14.4 | 24.1 | 35.2 | 30.8 | - | - | - | - | - |
| 9 | Mogosoaia, Romania | 19.1 | - | - | - | 16.9 | 11.6 | 12.2 | 12.2 | 13.1 | 12.1 | 25.2 | 35.8 | 32 | - | - | - | - | - |
| 10 | Otopeni, Romania | 19 | 29.1 | 31.2 | 29.9 | 15.3 | 9.7 | 9.7 | 9.1 | 10.3 | 8.3 | 17.9 | 30.7 | 27 | 25.8 | - | - | - | - |
| 11 | Craiova, Romania | 18.4 | 19.6 | 26.5 | 28.3 | 10 | 7.8 | 11.5 | 12.1 | 11.6 | 10.3 | 20.7 | 30 | 34 | 21 | - | - | - | - |
| 12 | Radauti, Romania | 17.7 | 15.2 | 16.4 | 24.2 | 15.3 | 7.9 | 8.4 | 9 | 12 | 10.8 | 24 | 40.7 | 29.4 | 20.3 | - | - | - | - |
| 13 | Miercurea-Ciuc, Romania | 17.3 | 30.2 | 33.1 | 29.2 | 14.1 | 11.7 | 8.8 | 8.4 | 10.7 | 8.9 | 20.3 | - | - | - | - | - | - | - |
| 14 | Iasi, Romania | 17.3 | 17.8 | 23.8 | 26.9 | 13.8 | 10.3 | 8.6 | 9.8 | 18.9 | 13.1 | 19.8 | 20.7 | 24.6 | 20.6 | - | 22.4 | 27 | - |
| 15 | Bucharest, Romania | 17.1 | 13.9 | 19.8 | 19.2 | 12.3 | 9.9 | 11.4 | 11.3 | 13 | 10.2 | 20.9 | 33.8 | 29.2 | 14.9 | 15.5 | 18.4 | 20.3 | - |
| 16 | Magurele, Romania | 16.5 | 19.5 | 26.3 | 20.4 | 12.9 | 11.5 | 11.6 | 11.4 | 12.3 | 11.4 | 17.2 | 22.9 | 21.6 | 15.5 | - | 15.7 | 18.9 | - |
| 17 | Brasov, Romania | 16.4 | 17.4 | 22.9 | 24.3 | 10.3 | 9.4 | 9.8 | 10.8 | 12.3 | 8.7 | 17.6 | 34.2 | 31.7 | 17.3 | 18.3 | 18 | 21.3 | - |
| 18 | Slatina, Romania | 14.9 | 14.7 | 20.9 | 18.8 | 12.2 | 13.3 | 12.5 | 12.3 | 13.4 | 9 | 14.6 | 22.6 | 19.4 | 14.1 | - | - | - | - |
| 19 | Timisoara, Romania | 13.9 | 18.7 | 11 | 17.5 | 10.4 | 8.4 | 7.6 | 8.6 | 10.1 | 8.8 | 16.4 | 27.2 | 20.5 | 14.3 | - | - | - | - |
| 20 | Caciulati, Romania | 13.2 | 17.7 | 21.2 | 18.8 | 10.7 | 8 | 8.5 | 10.5 | 9.2 | 6.9 | 11.5 | 17.2 | 19.4 | 15.4 | - | - | - | - |
| 21 | Holboca, Romania | 13.1 | 14 | 18.6 | 22.8 | 11.6 | 8.3 | 8.6 | 7.1 | 8.9 | 5.7 | 13.6 | 20.7 | 21.7 | - | - | - | - | - |
| 22 | Drobeta-Turnu Severin, Romania | 12.7 | 17.9 | 14.7 | 23.5 | 9.8 | 8.7 | 8.1 | 7.4 | 7.5 | 7.3 | 11.1 | 16.5 | 18 | 20 | 12.7 | - | - | - |
| 23 | Sibiu, Romania | 12.4 | 11.4 | 10.2 | 17.1 | 8 | 4.6 | 5.5 | 8.9 | 12.4 | 12.2 | 17.5 | 27.2 | 30.4 | 9.7 | - | - | - | - |
| 24 | Arad, Romania | 12.3 | 24.4 | 14.6 | 22.4 | 13.8 | 7 | 6.4 | 7.9 | 9.6 | 8.1 | 11.6 | 15.3 | 15 | 16.3 | - | - | - | - |
| 25 | Satu Mare, Romania | 12.3 | 21.9 | 12.1 | 21.4 | 8.5 | 9.8 | 6.7 | 5.6 | 7 | 7.3 | 13.4 | 20.8 | 23.7 | 15.3 | - | - | - | - |
| 26 | Scheia, Romania | 11.4 | 8.1 | 12.4 | 17.5 | 11 | 9.8 | 9.7 | 11.4 | 8.9 | 7.2 | 11.2 | 17.3 | 18 | 15.3 | 15 | - | - | - |
| 27 | Constanta, Romania | 11.3 | 11.6 | 15.1 | 16.2 | 13.7 | 10.4 | 10.3 | 7.7 | 10.8 | 7.7 | 9.4 | 11.6 | 6 | 12.1 | - | - | - | - |
| 28 | Aroneanu, Romania | 11 | - | 14.9 | 19.6 | 11.1 | 6.8 | 7 | 7.7 | 10.6 | 6.6 | 9.8 | 14 | 16.3 | - | - | - | - | - |
| 29 | Galati, Romania | 8.5 | 8.1 | 8.2 | 10.5 | 7.6 | 7.1 | 8.2 | 7.2 | 6.8 | 8.9 | 11 | 10 | 18 | 7 | - | - | - | - |
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