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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 |  Santana de Mures, Romania | 24 | 36.9 | 41.6 | 27.1 | 16.4 | 12.6 | 10.9 | 12.4 | 13.9 | 14.1 | 22.4 | 22.2 | 52.7 | 29.7 | 28.3 | -- | -- | -- | -- |
| 2 | Ojdula, Romania | 21.9 | 35.4 | 39.5 | 29.7 | 22.5 | 15.7 | 12.7 | 13.9 | 15.1 | 14.9 | 17.5 | 17.4 | 36.1 | 28.1 | 30.3 | -- | -- | -- | -- |
| 3 | Popricani, Romania | 20.8 | 31.7 | 29.2 | 28.2 | 23.3 | 14.7 | 13.4 | 14.2 | 15.7 | 15.5 | 11.5 | 17.1 | 34.2 | 23.2 | 31 | -- | -- | -- | -- |
| 4 | Cluj-Napoca, Romania | 18.7 | 29 | 31.1 | 23 | 16.4 | 14 | 11.9 | 13.6 | 14.4 | 14.4 | 15 | 16 | 26.4 | 26.4 | 20.1 | 13.1 | 15.7 | 21.4 | -- |
| 5 | Rudeni, Romania | 18.4 | 39.4 | -- | 24.6 | 19.1 | 10.9 | 11 | 14.1 | 13.9 | 13.8 | 20.4 | 21.2 | 40.7 | -- | -- | -- | -- | -- | -- |
| 6 | Suceava, Romania | 18.1 | 18.2 | 22.8 | 22.3 | 14.7 | 14 | 13.6 | 11.5 | 19.8 | 17.3 | 14.3 | 16.5 | 28.2 | -- | -- | -- | -- | -- | -- |
| 7 | Glina, Romania | 17.9 | 23.8 | 31.2 | 23.7 | 14.8 | 10.4 | 11.4 | 14.2 | 12.2 | 12.1 | 17.7 | 16 | 28.6 | 29.8 | -- | -- | -- | -- | -- |
| 8 | Mogosoaia, Romania | 17.7 | 25.3 | 30.4 | 23.9 | 18.6 | 11.8 | 9.9 | 12.3 | 12.9 | 9.1 | 13 | 12.6 | 29.4 | 19.1 | -- | -- | -- | -- | -- |
| 9 | Voluntari, Romania | 17.5 | 24.7 | 30.5 | 22.8 | 15.4 | 9.7 | 9.3 | 11.1 | 11.1 | 10.5 | 16.8 | 17.2 | 33.6 | 30.1 | -- | -- | -- | -- | -- |
| 10 | Chitila, Romania | 17.1 | 25.8 | 32.9 | 22.8 | 15.2 | 9.2 | 8.7 | 10.1 | 9.8 | 8.9 | 12.5 | 12.7 | 39.8 | 27.7 | -- | -- | -- | -- | -- |
| 11 | Popesti-Leordeni, Romania | 16.8 | 22.7 | 26.9 | 22.6 | 15.7 | 12.1 | 11.5 | 13 | 12.5 | 12.2 | 15.3 | 13.2 | 24 | 19.7 | -- | -- | -- | -- | -- |
| 12 | Buftea, Romania | 16.7 | 23.2 | 28.6 | 21.7 | 18.7 | 11.3 | 10.5 | 12.9 | 13.1 | 9.5 | 11.6 | 13.4 | 26.3 | 20.6 | -- | -- | -- | -- | -- |
| 13 | Jilava, Romania | 16.4 | 20.4 | 26.7 | 25.3 | 19.1 | 12.2 | 11.9 | 12.8 | 13 | 10.8 | 14.4 | 12.3 | 25.3 | 26.5 | -- | -- | -- | -- | -- |
| 14 | Chiajna, Romania | 16.2 | 25.1 | 27.1 | 22.3 | 18.5 | 12 | 11.1 | 13.4 | 11.9 | 9.2 | 13.4 | 12 | 21.4 | 28.1 | -- | -- | -- | -- | -- |
| 15 | Bucuresti, Romania | 16.1 | 25.5 | 25.7 | 19.8 | 14.4 | 10.4 | 10.9 | 11.6 | 11.4 | 10.5 | 13.9 | 13 | 27.8 | 19.2 | -- | -- | -- | -- | -- |
| 16 | Bucharest, Romania | 15.8 | 23 | 25.6 | 22.2 | 17.8 | 11 | 10 | 11.8 | 11.9 | 9.6 | 12.4 | 12.2 | 23 | 17.1 | 14.9 | 15.5 | 18.4 | 20.3 | -- |
| 17 | Otopeni, Romania | 15.6 | 18.9 | 27.7 | 21.7 | 14.5 | 10.6 | 10.8 | 12 | 11.5 | 10.7 | 12.1 | 12.1 | 24.8 | 19 | 25.8 | -- | -- | -- | -- |
| 18 | Magurele, Romania | 15 | 19.4 | 22.7 | 18.7 | 12.7 | 9.7 | 9.6 | 11.7 | 21.6 | -- | -- | -- | 14.3 | 16.5 | 15.5 | -- | 15.7 | 18.9 | -- |
| 19 | Radauti, Romania | 14.7 | 18.9 | 20.5 | 18.9 | 12.9 | 10.7 | 9.7 | 9.2 | 12.2 | 13.2 | 12.8 | 14.2 | 23.5 | 17.7 | 20.3 | -- | -- | -- | -- |
| 20 | Feleacu, Romania | 14.3 | 18.5 | 22.3 | 17.5 | 14 | 11.1 | 10.4 | 11.9 | 11.1 | 10.7 | 11.4 | 14.1 | 16.7 | 18 | -- | -- | -- | -- | -- |
| 21 | Iasi, Romania | 14.1 | 19.9 | 19.3 | 17.9 | 14.5 | 9.9 | 9 | 9.2 | 10.6 | 9.3 | 10.9 | 13.9 | 25.8 | 17.3 | 20.6 | -- | 22.4 | 27 | -- |
| 22 | Sibiu, Romania | 14.1 | 17.5 | 20.2 | 19.8 | 12.9 | 9.6 | 10.3 | 12.4 | 12.6 | 12.3 | 11.5 | 11.2 | 21.2 | 12.4 | 9.7 | -- | -- | -- | -- |
| 23 | Codlea, Romania | 13.9 | 23.2 | 17.4 | 18.9 | 13.3 | 8 | 5.9 | 7.1 | 7.9 | 6.6 | 15 | 10.6 | 30.1 | 31.5 | -- | -- | -- | -- | -- |
| 24 | Brasov, Romania | 13.6 | 17.7 | 28 | 14.8 | 10.4 | 8.8 | 8.8 | 11.3 | 11 | 10.8 | 10.6 | 9.1 | 22.7 | 16.4 | 17.3 | 18.3 | 18 | 21.3 | -- |
| 25 | Timisoara, Romania | 12.8 | 13.1 | 22.1 | 14.6 | 10.6 | 10.4 | 10.9 | -- | 12 | 11.4 | 10.5 | 9.9 | 15 | 13.9 | 14.3 | -- | -- | -- | -- |
| 26 | Caciulati, Romania | 12.7 | 15.2 | 20 | 15.6 | 10.2 | 8 | 8.1 | 10 | 11.7 | 7.7 | -- | -- | 29.2 | 13.2 | 15.4 | -- | -- | -- | -- |
| 27 | Tomesti, Romania | 12.1 | 16.4 | 16.2 | 14.1 | 11.6 | 8.7 | 7.7 | 8.6 | 9.6 | 8.9 | 9.4 | 12.1 | 23.4 | -- | -- | -- | -- | -- | -- |
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