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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 51 |  Trutnov, Czech Republic | 9.9 | 10 | 13.6 | 12.1 | 11.1 | 10 | 10.7 | 8.4 | 8.6 | 10 | 9.1 | 8 | 14.1 | 11.6 | 14.2 | 12.9 | -- | -- | -- |
| 52 | Budejovice, Czech Republic | 9.8 | 9.5 | 13.7 | 10.8 | 9.3 | 9.5 | 10.1 | 7.5 | 7.7 | 8.9 | 9.9 | 7.9 | 12.8 | 11.1 | 10.7 | 11 | 12.7 | 16.9 | 17.1 |
| 53 | Prague, Czech Republic | 9.8 | 9.1 | 14.2 | 10.5 | 10.5 | 10.5 | 10.6 | 7.5 | 8.1 | 10.4 | 9.8 | 6.2 | 10.3 | 11.9 | 11.3 | 10.9 | 11.5 | 17.4 | 15.6 |
| 54 | Česká Lípa, Czech Republic | 9.6 | 8.9 | 13.9 | 10.7 | 10.7 | 10.3 | 10.4 | 7.9 | 8.8 | 10.3 | 8.9 | 6.5 | 13.4 | -- | -- | -- | -- | -- | -- |
| 55 | Pilsen, Czech Republic | 9.5 | 10 | 15.4 | 11.2 | 10.7 | 9.6 | 10.6 | 8 | 7.3 | 8.2 | 7.3 | 5.5 | 10.8 | -- | -- | -- | -- | -- | -- |
| 56 | Třebíč, Czech Republic | 9.5 | 9.7 | 15.9 | 12 | 12 | 9.7 | 8.6 | 7.5 | 8.5 | 9.6 | 8.5 | 6.9 | 13.3 | 11.2 | 12.5 | 11.5 | -- | -- | -- |
| 57 | Hradek nad Nisou, Czech Republic | 9 | 9.7 | 13.2 | 11.3 | 11.1 | 9.8 | 9 | 6.5 | 6.8 | 7.5 | 7.5 | 6.5 | 9.3 | -- | -- | -- | -- | -- | -- |
| 58 | Pelhřimov, Czech Republic | 8.9 | 5.1 | 7.3 | 19.3 | 9.4 | 9.4 | 13.9 | 9 | 9.6 | 9.2 | 9.7 | 6.1 | 8.5 | 11.5 | 10.1 | -- | -- | -- | -- |
| 59 | Kamenný Újezd, Czech Republic | 8.7 | 9.8 | 8.1 | 9 | 8.7 | 8.7 | 10 | 8.6 | 8.5 | 9.1 | 9.2 | 5.1 | 9.5 | 11.6 | 10.6 | 11.5 | 12 | 16.4 | 16.9 |
| 60 | Křešín, Czech Republic | 8 | 6.9 | 10.6 | 7.9 | 8.5 | 9.1 | 9.8 | 8 | 8.2 | 8.8 | 7 | 4.4 | 7.2 | -- | -- | -- | -- | -- | -- |
| 61 | Sokolov, Czech Republic | 7.9 | 7.2 | 10.9 | 7.7 | 7.6 | 8.9 | 9.9 | 7.5 | 7.3 | 8 | 7.2 | 4.6 | 8.5 | 9 | 8.6 | 8.9 | 9.4 | 15.1 | 13.1 |
| 62 | Cheb, Czech Republic | 7.4 | 6.2 | 8.5 | 7.1 | 7.3 | 10.5 | 9.9 | 7.5 | 7 | 7.6 | 6.9 | 3.7 | 7.9 | 9 | 8.1 | 9.2 | -- | -- | -- |
| 63 | Krupka, Czech Republic | 7.3 | 5.7 | 8.2 | 7.5 | 8 | 7.8 | 7.8 | 6.4 | 7.7 | 8.2 | 7.2 | 5.1 | 10.3 | 8.6 | 8.9 | 8.1 | -- | -- | -- |
| 64 | Sedloňov, Czech Republic | 6.8 | 5.4 | 10.5 | 6.6 | 8 | 7.6 | 8.1 | 6.3 | 6.3 | 7.6 | 6.3 | 4.2 | 7 | 8 | 8.3 | 7.9 | -- | -- | -- |
| 65 | Hora Svaté Kateřiny, Czech Republic | 5.7 | 3.9 | 4.5 | 5.3 | 6.4 | 7.8 | 7.8 | 5.5 | 6.3 | 7.1 | 5 | 2.8 | 5.2 | 6.8 | 6.7 | 6.5 | -- | -- | -- |
| 66 | Měděnec, Czech Republic | 5.5 | 3.5 | 4.1 | 5.3 | 6 | 7.4 | 7.8 | 5.5 | 6 | 7.2 | 4.4 | 2.4 | 4.7 | 6.4 | 6.3 | 5.9 | -- | -- | -- |
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