2017-2023
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
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 |  Spešov, Czech Republic | 20 | 29.1 | 33.6 | 26.2 | 19.9 | 12.1 | 11.5 | 9 | 11.1 | 22.4 | 17 | 17.1 | 35 | -- | -- | -- | -- | -- | -- |
| 2 | Hnevosice, Czech Republic | 18.3 | -- | -- | 13.3 | 25.9 | 19.4 | 15.9 | 12.2 | 13.6 | 17.8 | 14.4 | 18 | 28.4 | -- | -- | -- | -- | -- | -- |
| 3 | Karviná, Czech Republic | 17.4 | 17.8 | 23.7 | 20.7 | 25.5 | 16.8 | 15.5 | 12 | 13 | 15.4 | 12.1 | 10.9 | 25.4 | 19.2 | 33 | 18.3 | 22.1 | 27.1 | 24.6 |
| 4 | Rychvald, Czech Republic | 16.5 | 18.4 | 23 | 19.3 | 19.9 | 14.7 | 13.1 | 11.4 | 12.1 | 14.4 | 13.1 | 13 | 24.2 | 19.7 | 27.1 | -- | 17.1 | -- | -- |
| 5 | Dolní Lutyně, Czech Republic | 15.9 | 19.1 | 23.4 | 20.8 | 18.8 | 13.7 | 11.7 | 10.1 | 10.9 | 12.5 | 12.7 | 11.5 | 25.2 | 20.7 | 22.8 | 20.9 | 27.7 | 35.8 | 32.3 |
| 6 | Havířov, Czech Republic | 15.9 | 17.2 | 22.6 | 18.3 | 19.4 | 15.5 | 13.8 | 11.6 | 11.8 | 13 | 11.1 | 11.7 | 25.8 | 18.3 | 19.6 | 18 | 20.3 | 28.8 | 26.7 |
| 7 | Hodonín, Czech Republic | 15.6 | 12.3 | 17.6 | 14.4 | 13.1 | -- | -- | -- | 22.2 | 21 | 10.9 | 10.2 | 20 | 11.8 | 9.9 | -- | 14.8 | 16.6 | 17.8 |
| 8 | Rostěnice-Zvonovice, Czech Republic | 15.5 | 20.6 | 21.9 | 20.2 | 18.1 | 13.7 | 12.6 | 9.7 | 12.8 | 14.3 | 10.5 | 11.3 | 21 | -- | -- | -- | -- | -- | -- |
| 9 | Český Těšín, Czech Republic | 15.3 | 16.7 | 21.7 | 17 | 18 | 14.8 | 14 | 11.6 | 12.5 | 14.1 | 10.6 | 10.1 | 22.9 | -- | -- | -- | -- | -- | -- |
| 10 | Frydlant, Czech Republic | 15 | 16.2 | 25.4 | 21.2 | 19 | 16.5 | 14.4 | 9.9 | 10.2 | 12.7 | 10.8 | 11.6 | 14.9 | 20.2 | 22.2 | 19.3 | 19.1 | -- | -- |
| 11 | Děčín, Czech Republic | 14.8 | 16.4 | 20.8 | 17.4 | 14.8 | 13.2 | 12.6 | 9.9 | 11.2 | 13.4 | 15.2 | 13.1 | 20.3 | 16 | 17.1 | 16.4 | 17.8 | 23.1 | 23 |
| 12 | Tesin, Czech Republic | 14.7 | 16.8 | 28.5 | 22.6 | 17.5 | 14 | 12.4 | 9.7 | 9.3 | 11.4 | 9.3 | 10.2 | 35.8 | 17.6 | 19.5 | 17.9 | 20 | 29.6 | 27.2 |
| 13 | Ostrava, Czech Republic | 14.6 | 18.1 | 22.9 | 17.5 | 17.5 | 12.8 | 10.9 | 8.6 | 9.7 | 12.2 | 11.8 | 10.9 | 22.8 | 18.7 | 19.6 | 16.8 | 20.9 | 30.1 | 27.8 |
| 14 | Frýdek-Místek, Czech Republic | 14.2 | 16.5 | 20.5 | 18.1 | 17.3 | 14.1 | 12.4 | 10.7 | 11 | 11.5 | 9.6 | 9.5 | 20.2 | 17.2 | 17.8 | 16.2 | 17.6 | 26.9 | 25 |
| 15 | Studénka, Czech Republic | 14 | 14.9 | 19.9 | 16.8 | 15.2 | 12.1 | 12 | 11.2 | 11.2 | 11.5 | 10.6 | 11.3 | 21.2 | 15.8 | 17.2 | 16.2 | 18 | 25.4 | 24.3 |
| 16 | Olomouc, Czech Republic | 13.9 | 13.4 | 19.7 | 18.2 | 16.4 | 11.2 | 11.3 | 9.5 | 10 | 13.2 | 13 | 10.7 | 20.1 | 14.6 | 17.7 | 15.8 | 16.1 | 19 | 20.4 |
| 17 | Klatovy, Czech Republic | 13.6 | 15.8 | 28.7 | 16.5 | 14.8 | 10.6 | 5.8 | 6.4 | 8.9 | 10.7 | 10 | 7.1 | 14.7 | 16.7 | 20.9 | -- | 10.8 | -- | -- |
| 18 | Třinec, Czech Republic | 13.5 | 16.2 | 21.1 | 17.3 | 17.3 | 12.6 | 11.7 | 9.9 | 10.4 | 11.3 | 8.4 | 8.5 | 17.5 | 17.5 | 18.2 | 15.1 | 18.2 | 26.5 | 26.7 |
| 19 | Přerov, Czech Republic | 13.5 | 15.1 | 20.2 | 16.1 | 13.6 | 11.5 | 11.3 | 11.1 | 10.2 | 12.7 | 10.6 | 10.1 | 20.3 | 15.5 | 16.2 | 15.5 | 17.9 | 22.9 | 24.4 |
| 20 | Valasske Mezirici, Czech Republic | 13.5 | 15.5 | 20.8 | 17.5 | 15.7 | 11.7 | 11.4 | 9.9 | 9.6 | 11.3 | 9.8 | 9.9 | 18.8 | 15.4 | 17.4 | 15 | 17.2 | 24.8 | 24.9 |
| 21 | Rožnov pod Radhoštěm, Czech Republic | 13.4 | 17.1 | 25.4 | 19.6 | 17.5 | 12.1 | 10.4 | 8.8 | 9 | 10.3 | 9.6 | 8.2 | 19.3 | 16.8 | -- | -- | -- | -- | -- |
| 22 | Bělotín, Czech Republic | 13.2 | 13.8 | 19 | 15.3 | 14.6 | 11.9 | 11.1 | 10.5 | 10.2 | 12.4 | 8.9 | 9.9 | 18.7 | 15.1 | 16.5 | -- | 17.6 | 23.7 | 23.4 |
| 23 | Opava, Czech Republic | 12.9 | 15.5 | 18.3 | 15.6 | 15.9 | 12.6 | 10.2 | 8.9 | 9.2 | 11.4 | 10.3 | 8.7 | 18.7 | 15.2 | 15.8 | 14.9 | 16.9 | 24.5 | 22.7 |
| 24 | Moravska Trebova, Czech Republic | 12.9 | 18 | 21.7 | 16.3 | 13.9 | 10.7 | 10.8 | 9 | 8.5 | 9.8 | 10.7 | 8.3 | 17.7 | 15.8 | 17 | 16.2 | 18.9 | 23 | 18.9 |
| 25 | Zlín, Czech Republic | 12.7 | 15.5 | 21.3 | 16.1 | 13.9 | 10 | 9.7 | 9.1 | 9 | 10.4 | 9 | 9.6 | 18.9 | 15.7 | 14.7 | 13 | 16.5 | 21.7 | 21.3 |
| 26 | Beroun, Czech Republic | 12.4 | 13.8 | 18.2 | 14.3 | 12.4 | 12.1 | 12.6 | 9.6 | 9.3 | 11.6 | 11.9 | 8.3 | 15.6 | 14.2 | 15.3 | 14 | 15.6 | 22.5 | 18.8 |
| 27 | Choceň, Czech Republic | 12.4 | 16 | 18.3 | 15.3 | 15.2 | 11.7 | 11.7 | 7.1 | 9.6 | 11.6 | 9.1 | 8.8 | 15.5 | 14.2 | -- | -- | -- | -- | -- |
| 28 | Nizbor, Czech Republic | 12.2 | -- | 10.1 | 16 | 16.1 | 13.5 | 14 | 7.1 | 11.7 | 12.9 | 9.5 | 7.7 | 14.4 | -- | -- | -- | -- | -- | -- |
| 29 | Teplice, Czech Republic | 12.2 | 13.7 | 17.7 | 14 | 12.5 | 10.4 | 11.1 | 8.4 | 9.6 | 12 | 11.8 | 10.1 | 16 | 13.3 | 13.3 | 13.4 | 14.2 | 19.1 | 18.8 |
| 30 | Hradec Kralove, Czech Republic | 12 | 13.8 | 17.8 | 12.9 | 12.9 | 11.1 | 11.8 | 9.5 | 9.6 | 12 | 11.2 | 7.4 | 14.2 | 13.3 | 14.5 | 13.7 | 14.8 | 19.7 | 19 |
| 31 | Znojmo, Czech Republic | 11.9 | 14.3 | 16.2 | 14.1 | 12.2 | 10.6 | 10.4 | 8.7 | 9.4 | 11.7 | 10.9 | 9.3 | 16 | 12.2 | 11.8 | 11.9 | 14.2 | 19.7 | 17.4 |
| 32 | Měňany, Czech Republic | 11.8 | 11.5 | 16 | 13.4 | 10.5 | 11.8 | 13.3 | 11.1 | 11.2 | 10.9 | 11.3 | 8.5 | 12.8 | 13.6 | -- | -- | -- | -- | -- |
| 33 | Pardubice, Czech Republic | 11.7 | 13.9 | 17.7 | 11.8 | 13.1 | 11.6 | 11.3 | 8.8 | 8.2 | 12.5 | 10.1 | 7.9 | 14.6 | 12.8 | 13.8 | 12.5 | 14.7 | 19.4 | 18.3 |
| 34 | Štětí, Czech Republic | 11.7 | 13.4 | 20.9 | 14.3 | 12.7 | 10.1 | 9.8 | 7.7 | 7.6 | 10 | 10.8 | 8.5 | 14.6 | 15 | 13 | -- | 16.3 | -- | -- |
| 35 | Mladá Boleslav, Czech Republic | 11.6 | 14.1 | 16.9 | 12.3 | 10.9 | 10.6 | 11.3 | 8.5 | 8.9 | 11 | 10.6 | 8.4 | 15.5 | 13.1 | 13.4 | 13 | 15.6 | 19.1 | 15.9 |
| 36 | Rožďalovice, Czech Republic | 11.6 | 13.9 | 18.3 | 12.9 | 11.6 | 10.5 | 10.2 | 8.5 | 8.3 | 9.4 | 9.5 | 10.1 | 16 | 12.7 | 13.4 | 13.6 | 13 | 19.2 | 18.6 |
| 37 | Brno, Czech Republic | 11.6 | 13.9 | 15.9 | 13.8 | 11.4 | 9.3 | 9.2 | 7.7 | 8.4 | 10.6 | 10.4 | 10 | 18.1 | 13.9 | 15.4 | 13.5 | 15.7 | 20.4 | 18.8 |
| 38 | Most, Czech Republic | 11.6 | 10.4 | 15.7 | 12.1 | 11.9 | 10.9 | 12.7 | 9.3 | 10.6 | 13.1 | 10.5 | 6.4 | 16.2 | 12.9 | 14.1 | 13.8 | 15.1 | 21.7 | 18.3 |
| 39 | Mariánské Radčice, Czech Republic | 11.4 | 11.5 | 14.4 | 11.5 | 10.9 | 10.2 | 11.9 | 9 | 10.6 | 11.8 | 10 | 8.5 | 16.5 | 13.3 | 14.5 | 14.9 | 15.5 | 20.5 | 18.7 |
| 40 | Kolín, Czech Republic | 11.3 | 11.3 | 18.3 | 13.2 | 13.4 | 11.2 | 9.9 | 7.1 | 8.3 | 9.7 | 10.7 | 8.2 | 15.5 | 12.6 | -- | -- | -- | -- | -- |
| 41 | Usti nad Labem, Czech Republic | 11.3 | 13.4 | 17.3 | 13.7 | 11.9 | 9.7 | 10.9 | 7 | 8.1 | 10.3 | 10.6 | 8.4 | 15 | 13.8 | 12.9 | 12 | 14.1 | 18.3 | 17 |
| 42 | Kutná Hora, Czech Republic | 10.8 | 10.7 | 16.4 | 12 | 11.9 | 10.8 | 10.6 | 8.1 | 8.4 | 9.9 | 9.6 | 7.6 | 12.6 | 13 | 16 | -- | 12 | -- | -- |
| 43 | Liberec, Czech Republic | 10.5 | 10.2 | 14.5 | 11 | 12.1 | 10.6 | 10.7 | 8.9 | 9 | 10.4 | 9.3 | 7.8 | 12 | 11.7 | 11.4 | 11.6 | 12.5 | 18.4 | 15.8 |
| 44 | Kladno, Czech Republic | 10.4 | 9.9 | 14.8 | 10.7 | 10.8 | 11 | 10.6 | 7.9 | 8.8 | 10.6 | 9.7 | 6.4 | 15.3 | 13.1 | 12 | 12.3 | 12.2 | 19 | 18 |
| 45 | Kadaň, Czech Republic | 10.3 | 9.1 | 13.2 | 10.9 | 9.8 | 11.6 | 12.4 | 8.7 | 8.8 | 12.1 | 9.3 | 5.9 | 12.5 | 11.5 | 11.9 | 11.2 | 12.8 | 18.8 | 14.8 |
| 46 | Litoměřice, Czech Republic | 10.3 | 10.2 | 15.4 | 12.4 | 11.1 | 10.3 | 10.6 | 7.7 | 9.3 | 10.4 | 9.8 | 7.9 | 16.4 | 16.9 | 19 | 12.4 | -- | -- | -- |
| 47 | Kuchařovice, Czech Republic | 10.2 | 9.8 | 12.8 | 12.5 | 9 | 9.1 | 9.7 | 9.9 | 8.8 | 11.1 | 9.5 | 9.2 | 8.9 | 11.4 | -- | -- | -- | -- | -- |
| 48 | Kroměříž, Czech Republic | 10.2 | 11.3 | 15.1 | 12.5 | 11.7 | 9.1 | 9 | 8.4 | 8.4 | 10.2 | 6.9 | 5.7 | 13.8 | 11.6 | 13.2 | 12 | 14.3 | 20.8 | 18.5 |
| 49 | Chomutov, Czech Republic | 10.1 | 9.5 | 12.5 | 10.2 | 10.6 | 10.6 | 10.5 | 7.6 | 8.3 | 10.4 | 9.8 | 7.8 | 18.7 | 11.8 | 11.3 | 11.9 | -- | -- | -- |
| 50 | Sedlec, Czech Republic | 10 | 10.2 | 12.6 | 12.4 | 10.6 | 9.2 | 9.4 | 9 | 8.6 | 10.4 | 8.1 | 6.6 | 12.9 | 10.5 | 10.5 | 10.3 | 12.6 | 18.6 | 16.2 |
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