2017-2025
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
2025
World Air Quality Report
2025
World Air Quality Report
PM2.5 legend
0-5Meets WHO guideline
5.1-10Exceeds by 1 to 2 times
10.1-15Exceeds by 2 to 3 times
15.1-25Exceeds by 3 to 5 times
25.1-35Exceeds by 5 to 7 times
35.1-50Exceeds by 7 to 10 times
>50.1Exceeds by over 10 times
| Rank | City | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4320 |  Locarno Switzerland | 8.6 | 8.9 | 10.4 | 11.4 | 10 | -- | -- | -- | -- |
| 4321 | Zurich Switzerland | 8.6 | 7.3 | 8.7 | 10.4 | 11.3 | 8.9 | 10.9 | 11.2 | 10.4 |
| 4322 |  Cherkasy Ukraine | 8.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 4323 |  Barnsley United Kingdom | 8.6 | 7.5 | 6.8 | 8.6 | 9.7 | -- | -- | -- | -- |
| 4324 | Bath United Kingdom | 8.6 | 5.8 | 6.3 | -- | -- | -- | -- | -- | -- |
| 4325 | Faversham United Kingdom | 8.6 | 6.6 | 9.7 | 12.2 | 13.1 | -- | -- | -- | -- |
| 4326 | Letchworth Garden City United Kingdom | 8.6 | 7.6 | 7.8 | -- | -- | -- | -- | -- | -- |
| 4327 | Upminster United Kingdom | 8.6 | 8.5 | -- | -- | -- | -- | -- | -- | -- |
| 4328 | Wigan United Kingdom | 8.6 | 7.5 | 7.6 | -- | -- | -- | -- | -- | -- |
| 4329 | Swansea United Kingdom | 8.6 | 7.9 | 7.7 | 10.5 | 11.7 | 8.3 | 11.2 | 12.8 | 14.7 |
| 4330 |  Hot Springs USA | 8.6 | 9.7 | -- | -- | -- | -- | -- | -- | -- |
| 4331 | Avenal USA | 8.6 | 15.6 | 8.3 | 15.7 | 20 | -- | -- | -- | -- |
| 4332 | Crystal River USA | 8.6 | 8.3 | 8.7 | 8.4 | 8.6 | 8.7 | 8.2 | 8.3 | 9.7 |
| 4333 | Sandersville USA | 8.6 | 8 | 10.6 | 8.2 | -- | -- | -- | -- | -- |
| 4334 | Tucker USA | 8.6 | 8.8 | 13.6 | 12.5 | 14.3 | -- | -- | -- | -- |
| 4335 | Hayden USA | 8.6 | 8 | 13 | 10.4 | 10.4 | -- | -- | -- | -- |
| 4336 | Lewiston USA | 8.6 | 8.3 | 8.1 | 9.7 | 10.4 | 10.5 | 7.5 | 8.3 | 11.4 |
| 4337 | Homewood USA | 8.6 | 6.4 | 10.2 | -- | -- | -- | -- | -- | -- |
| 4338 | Machesney Park USA | 8.6 | 6.7 | 10.7 | -- | -- | -- | -- | -- | -- |
| 4339 | Wheaton USA | 8.6 | 8 | 13.7 | 9.5 | 13.4 | -- | 11.9 | -- | -- |
| 4340 | Evansville USA | 8.6 | 7.8 | 11.4 | 10.2 | 11.6 | 8.3 | 7.6 | 9 | -- |
| 4341 | Fort Wayne USA | 8.6 | 8.3 | 13.6 | 12.9 | 8.3 | -- | 9.6 | 9.1 | 7.7 |
| 4342 | Gary USA | 8.6 | 7.6 | 13.1 | 12.2 | 14.9 | -- | -- | -- | -- |
| 4343 | Larwill USA | 8.6 | 7.1 | 10.9 | 9.1 | 9.8 | -- | 8.6 | 7.9 | 8.7 |
| 4344 | Muncie USA | 8.6 | 7.4 | -- | -- | -- | -- | -- | -- | -- |
| 4345 | Chanute USA | 8.6 | 7.8 | 11.1 | 10 | 10.1 | 8.8 | -- | -- | -- |
| 4346 | Girard USA | 8.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 4347 | Middlesborough USA | 8.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 4348 | Jean Lafitte USA | 8.6 | 9.4 | 9.7 | -- | -- | -- | -- | -- | -- |
| 4349 | Lafayette USA | 8.6 | 9.8 | 7.1 | 8.1 | 7.8 | 8.8 | 8.6 | 9.2 | 8.8 |
| 4350 | University Park USA | 8.6 | 8.3 | 10 | -- | -- | -- | -- | -- | -- |
| 4351 | Pigeon USA | 8.6 | 6.4 | 11.3 | 9.4 | 12.9 | -- | -- | -- | -- |
| 4352 | Standish USA | 8.6 | 9.7 | -- | -- | -- | -- | -- | -- | -- |
| 4353 | Apple Valley USA | 8.6 | 7.5 | 11.2 | 6.1 | 7 | 7.8 | 7 | 7.4 | 7.5 |
| 4354 | Hattiesburg USA | 8.6 | 8.2 | 10.8 | 10.3 | 9.6 | 9.6 | 8.8 | 9.6 | 8.7 |
| 4355 | St. Louis USA | 8.6 | 7.7 | 12.2 | 8.1 | 9 | 8.1 | 8.8 | -- | -- |
| 4356 | Valparaiso USA | 8.6 | 6.7 | -- | -- | -- | -- | -- | -- | -- |
| 4357 | Sussex USA | 8.6 | 7.2 | 10.4 | -- | -- | -- | -- | -- | -- |
| 4358 | Penn Yan USA | 8.6 | 7.5 | 7.6 | -- | -- | -- | -- | -- | -- |
| 4359 | Port Clinton USA | 8.6 | 8.8 | 12.3 | 12 | 13.8 | -- | -- | -- | -- |
| 4360 | Toledo USA | 8.6 | 8.6 | 11.8 | 12.2 | 9.3 | 7.7 | 7.5 | 7.9 | 8 |
| 4361 | Westlake USA | 8.6 | 7.5 | 12.8 | 9.9 | 14.1 | -- | -- | -- | -- |
| 4362 | Avalon USA | 8.6 | 7.1 | 10.2 | 9.3 | 9.5 | -- | -- | -- | -- |
| 4363 | Avon USA | 8.6 | 8 | 11.3 | 9 | -- | -- | -- | -- | -- |
| 4364 | Carnegie USA | 8.6 | 7.3 | 8.9 | 12.7 | 15.6 | -- | -- | -- | -- |
| 4365 | Economy USA | 8.6 | 9 | 13.5 | 11.6 | -- | -- | -- | -- | -- |
| 4366 | Littlestown USA | 8.6 | 7.8 | -- | -- | -- | -- | -- | -- | -- |
| 4367 | McKeesport USA | 8.6 | 7.3 | 11.1 | 10.9 | 13.4 | 11.2 | 13.3 | 10 | 11.2 |
| 4368 | Meadville USA | 8.6 | 7.1 | 11.3 | -- | -- | -- | -- | -- | -- |
| 4369 | Parkside USA | 8.6 | -- | -- | -- | -- | -- | -- | -- | -- |
