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
| Rank | City | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Tlaxcalancingo Mexico | 32.6 | 45 | 29.9 | -- | -- | -- | -- | -- | -- |
| 2 | Saltillo Mexico | 32.3 | 17.7 | 15.6 | 17.9 | 23.2 | -- | -- | -- | -- |
| 3 | Santa Anita Mexico | 29.1 | 22.2 | 32.3 | -- | -- | -- | -- | -- | -- |
| 4 | Calimaya Mexico | 27 | 25.2 | -- | -- | -- | -- | -- | -- | -- |
| 5 | Las Pintas Mexico | 25.2 | 47.5 | 43.2 | -- | -- | -- | -- | -- | -- |
| 6 |  Flin Flon Canada | 24 | 8.6 | 14.6 | 5.1 | 8.2 | -- | -- | -- | -- |
| 7 | Pinehouse Canada | 23.8 | 12.4 | 3.9 | 4.3 | 5.7 | -- | -- | -- | -- |
| 8 | Tuxtla Gutierrez Mexico | 22.3 | 22.2 | 40.4 | -- | -- | -- | -- | -- | -- |
| 9 | Atotonilco de Tula Mexico | 22.3 | 36.4 | 25.1 | 26.5 | 34.3 | -- | -- | -- | -- |
| 10 | Alvaro Obregon Mexico | 22.3 | 20.9 | -- | -- | -- | -- | -- | -- | -- |
| 11 | Juarez Mexico | 21 | 20.3 | -- | -- | -- | -- | -- | -- | -- |
| 12 | Cuidad Benito Juarez Mexico | 21 | 23.2 | -- | -- | -- | -- | -- | -- | -- |
| 13 | Tlalnepantla de Baz Mexico | 20 | 16 | 24 | -- | -- | -- | -- | -- | -- |
| 14 | Nezahualcóyotl Mexico | 19.8 | 16.7 | 21.3 | 19.9 | 22 | 23.3 | -- | -- | -- |
| 15 | Tizayuca Mexico | 19.6 | 17.4 | 17 | 17.5 | 19.7 | -- | -- | -- | -- |
| 16 | Aguascalientes Mexico | 19.5 | 11.4 | 15.8 | 13.7 | 21.8 | -- | -- | -- | -- |
| 17 | Polanco Mexico | 19.5 | 24.9 | -- | -- | -- | -- | -- | -- | -- |
| 18 | Mexico City Mexico | 19.4 | 19.5 | 22.3 | 22.1 | 21.7 | 18.8 | 20.5 | 19.7 | 20.4 |
| 19 | Coyoacan Mexico | 19.3 | 19.6 | 23 | 17.8 | 18.9 | 16.2 | 19.6 | -- | -- |
| 20 | Garcia Mexico | 18.6 | 15.3 | 20.6 | 24.6 | 19.9 | 23.9 | 24.3 | -- | -- |
| 21 | San Luis de la Paz Mexico | 18.5 | 16.1 | 14.2 | 13.9 | 11.1 | 10.9 | 11.9 | -- | -- |
| 22 | Silao Mexico | 18.3 | 18 | 17.3 | 16.4 | 18.6 | 19 | -- | -- | -- |
| 23 | Guadalupe Mexico | 18.3 | 19.7 | 17.9 | 17.2 | 22.1 | 19.1 | 17.1 | -- | -- |
| 24 | Leon Mexico | 18.1 | 17.8 | 17.3 | 17 | 16.6 | 19 | 20.9 | 20.8 | 27.3 |
| 25 | Mixquiahuala de Juarez Mexico | 17.7 | 16.5 | -- | -- | -- | -- | -- | -- | -- |
| 26 | General Escobedo Mexico | 17.4 | 20.3 | 19.8 | 21.6 | 23.1 | 18.9 | 20.9 | -- | -- |
| 27 |  Villa Nueva Guatemala | 17.2 | 21.1 | -- | -- | -- | -- | -- | -- | -- |
| 28 | San Nicolas de los Garza Mexico | 17.2 | 19.3 | 19.3 | 20.2 | 20.1 | 20.1 | 20.8 | -- | -- |
| 29 | Salamanca Mexico | 16.9 | 16.8 | 21.3 | 20 | 19.6 | 18 | 20.9 | 20.9 | 25.1 |
| 30 | Guadalajara Mexico | 16.8 | 17.7 | 25.8 | 26.7 | 25.4 | 24.5 | 18.9 | -- | -- |
| 31 | Irapuato Mexico | 16.4 | 16.8 | 15.8 | 18.1 | 17.9 | 18.2 | 19.2 | 19.7 | 23.2 |
| 32 | San Bernardino Tlaxcalancingo Mexico | 16.4 | 16.4 | -- | -- | -- | -- | -- | -- | -- |
| 33 | Zacatepec Mexico | 16.3 | 9.1 | 16.3 | -- | -- | -- | -- | -- | -- |
| 34 | Valemount Canada | 16.1 | 12.6 | 15.7 | 10 | 11 | 8.5 | -- | -- | -- |
| 35 | Tehuacan Mexico | 15.8 | 16.6 | -- | -- | -- | -- | -- | -- | -- |
| 36 | El Pueblito Mexico | 15.8 | 14.5 | 16.2 | -- | -- | -- | -- | -- | -- |
| 37 | Buffalo Narrows Canada | 15.7 | 16.3 | -- | -- | -- | -- | -- | -- | -- |
| 38 | Celaya Mexico | 15.7 | 21.6 | 24.2 | 19.2 | 19.3 | 18.6 | 20 | 20.1 | 22.2 |
| 39 | Hall Lake Canada | 15.6 | 10.2 | 13.1 | -- | -- | -- | -- | -- | -- |
| 40 | Santa Catarina Mexico | 15.5 | 17.1 | 18.6 | 21.5 | 21.9 | 20.7 | 22.6 | -- | -- |
| 41 | Ciudad de Mexico Mexico | 15.4 | 18.8 | 15.7 | -- | -- | -- | -- | -- | -- |
| 42 | Guadalupe Victoria Mexico | 15.3 | 14.9 | 18.2 | 43 | 19.6 | -- | -- | -- | -- |
| 43 | Tijuana Mexico | 15.2 | 13.5 | 15.6 | 18 | 14.5 | 26.1 | -- | -- | -- |
| 44 | Morelia Mexico | 15.2 | 20.2 | 21.6 | 19.9 | 21.9 | -- | 16.5 | -- | -- |
| 45 | Puebla Mexico | 15 | 17.4 | 19.3 | 13 | 9.8 | 13 | -- | -- | -- |
| 46 | Rancho Bellavista [Fraccionamiento] Mexico | 15 | 17.2 | 27.5 | 22.4 | -- | -- | -- | -- | -- |
| 47 | Mexicali Mexico | 14.9 | 14.5 | 13.8 | 14.4 | 15.9 | 19.7 | 17.7 | 30.2 | 22.7 |
| 48 | Tepic Mexico | 14.9 | 12.8 | 9.4 | 11.3 | 16.4 | 11.3 | 9.2 | -- | -- |
| 49 | Monterrey Mexico | 14.9 | 15.6 | 17.1 | 18.1 | 20.1 | 14.5 | 19.3 | 17.2 | 15.7 |
| 51 | Tulancingo Mexico | 14.6 | 14.4 | 11.9 | 1.3 | 15.7 | 12.4 | -- | -- | -- |
