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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 |  Coyhaique Chile | 37 | 40.5 | -- | -- | -- | -- | -- | -- | -- |
| 3 | Nacimiento Chile | 35.5 | 30.4 | 32.4 | 22.4 | 26.2 | 27.3 | -- | -- | -- |
| 4 |  Santa Anita Peru | 33 | 23.4 | 22.4 | 38.8 | 36.2 | -- | -- | -- | -- |
| 5 | Cochrane Chile | 32.9 | 27.8 | -- | -- | -- | -- | -- | -- | -- |
| 6 | Puente Piedra Peru | 28.9 | 26.2 | 27.4 | 32.9 | -- | -- | -- | -- | -- |
| 7 | Angol Chile | 28.7 | 30.6 | 25.7 | 20.9 | 47.7 | -- | -- | -- | -- |
| 8 | Comas Peru | 28.7 | 25.4 | -- | -- | -- | -- | -- | -- | -- |
| 9 | Pitrufquen Chile | 27.9 | 36.6 | 27.6 | -- | -- | -- | -- | -- | -- |
| 10 | Loncoche Chile | 27.5 | 4.4 | -- | -- | -- | -- | -- | -- | -- |
| 11 | San Juan de Lurigancho Peru | 27.1 | 27.5 | 24.7 | 41.2 | 34 | 22.4 | -- | -- | -- |
| 12 | Pachacamac Peru | 26.6 | 40.3 | 31.8 | 45.8 | -- | -- | -- | -- | -- |
| 13 | San Borja Peru | 26.5 | 24.7 | -- | -- | -- | -- | -- | -- | -- |
| 14 | Arequipa Peru | 26.1 | 16.3 | 13.9 | 14.4 | -- | -- | -- | -- | -- |
| 15 | Victoria Chile | 25.4 | 26.7 | 27.4 | 25.5 | 44.1 | -- | -- | -- | -- |
| 16 | Osorno Chile | 24.8 | 26.4 | 16.1 | 17.1 | 17.9 | 19.2 | 32.8 | 38.2 | 30.8 |
| 17 | Los Cerrillos Chile | 24.3 | 23.6 | 29.8 | -- | -- | -- | -- | -- | -- |
| 18 | Pudahuel Chile | 22.8 | 22.9 | 25.7 | -- | -- | -- | -- | -- | -- |
| 19 | Padre las Casas Chile | 22 | 25 | 29.4 | 33.8 | 37.2 | 28.6 | 32.5 | 43.3 | 38.8 |
| 20 | Quilicura Chile | 21.2 | 20.7 | 24 | 24.5 | 25.5 | 22.3 | 25.3 | -- | -- |
| 21 | Llaillay Chile | 21.1 | 20.5 | 25 | 29 | 20.9 | -- | -- | -- | -- |
| 22 | Talagante Chile | 20.3 | 18.8 | 22.3 | 27 | 29.4 | -- | 22.7 | -- | -- |
| 23 | Rancagua Chile | 20.2 | 22.2 | 24.2 | 25.4 | 25.4 | 23.8 | 26.9 | 22.9 | 23.3 |
| 24 | Temuco Chile | 19.7 | 18.1 | 16.8 | 26.3 | 32.7 | 20.6 | 20.2 | 30.4 | 28.7 |
| 25 | Maule Chile | 19.7 | 16.5 | 16.4 | -- | -- | -- | -- | -- | -- |
| 26 | Santiago Chile | 18.9 | 17.3 | 21.3 | 25.8 | 25.8 | 23.6 | 27.7 | 29.4 | 23.1 |
| 27 | Penaflor Chile | 18.8 | 20.6 | 10 | -- | -- | -- | -- | -- | -- |
| 28 | San Felipe Chile | 18.8 | 21.1 | 22.7 | 23.8 | -- | -- | -- | -- | -- |
| 29 | Lima Peru | 18.5 | 18.2 | 19.7 | 25.6 | 31.5 | 18 | 23.7 | 28 | 27.7 |
| 30 |  Itagui Colombia | 18.3 | 25.7 | 18.2 | -- | -- | -- | -- | -- | -- |
| 31 | Curico Chile | 18.2 | 17.4 | 18.7 | 17.1 | 19 | 19 | 25.8 | 16.8 | 23 |
| 32 |  Taboao da Serra Brazil | 18.1 | 12.6 | 14 | -- | -- | -- | -- | -- | -- |
| 33 | Puente Alto Chile | 18.1 | 19.2 | 20.8 | 19.7 | 22.7 | 20.6 | 23.5 | -- | -- |
| 34 | Las Condes Chile | 18 | 17.2 | 20 | 21.6 | 18 | 15.4 | 19.9 | -- | -- |
| 35 | Curanilahue Chile | 17.8 | 17.4 | 15.2 | 15.3 | 16.1 | 15.4 | 21.6 | -- | -- |
| 36 | Laja Chile | 17.8 | 15.8 | 18 | 17.4 | -- | -- | -- | -- | -- |
| 37 | Coronel Chile | 17.3 | 21.9 | 22.9 | 24.7 | 33.3 | 20.7 | 11.8 | 19 | 22.9 |
| 38 | San Antonio Chile | 17.3 | 19.2 | 17.2 | 17.2 | -- | -- | -- | -- | -- |
| 39 | Chillan Chile | 17.2 | 19.2 | 22.5 | 19.1 | 22.7 | 16 | 20.4 | 21.5 | 27.7 |
| 40 | Rengo Chile | 17.2 | 18.5 | 16.6 | 18.8 | 16.8 | 18.8 | 24.1 | 18.9 | 16.3 |
| 41 | Bajo Pichanaqui Peru | 17.1 | 21 | -- | -- | -- | -- | -- | -- | -- |
| 42 | Carabayllo Peru | 17.1 | 24.6 | 28 | 37.6 | 27.6 | 18.6 | -- | -- | -- |
| 43 | Osasco Brazil | 16.8 | 22.1 | 19.4 | 15.1 | 16.8 | 16.7 | 19.8 | 22.1 | -- |
| 44 | Rio Claro Brazil | 16.6 | 20.8 | 15.5 | 14.9 | 16.7 | 17.8 | -- | -- | -- |
| 45 | Placilla Chile | 16.5 | 15 | 22.2 | 18.9 | 18 | -- | -- | -- | -- |
| 46 | Quilpue Chile | 16.5 | 18.5 | 19.9 | 39.1 | -- | -- | -- | -- | -- |
| 47 | Concon Chile | 16.3 | 11.5 | 12.3 | 14.2 | 14.4 | 12.4 | 14.1 | -- | -- |
| 48 | Puerto Varas Chile | 16.2 | 17.9 | 16.8 | 20.3 | 18.2 | -- | -- | -- | -- |
| 49 | Puchuncavi Chile | 16.1 | 15 | 15 | 15.2 | 15.4 | 14 | 15.9 | 14.8 | 13.7 |
| 50 | Caldas Colombia | 16.1 | 20.3 | 16.8 | -- | -- | -- | -- | -- | -- |
| 51 | San Fernando Chile | 16 | 17.9 | 23.2 | 20.5 | 21.5 | 17.7 | 21 | 15.3 | 18.1 |
