2017-2024
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
2024
World Air Quality Report
2024
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
25-35Exceeds by 5 to 7 times
35.1-50Exceeds by 7 to 10 times
>50.1Exceeds by over 10 times
| Rank | City | 2024 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Santa Maria, Peru | 53.4 | -- | -- | 20.9 | 43.2 | 73 | 93.7 | 76.1 | 69.2 | 54.6 | 41.9 | 33.3 | 25.5 | -- | -- | -- | -- | -- | -- | -- |
| 2 |  Coyhaique, Chile | 40.5 | 5.7 | 6.8 | 17.8 | 47.9 | 126.2 | 93.3 | 69.7 | 58.7 | 21.3 | 14.9 | 13 | 8.9 | -- | -- | -- | -- | -- | -- | -- |
| 3 | Pitrufquen, Chile | 36.6 | 4.6 | 4.7 | 11 | 30.9 | 84.2 | 57.3 | 99.3 | 73.2 | 39.5 | 18.3 | 10.3 | 5.7 | 27.6 | -- | -- | -- | -- | -- | -- |
| 4 | Angol, Chile | 30.6 | 3.9 | 3.8 | 5.8 | 26.2 | 104.6 | 47.7 | 54.8 | 60.7 | 29.5 | 9.2 | 5.6 | 3.3 | 25.7 | 20.9 | 47.7 | -- | -- | -- | -- |
| 5 | Nacimiento, Chile | 30.4 | 9.5 | 10.6 | 11.6 | 29.4 | 79.6 | 47.7 | 59 | 56.4 | 23.1 | 13.8 | 9.8 | 16.1 | 32.4 | 22.4 | 26.2 | 27.3 | -- | -- | -- |
| 6 |  Porto Velho, Brazil | 29.5 | 2.5 | 3.3 | 3 | 3.1 | 4.4 | 10.5 | 24.6 | 121.6 | 140 | 21.6 | 9.7 | 5 | 14.3 | 20.2 | 22.1 | -- | -- | -- | -- |
| 7 | San Juan de Lurigancho, Peru | 27.5 | 19.3 | 18.4 | 21.1 | 23.5 | 35 | 61.9 | 38.9 | 30.9 | 27.1 | 34.3 | 25.7 | 22.3 | 24.7 | 41.2 | 34 | 22.4 | -- | -- | -- |
| 8 | Sena Madureira, Brazil | 27.3 | 3.6 | 2.8 | 4 | 4.7 | 6.8 | 15.6 | 32.8 | 64 | 112.3 | 29.9 | 8.2 | 3.8 | 16 | 6.3 | 13.3 | 15.6 | -- | -- | -- |
| 9 | Victoria, Chile | 26.7 | 4.9 | 6.7 | 9.2 | 22.7 | 40.6 | 50.4 | 69.2 | 54.4 | 30.3 | 14.5 | 8 | 5.5 | 27.4 | 25.5 | 44.1 | -- | -- | -- | -- |
| 10 | Osorno, Chile | 26.4 | 2.1 | 3.1 | 9.3 | 13.8 | 61.9 | 38.8 | 66 | 59.5 | 32.6 | 13.3 | 8.6 | 5.9 | 16.1 | 17.1 | 17.9 | 19.2 | 32.8 | 38.2 | 30.8 |
| 11 | Puente Piedra, Peru | 26.2 | 23.7 | 26.9 | 29.8 | 32.3 | 14.9 | 37.4 | 30.4 | 30.7 | 24.9 | 21.7 | 20.1 | 23.6 | 27.4 | 32.9 | -- | -- | -- | -- | -- |
| 12 |  Itagui, Colombia | 25.7 | 25.6 | 25 | 34.4 | 27.7 | 18 | 16.7 | 18.3 | 21.9 | 57.6 | 20.8 | 18.9 | 62 | 18.2 | -- | -- | -- | -- | -- | -- |
| 13 | Comas, Peru | 25.4 | -- | 11 | 13.6 | 16.9 | 31.4 | 36.3 | 32.2 | 30.4 | 28.8 | 23.2 | 20.2 | 21.8 | -- | -- | -- | -- | -- | -- | -- |
| 14 | Padre las Casas, Chile | 25 | 3.5 | 4.1 | 8.7 | 27.8 | 55.5 | 30.6 | 68 | 47.6 | 23.9 | 14.3 | 10 | 7.3 | 29.4 | 33.8 | 37.2 | 28.6 | 32.5 | 43.3 | 38.8 |
| 15 | San Borja, Peru | 24.7 | 13.3 | 15.1 | 16.7 | 18.8 | 29 | 41.6 | 35 | 31.9 | 31.9 | 24.4 | 20.1 | 18.5 | -- | -- | -- | -- | -- | -- | -- |
| 16 | Carabayllo, Peru | 24.6 | 26.7 | 20.4 | 11.2 | 15.3 | 33.4 | 37.7 | 33.2 | 31.8 | 27.4 | 21.6 | 17.3 | 16.1 | 28 | 37.6 | 27.6 | 18.6 | -- | -- | -- |
| 17 | Rio Branco, Brazil | 23.6 | 2.8 | 2.7 | 2.8 | 3.1 | 4.8 | 9.6 | 22.7 | 54.7 | 139.8 | 28.2 | 6.3 | 3.3 | 11.8 | 18.2 | 12.6 | 14.7 | 16 | -- | -- |
| 18 | Los Cerrillos, Chile | 23.6 | 13.7 | 15.1 | 16.1 | 15.5 | 35.3 | 41.2 | 55.7 | 31.4 | 19.7 | 14.8 | 11.5 | 13.4 | 29.8 | -- | -- | -- | -- | -- | -- |
| 19 | Santa Anita, Peru | 23.4 | 17.2 | 15.2 | 18 | 20.1 | 33.6 | 47.5 | 31 | 27.1 | 19.8 | 16.4 | 18.1 | 17.1 | 22.4 | 38.8 | 36.2 | -- | -- | -- | -- |
| 20 | Tarapoto, Peru | 23.3 | -- | 34.3 | 15.8 | 20 | 11.3 | 15.7 | 24.9 | 42.8 | 55.9 | 18.2 | 12.6 | 12.5 | -- | -- | -- | -- | -- | -- | -- |
| 21 | Pudahuel, Chile | 22.9 | 11.8 | 13.1 | 13 | 14 | 39.4 | 46.7 | 61 | 26.3 | 17.1 | 12.8 | 9.2 | 10.4 | 25.7 | -- | -- | -- | -- | -- | -- |
| 22 |  Santa Cruz de la Sierra, Bolivia | 22.3 | -- | 2.8 | 4.8 | 4.5 | 5.8 | 9 | 16 | 32.9 | 74.2 | 63.1 | 8.2 | 5.7 | -- | -- | -- | -- | -- | -- | -- |
| 23 | Rancagua, Chile | 22.2 | 9.9 | 9.5 | 9.6 | 16.4 | 40.1 | 37.7 | 68 | 30.5 | 18.8 | 10.2 | 7.6 | 7.2 | 24.2 | 25.4 | 25.4 | 23.8 | 26.9 | 22.9 | 23.3 |
| 24 | Osasco, Brazil | 22.1 | 10.8 | 13.4 | 13.9 | 20.1 | 21.6 | 32.7 | 30.3 | 32.8 | 46 | 18.3 | 15.2 | 12.9 | 19.4 | 15.1 | 16.8 | 16.7 | 19.8 | 22.1 | -- |
| 25 | Cobija, Bolivia | 21.9 | 0.8 | 0.9 | 1 | 5 | 7.4 | 11.9 | 21.2 | 33.5 | 108.3 | 53.2 | 9.3 | 5.3 | 10.2 | 41.8 | -- | -- | -- | -- | -- |
| 26 | Coronel, Chile | 21.9 | 10.2 | 10.7 | 10.4 | 23.5 | 50.2 | 24 | 52.1 | 32.8 | 16.6 | 13.6 | 8.5 | 8.8 | 22.9 | 24.7 | 33.3 | 20.7 | 11.8 | 19 | 22.9 |
| 27 | Machali, Chile | 21.2 | 9.7 | 9.8 | 12.8 | 21.6 | 38.3 | 25.4 | 65.3 | 35.5 | 24.3 | 15.6 | 9.8 | 9.4 | 10.9 | 28.3 | -- | -- | -- | -- | -- |
| 28 | San Felipe, Chile | 21.1 | 13.8 | -- | 15.8 | 16 | 31.9 | 32.3 | 42.8 | 26.1 | 15.9 | 12.7 | 10.9 | 11.8 | 22.7 | 23.8 | -- | -- | -- | -- | -- |
| 29 | Puerto Maldonado, Peru | 20.9 | 6.9 | 6.2 | 6.9 | 10.9 | 7.4 | 13.2 | 20.1 | 46.4 | 78.5 | 45.1 | 7.2 | 7.1 | 14.8 | 20.5 | 13 | -- | -- | -- | -- |
| 30 | Rio Claro, Brazil | 20.8 | 9.1 | 10.3 | 11.5 | 19.2 | 30.3 | 28.9 | 26.3 | 31.9 | 44.8 | 19.4 | 12.4 | 9.7 | 15.5 | 14.9 | 16.7 | 17.8 | -- | -- | -- |
| 31 | Quilicura, Chile | 20.7 | 13.2 | 13.2 | 14 | 17.2 | 31.6 | 32.5 | 52.8 | 27.3 | 17.6 | 12.2 | 7.5 | 10.1 | 24 | 24.5 | 25.5 | 22.3 | 25.3 | -- | -- |
| 32 | Penaflor, Chile | 20.6 | 10.9 | 10.4 | 10.7 | 14.3 | 36.8 | 33.2 | 68 | 29.6 | 16.4 | 10.6 | 5.5 | 7.4 | 10 | -- | -- | -- | -- | -- | -- |
| 33 | Llaillay, Chile | 20.5 | 17.8 | 20.9 | 18.8 | 17.1 | 25 | 23.2 | 42.9 | 20.5 | 16.7 | 14.8 | 13.3 | 14.5 | 25 | 29 | 20.9 | -- | -- | -- | -- |
| 34 | Caldas, Colombia | 20.3 | 23.8 | 22.6 | 30.9 | 24.2 | 17.2 | 14.4 | 16.6 | 18.9 | 21.3 | 17.6 | 11.8 | 60.2 | 16.8 | -- | -- | -- | -- | -- | -- |
| 35 | Ribeirao Preto, Brazil | 19.9 | 7.3 | 7.5 | 8.3 | 13.3 | 17.9 | 20 | 23.8 | 38.8 | 56.9 | 23.6 | 8.6 | 7.7 | 13 | 13 | 11.8 | 7.2 | 8.2 | 11.3 | 5.9 |
| 36 | Carapicuiba, Brazil | 19.4 | 9.2 | 11.3 | 11.2 | 17 | 20.8 | 28.9 | 28.2 | 28.8 | 38.5 | 13.6 | 11.5 | 10.5 | 14.7 | -- | -- | -- | -- | -- | -- |
| 37 | Sabaneta, Colombia | 19.3 | 22.7 | 22 | 32.6 | 24.3 | 14.8 | 13.6 | 14.5 | 16.7 | 19.9 | 14.7 | 11.4 | 47.5 | 17 | -- | -- | -- | -- | -- | -- |
| 38 | Chillan, Chile | 19.2 | 7.4 | 8.8 | 9.8 | 19.5 | 47.9 | 27.2 | 44.1 | 28.6 | 16.5 | 8.7 | 4.6 | 5.7 | 22.5 | 19.1 | 22.7 | 16 | 20.4 | 21.5 | 27.7 |
| 39 | Puente Alto, Chile | 19.2 | 10.9 | 10.6 | 12.2 | 16.2 | 24.4 | 19.8 | 36.7 | 26 | 18.9 | 17.8 | 16.6 | 19.7 | 20.8 | 19.7 | 22.7 | 20.6 | 23.5 | -- | -- |
| 40 | San Antonio, Chile | 19.2 | 22.8 | 23.1 | 23.2 | 18.4 | 22.8 | 15.8 | 23.2 | 14 | -- | 15.5 | 16.9 | 15.7 | 17.2 | 17.2 | -- | -- | -- | -- | -- |
| 41 | Xapuri, Brazil | 19.1 | 4.7 | 4.5 | 3.7 | 2.1 | 1.9 | 3.2 | 2.2 | -- | 111.7 | 27.8 | 7.4 | 4.7 | 21 | -- | -- | -- | -- | -- | -- |
| 42 | Talagante, Chile | 18.8 | 11.2 | 11.4 | 11.6 | 13 | 35.9 | 34.3 | 49.8 | 20.4 | 13.6 | 9.4 | 7.7 | 9.6 | 22.3 | 27 | 29.4 | -- | 22.7 | -- | -- |
| 43 | Manoel Urbano, Brazil | 18.7 | 3.8 | 4.7 | 3.5 | 3.7 | 3.9 | 8.4 | 19.5 | 46.6 | 85.7 | 15.5 | -- | 2.8 | 11.5 | 29.5 | 18.1 | 15.9 | -- | -- | -- |
| 44 | Santa Rosa do Purus, Brazil | 18.7 | 3.1 | 3.6 | 3.2 | 3.8 | 2.1 | 7 | 17.5 | 43 | 76.9 | 15.5 | 4 | 2.9 | 9.4 | -- | -- | -- | -- | -- | -- |
| 45 | Hualpen, Chile | 18.7 | 10.8 | 10 | 10.4 | 16 | 39.9 | 25.1 | 43.5 | 28.5 | 13.7 | 9.4 | 8.5 | 9.4 | 16.8 | 27.4 | -- | -- | -- | -- | -- |
| 46 | La Estrella, Colombia | 18.6 | 19.4 | 19.6 | 30.3 | 22.5 | 14.6 | 13.2 | 15.5 | 17.5 | 20.6 | 15 | 11.9 | 59 | 17.8 | -- | -- | -- | -- | -- | -- |
| 47 | Talcahuano, Chile | 18.5 | 9.7 | 9.5 | 8.7 | 16.8 | 45.4 | 27.2 | 41.6 | 26.9 | 11.4 | 9.3 | 6.8 | 7.4 | 17.2 | 19.6 | 20.1 | 19 | 21.4 | 15.7 | 21.3 |
| 48 | Rengo, Chile | 18.5 | 11.5 | 8 | 9.1 | 15.7 | 33.9 | 35.2 | 49.7 | 26.4 | 16.5 | 8 | 5.6 | 7 | 16.6 | 18.8 | 16.8 | 18.8 | 24.1 | 18.9 | 16.3 |
| 49 | Quilpue, Chile | 18.5 | 15.6 | 15.9 | 17.9 | 16.1 | 32.8 | 26.4 | 39.8 | 17.7 | 11.8 | 10.1 | 8.5 | 9.6 | 19.9 | 39.1 | -- | -- | -- | -- | -- |
| 50 | Villa Alemana, Chile | 18.5 | 14.5 | 17.3 | 20.4 | 20.5 | -- | -- | 52.2 | 22 | 15.1 | 12.1 | 10.8 | 10.4 | 19.7 | 33 | 14.2 | -- | -- | -- | -- |
