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World's most polluted cities 2019 (PM2.5)
The most polluted cities according to data aggregated from over 60,000 data points.
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2019
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World air quality report
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2019 World air quality report
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PM2.5 Legend 
WHO target
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
Unit: µg/m³
| Rank | City | 2019 AVG | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2018 AVG | 2017 AVG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Coyhaique, Chile | 41.5 | 6.2 | 11.3 | 20.3 | 39.9 | 55.6 | 84.4 | 104.9 | 62.7 | 40.3 | 22.4 | 12.3 | 10.4 | 34.2 | 39.3 |
| 2 | Osorno, Chile | 32.8 | - | - | 9.5 | 40.7 | 53.3 | 62 | 63.6 | 40.5 | 21.7 | 16.6 | 9.4 | 6 | 38.2 | 30.8 |
| 3 | Padre las Casas, Chile | 32.5 | 5.8 | 10.3 | 13 | 35.6 | 63 | 48.5 | 59.4 | 60 | 34.9 | 23.2 | 11.5 | 6.7 | 43.3 | 38.8 |
| 4 | Providencia, Chile | 29.5 | - | 12.1 | 20.6 | 37.8 | 33 | 44.4 | 61.6 | 38.3 | 24.1 | 17.5 | 12.2 | 9.1 | - | - |
| 5 | Santiago, Chile | 27.7 | 21.1 | 19.2 | 17.7 | 31.7 | 33.5 | 45.4 | 56.6 | 35.8 | 19 | 17.3 | 14.6 | 14.6 | 29.4 | 23.1 |
| 6 | Linares, Chile | 27.6 | 7.4 | 9.5 | 14.6 | 36.7 | 56.8 | 46.1 | 59.2 | 39.6 | 18.8 | 9.8 | 8.7 | 8.5 | 25.5 | 27.1 |
| 7 | Pudahuel, Chile | 27.6 | 17.6 | 17.3 | 14.9 | 22.1 | 30.6 | 48 | 59.8 | 36.7 | 18.8 | 16.8 | 15.2 | 14.9 | - | - |
| 8 | Rancagua, Chile | 26.9 | 9.6 | 13.9 | 16.5 | 27.9 | 39.9 | 50.5 | 62 | 34.9 | 18.2 | 13 | 11 | 12.1 | 22.9 | 23.3 |
| 9 | Puerto Montt, Chile | 26.4 | 8 | 12 | 16.1 | 27.9 | 37.2 | 53.2 | 46.2 | 38.8 | 23.4 | 16 | 14.8 | 9.5 | 22.6 | 29.6 |
| 10 | Los Cerrillos, Chile | 26.2 | 17 | 15.9 | 15.9 | 29.4 | 31.9 | 44.7 | 55.5 | 33.3 | 17.3 | 17.1 | 13.3 | 15.8 | - | - |
| 11 | Curico, Chile | 25.8 | 10.8 | 12.1 | 15.6 | 27.9 | 43 | 46.5 | 55.2 | 34.7 | 18.1 | 10 | 9.2 | 9.9 | 16.8 | 23 |
| 12 | Quilicura, Chile | 25.3 | 17.8 | 17.8 | 17.4 | 30.4 | 29.2 | 37.8 | 51.7 | 32.2 | 17.9 | 16.2 | 14.2 | 13.6 | - | - |
| 13 | La Union, Chile | 24.3 | 6.6 | 8.4 | 11.5 | 27.5 | 39.9 | 52.6 | 45.7 | 35.1 | 20.6 | 14.1 | 9.5 | 6.3 | - | - |
| 14 | Rengo, Chile | 24.1 | 11 | 12.4 | 12.9 | 22.6 | 41.1 | 50.2 | 56.4 | 32.1 | 15.1 | 9.1 | 5.7 | 6.2 | 18.9 | 16.3 |
| 15 |  Lima, Peru | 23.7 | 13.9 | 12.1 | 15.4 | 19.4 | 29.1 | 31.3 | 28.7 | 29.7 | 34.2 | 29.5 | 22 | 19.8 | 28 | 27.7 |
| 16 | Puente Alto, Chile | 23.5 | 15.9 | 15.8 | 16 | 29.8 | 28.9 | 34.2 | 45.3 | 29.7 | 17.1 | 15.2 | 14.2 | 13.4 | - | - |
| 17 | Talagante, Chile | 22.7 | 13.9 | 12.7 | 12.8 | 28 | 27.7 | 37.4 | 47.5 | 27.5 | 13.2 | 14 | 14.1 | 15.8 | - | - |
| 18 |  Sabaneta, Colombia | 22.4 | - | 35 | 31.3 | 23.6 | 18.2 | 19.1 | 17.8 | 22.1 | 19.2 | 19.5 | 23.6 | 22.5 | - | - |
| 19 | Puerto Aysen, Chile | 22 | 5.4 | 4.8 | 12.4 | 20.9 | 32.6 | 54.7 | 44 | 29.1 | 16 | 12.2 | 10 | 8.5 | - | - |
| 20 | Los Angeles, Chile | 21.7 | 7.5 | 11.8 | 20.2 | 27.9 | 43.8 | 37 | 29.2 | 33 | 16.2 | 10.4 | 6.5 | 6.1 | 21.6 | 24.1 |
| 21 | Curanilahue, Chile | 21.6 | 11.8 | 13.7 | 12.7 | 22 | 35.7 | 35.8 | 28.4 | 37.9 | 21.1 | 17.1 | 9.7 | 6.8 | - | - |
| 22 | Itaguei, Colombia | 21.6 | - | 33.6 | 33.1 | 21.4 | 19.4 | 15.9 | 14.8 | 23.1 | 18 | 19.2 | 22.7 | 21.6 | - | - |
| 23 | Talcahuano, Chile | 21.4 | 17 | 20 | 15.8 | 22.1 | 31.3 | 34.4 | 27.2 | 26.7 | 19.7 | 14.5 | 12.5 | 12.7 | 15.7 | 21.3 |
| 24 | San Fernando, Chile | 21 | 11.2 | 12.9 | 12.5 | 19.8 | 38.8 | 41.6 | 47.1 | 26.6 | 13.3 | 8.3 | 5.9 | 5.6 | 15.3 | 18.1 |
| 25 | Chillan, Chile | 20.4 | 7.5 | 12.1 | 19 | 27.1 | 35.3 | 33.5 | 27.1 | 27.5 | 17 | 12.8 | 8.6 | 7.8 | 21.5 | 27.7 |
| 26 | Maule, Chile | 20.3 | 10.7 | 12.2 | 17.9 | 25.6 | 33.7 | 28.2 | 35.1 | 30.9 | 16.1 | 10.6 | 8.1 | 7.2 | 16.1 | 17.1 |
| 27 | Temuco, Chile | 20.2 | 5.7 | 8.3 | 9.9 | 22.7 | 42.1 | 33.7 | 31.6 | 33.1 | 19.4 | 12.6 | 7 | 5.1 | 30.4 | 28.7 |
| 28 |  Campinas, Brazil | 20 | 13 | 10 | 12.6 | 15.8 | 24.7 | 27.7 | 26 | 24.5 | 19.2 | 25.1 | 17.1 | 15.2 | 16 | - |
| 29 | Las Condes, Chile | 19.9 | 25.9 | 22.8 | 18.8 | 27 | 21.8 | 19.5 | 33.1 | 22.3 | 14.7 | 12.4 | 11.7 | 12.8 | - | - |
| 30 | Medellin, Colombia | 19.9 | 23.5 | 32.1 | 30.9 | 19.2 | 17.2 | 13.8 | 12.7 | 20.8 | 16.5 | 16.3 | 20.3 | 18.9 | - | - |
| 31 | Osasco, Brazil | 19.8 | 17.6 | 16.2 | 17.1 | 22.4 | 24.6 | 22.6 | 23.2 | 19.9 | 22.2 | 18.5 | 15.2 | 15.7 | 22.1 | - |
| 32 | Chiguayante, Chile | 19.8 | 10.5 | 12.1 | 11.4 | 21.4 | 34.3 | 32.8 | 31.3 | 29.7 | 19.3 | 12.1 | 7.8 | 7 | 17 | 16.1 |
| 33 | Bello, Colombia | 18.9 | 18.7 | 29.3 | 31.1 | 20.2 | 17.5 | 13.4 | 11.9 | 19.9 | 15.6 | 14.1 | 17.2 | 18 | - | - |
| 34 | Santa Gertrudes, Brazil | 18.8 | 12.9 | 14.5 | 17.9 | 19.4 | 16.9 | 21.2 | 22.3 | 21.6 | 29.2 | 22.7 | 14.3 | 10.7 | - | - |
| 35 | Caldas, Colombia | 18.8 | - | - | - | 21.1 | 18.6 | 16.2 | 16.8 | 25.1 | 18.3 | 16.9 | 18 | 19.5 | - | - |
| 36 | Guarulhos, Brazil | 18.7 | 19.3 | 18 | 12.7 | 21.2 | 22.5 | 24.4 | 22.6 | 15.8 | 18.9 | 18.7 | 12.7 | 12.8 | 21.6 | 17.3 |
| 37 | Trujillo, Peru | 18.1 | - | 12.4 | 16.2 | 18 | 20.9 | 22.4 | 21.9 | 20.3 | 16.6 | 15.7 | 16 | 16.2 | - | - |
| 38 | Envigado, Colombia | 17.8 | - | 30.8 | 30.7 | 19 | 15.6 | 12 | 12.4 | 19.2 | 14 | 14.4 | 16.4 | 16.6 | - | - |
| 39 | Talca, Chile | 17.6 | 9.1 | 9.5 | 15.5 | 21.7 | 29.1 | 25 | 35.2 | 29.7 | 13.4 | 7.3 | 4.5 | 4.5 | 13.7 | 14.3 |
| 40 | La Estrella, Colombia | 17.5 | - | 25.2 | 24.7 | 17.1 | 16 | 12.9 | 13.6 | 21 | 15.7 | 15.4 | 18.2 | 16.9 | - | - |
| 41 | Sao Caetano do Sul, Brazil | 17.2 | 16.8 | 16.3 | 13.8 | 17.6 | 21 | 21.1 | 22.7 | 14.9 | 13 | 16.7 | 12.7 | 13.7 | 18.1 | - |
| 42 | Girardota, Colombia | 17.1 | - | - | - | 16 | 13.3 | 13.7 | 17.2 | 27.8 | 17.1 | 17 | 15.5 | 14.2 | - | - |
| 43 |  Lanus Este, Argentina | 16.8 | 13.1 | 17.4 | 12.6 | 19 | 16.4 | 20.4 | 20.3 | 18.4 | 14.4 | 13.5 | 16.9 | 17.7 | - | - |
| 44 | Sao Bernardo do Campo, Brazil | 16.7 | 20.8 | 13.7 | 13.1 | 17.5 | 16.8 | 18.1 | 20.4 | 15 | 17.4 | 18 | 14.5 | 15 | 16.4 | - |
| 45 | Rio Branco, Brazil | 16 | - | 5.7 | 4.9 | 6.7 | 8.4 | 12.6 | 18.4 | 47.6 | 37 | 9.4 | 6.9 | 4.2 | - | - |
| 46 | Puchuncavi, Chile | 15.9 | 16.5 | 15.6 | 15.2 | 18.9 | 19.1 | 14.8 | 18.2 | 16.6 | 12.8 | 12.4 | 15 | 15.6 | 14.8 | 13.7 |
| 47 | Tome, Chile | 15.7 | 12.9 | 15.4 | 12.8 | 20.9 | 26.6 | 19.1 | 17.9 | 21 | 12.2 | 10.4 | 8.1 | 9.1 | 20.9 | 14.8 |
| 48 | La Greda, Chile | 15.6 | 13.2 | 13.2 | 14.4 | 17.6 | 19.1 | 17.8 | 21.7 | 17.5 | 12.8 | 12.3 | 13 | 12 | - | - |
| 49 | Santos, Brazil | 15.4 | 14.3 | 12.9 | 10.4 | 15.6 | 16.3 | 22.9 | 19.1 | 15.1 | 14.2 | 14.6 | 12.5 | 13.9 | 14.8 | 15.9 |
| 50 | Sao Paulo, Brazil | 15.3 | 14.2 | 11.2 | 11.3 | 15.5 | 16.1 | 19.8 | 20.8 | 15.5 | 17.8 | 15.5 | 11.4 | 11.1 | 16.2 | 16 |
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