World's most polluted cities (historical data 2017-2021)
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
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2021
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2021 Report - English
2021 World air quality report
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Meets WHO guideline
Exceeds by 1 to 2 times
Exceeds by 2 to 3 times
Exceeds by 3 to 5 times
Exceeds by 5 to 7 times
Exceeds by 7 to 10 times
Exceeds by over 10 times
Rank  | City | 2021 | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Angol, Chile | 47.7 | 7.2 | 7 | 3.2 | - | 56.2 | 125.3 | 89.9 | 67.8 | 52.9 | 22.1 | 8.8 | 12 | - | - | - | - |
| 2 | Padre las Casas, Chile | 37.2 | 5.2 | 5.8 | 11.4 | 29.6 | 70.4 | 83.2 | 88.3 | 58.4 | 38.3 | 25.4 | 12.8 | 10.7 | 28.6 | 32.5 | 43.3 | 38.8 |
| 3 | Coyhaique, Chile | 36.1 | 6.5 | 4.5 | 11.4 | 27 | 83.2 | 127.3 | 41.3 | 60.2 | 33.8 | 17.3 | 11.2 | 5.1 | 33.3 | 41.5 | 34.2 | 39.3 |
| 4 |  San Juan de Lurigancho, Peru | 34 | 23.5 | 22.3 | 21.8 | 28.4 | 40.8 | 32.7 | 39.9 | 37.6 | 42.3 | 34.7 | 36.1 | 46.9 | 22.4 | - | - | - |
| 5 | Coronel, Chile | 33.3 | 14.6 | 13.3 | 17.4 | 31.8 | 70 | 65.4 | 76.1 | 46.9 | 25 | 15.2 | 8.7 | 13.3 | 20.7 | 11.8 | 19 | 22.9 |
| 6 | Temuco, Chile | 32.7 | 4.5 | 6.2 | 10.4 | 26.2 | 63.9 | 81 | 80.3 | 50.6 | 33.5 | 19.8 | 8.1 | 6.5 | 20.6 | 20.2 | 30.4 | 28.7 |
| 7 | Lima, Peru | 31.5 | 12.5 | 14.6 | 12.6 | 19.2 | 43.9 | 40.6 | 46.1 | 42.9 | 45.9 | 37.3 | 30.8 | 25.1 | 18 | 23.7 | 28 | 27.7 |
| 8 | Traiguen, Chile | 30.1 | 4 | 5.7 | 12.6 | 22.5 | 46.3 | 64.1 | 64 | 51.3 | 40 | 26.9 | 8.9 | 8.7 | - | - | - | - |
| 9 | Nacimiento, Chile | 26.2 | 8.8 | 8.6 | 12.8 | 27.7 | 52.7 | 106 | 65.9 | 39.3 | 38.8 | 14.9 | 6.8 | 11.3 | 27.3 | - | - | - |
| 10 | Santiago, Chile | 25.8 | 12.3 | 16.1 | 15 | 28 | 43.8 | 41 | 51.1 | 41.9 | 21.8 | 13.9 | 11 | 13.3 | 23.6 | 27.7 | 29.4 | 23.1 |
| 11 | Quilicura, Chile | 25.5 | 12.9 | 12.7 | 13.8 | 23.8 | 42 | 42 | 57.1 | 37.9 | 18.4 | 14 | 12.5 | 15 | 22.3 | 25.3 | - | - |
| 12 | Rancagua, Chile | 25.4 | 11.4 | 11.9 | 12.1 | 17.2 | 38.1 | 46.2 | 65 | 45.6 | 17.3 | 11.4 | 10.4 | 14.1 | 23.8 | 26.9 | 22.9 | 23.3 |
| 13 | La Pintana, Chile | 25.4 | 17.2 | 15.4 | 19.3 | 30.2 | 33.5 | 40 | 52.2 | 38.4 | 17 | 14.7 | 9.8 | 12.6 | - | - | - | - |
| 14 | Chillan, Chile | 22.7 | 7.6 | 8.3 | 12.5 | 19.2 | 47.2 | 47 | 42.9 | 36.2 | 20.2 | 9.8 | 8.4 | 10 | 16 | 20.4 | 21.5 | 27.7 |
| 15 | Puente Alto, Chile | 22.7 | 13.1 | 13 | 14 | 20.7 | 35 | 35.5 | 46.4 | 35.4 | 17.7 | 13.6 | 11.5 | 13.6 | 20.6 | 23.5 | - | - |
| 16 |  Porto Velho, Brazil | 22.1 | 6.5 | 6.3 | 5.3 | 9 | 13.9 | 19.1 | 27.1 | 82.9 | 34.3 | 23.4 | 6.7 | 4.5 | - | - | - | - |
| 17 | San Fernando, Chile | 21.5 | 11.2 | 11.1 | 11.2 | 19.2 | 36 | 45.2 | 44.7 | 36.8 | 16.1 | 10 | 7.8 | 9.1 | 17.7 | 21 | 15.3 | 18.1 |
| 18 | Maule, Chile | 20.6 | 7.8 | 9.9 | 12.2 | 15.9 | 33.4 | 41.7 | 40.5 | 32.2 | 18.2 | 11.4 | 8.8 | 12.7 | 16 | 20.3 | 16.1 | 17.1 |
| 19 | Talcahuano, Chile | 20.1 | 9.4 | 9.6 | 12 | 14.7 | 37.5 | 42.4 | 40.6 | 26.7 | 15.1 | 10.4 | 8 | 12.2 | 19 | 21.4 | 15.7 | 21.3 |
| 20 | Curico, Chile | 19 | 10.9 | 6.7 | 11.1 | 20.9 | 32.2 | 37.6 | 41.2 | 29.2 | 18.8 | 11 | 7.5 | 11.2 | 19 | 25.8 | 16.8 | 23 |
| 21 | Quillota, Chile | 18.9 | 17.4 | 13.8 | 13.6 | 18 | 24.8 | 26 | 38.8 | 30.9 | 13.7 | 10.5 | 9.7 | 9 | - | - | - | - |
| 22 | Puerto Varas, Chile | 18.2 | 9.3 | 8.5 | 13.4 | 18.8 | 23.2 | 23.1 | 30.3 | 27.6 | 23 | 19 | 14.7 | 10.5 | - | - | - | - |
| 23 | Santa Gertrudes, Brazil | 18.1 | 9.7 | 9.9 | 11.7 | 11.2 | 20.9 | 21.1 | 25.3 | 30.7 | 34.9 | 16.6 | 12.9 | 10.2 | 15.9 | 18.8 | - | - |
| 24 | Placilla, Chile | 18 | 7.4 | 8.6 | 10.5 | 17.6 | 31 | 30.3 | 39.7 | 31.5 | 11.4 | 6.5 | 5.4 | 7.5 | - | - | - | - |
| 25 | Las Condes, Chile | 18 | 11.8 | 12.2 | 11.9 | 19.1 | 26.6 | 21.9 | 28.9 | 27.7 | 15.2 | 11.2 | 11.5 | 15 | 15.4 | 19.9 | - | - |
| 26 | Osorno, Chile | 17.9 | 6.1 | 6.3 | 9.8 | 20.1 | 33.7 | 41.1 | 34.4 | 24 | 24.3 | 14.8 | 8.9 | 7.4 | 19.2 | 32.8 | 38.2 | 30.8 |
| 27 | Linares, Chile | 17.9 | 5.8 | 9.2 | 13.3 | 22.6 | 38.6 | 32.4 | 32.8 | 30 | 19.5 | 10.7 | 7 | 7.6 | 18.7 | 27.6 | 25.5 | 27.1 |
| 28 | Placido de Castro, Brazil | 17.8 | 3.7 | 3.7 | 3.3 | 3.3 | 8.6 | 11.1 | 18.5 | 54.1 | 40.9 | 25.2 | 5.8 | - | 15.6 | - | - | - |
| 29 | Concepcion, Chile | 17.7 | 8.8 | 10 | 10.5 | 11.3 | 22 | 28 | 40.9 | 30.6 | 18.8 | 11.7 | 7.9 | 11.5 | 13 | 14.9 | 19.6 | - |
| 30 | Puerto Aysen, Chile | 17.4 | 3.9 | 3 | 8 | 18.2 | 27.8 | 38.7 | 31 | 28.5 | 20.6 | 12.7 | 11.2 | 8.7 | 17.6 | 22 | - | - |
| 31 | Los Angeles, Chile | 17.3 | 6.6 | 5.2 | 10.3 | 16.6 | 31 | 36.8 | 30.3 | 23.6 | 15.1 | 7.8 | 6.9 | 14.8 | 17 | 21.7 | 21.6 | 24.1 |
| 32 | Talca, Chile | 17.2 | 8.5 | 5.8 | 9.3 | 16.5 | 32.5 | 37.6 | 35.1 | 25.7 | 14.1 | 6 | 4.5 | 9.3 | 14.6 | 17.6 | 13.7 | 14.3 |
| 33 | Tambopata, Peru | 17.1 | - | - | 5.2 | 6.4 | 11.6 | 10 | 16.9 | 43.3 | 37.4 | 17.9 | 7.4 | 8 | - | - | - | - |
| 34 | Trujillo, Peru | 16.9 | 12.8 | 15.1 | 14.2 | 17.7 | 20.4 | 19.9 | 20.9 | 18.1 | 18.1 | 17.4 | 14.6 | 13.9 | 16.4 | 18.1 | - | - |
| 35 | Osasco, Brazil | 16.8 | 12.7 | 12.3 | 14.4 | 10.3 | 19.5 | 16.5 | 25.6 | 27.1 | 23.9 | 12.6 | 14 | 11.3 | 16.7 | 19.8 | 22.1 | - |
| 36 | Rengo, Chile | 16.8 | 9.3 | 7.4 | 10.1 | 14.9 | 26.5 | 34.6 | 31 | 29.9 | 13.5 | 9 | 7.2 | 8.6 | 18.8 | 24.1 | 18.9 | 16.3 |
| 37 | Rio Claro, Brazil | 16.7 | 10.3 | 11.3 | 13.4 | 11.1 | 19.6 | 16.4 | 24.3 | 26.5 | 29.8 | 12.1 | 11.7 | 9.8 | 17.8 | - | - | - |
| 38 | La Union, Chile | 16.7 | 4.2 | 4.7 | 6.3 | 15.2 | 32.8 | 39 | 30.9 | 23.6 | 26.3 | 15.7 | 7 | 5.6 | 17.3 | 24.3 | - | - |
| 39 | Puerto Montt, Chile | 16.6 | 5.2 | 6.5 | 8.5 | 17.3 | 27.8 | 33.8 | 29.8 | 25.3 | 19.2 | 13.9 | 8.1 | 5.3 | 18.9 | 26.4 | 22.6 | 29.6 |
| 40 | La Greda, Chile | 16.5 | 12.3 | 14 | 12.1 | 18.4 | 26 | 23.7 | 25.6 | 19.4 | 12.6 | 12.3 | 10.8 | 11 | 14.5 | 15.6 | - | - |
| 41 | Campinas, Brazil | 16.4 | 11.2 | 11.2 | 17 | 13.1 | 23.1 | 18.9 | 23.6 | 26.7 | - | 10.1 | 12 | 11 | - | 20 | 16 | - |
| 42 | Quintero, Chile | 16.3 | 12.3 | 12.4 | 12.1 | 16.1 | 21.9 | 21.3 | 27.6 | 20.8 | 13.8 | 13.9 | 11.3 | 10.9 | 16 | 14.8 | - | - |
| 43 | Guarulhos, Brazil | 16.1 | 11.9 | 11.4 | 13.8 | 11.7 | 20.4 | 16.7 | 25.5 | 24 | 22.8 | 10.2 | 11.9 | 11.4 | 16.4 | 18.7 | 21.6 | 17.3 |
| 44 | Curanilahue, Chile | 16.1 | 7.8 | 6.7 | 11 | 16.5 | 25.2 | 32.3 | 25.2 | 26 | 17.9 | 10.5 | 6.6 | 9.8 | 15.4 | 21.6 | - | - |
| 45 | Chiguayante, Chile | 15.9 | 9.2 | 7.9 | 10.7 | 15.4 | 27.7 | 26.7 | 27.7 | 22.9 | 15.5 | 10.7 | 6.3 | 9.2 | 14.9 | 19.8 | 17 | 16.1 |
| 46 |  Medellin, Colombia | 15.6 | 16.8 | 18.5 | 19.8 | 14.8 | 12.5 | 12.8 | 12.2 | 14.6 | 15 | 15.3 | 17.1 | 17.5 | 19.1 | 19.9 | - | - |
| 47 | Sao Caetano do Sul, Brazil | 15.5 | 13.6 | 12.7 | 15.3 | 9.4 | 19.6 | 15.8 | 20.7 | 21.8 | 22.2 | 10.7 | 12.7 | 10.9 | 15 | 17.2 | 18.1 | - |
| 48 | Brasileia, Brazil | 15.4 | 4.4 | 5 | 5 | 4.7 | 11.9 | 12 | 18.6 | 40.3 | 42.5 | 25.5 | 6.2 | 4.4 | 18.6 | - | - | - |
| 49 | Puchuncavi, Chile | 15.4 | 13.6 | 14 | 12.8 | 14.2 | 19.1 | 17.8 | 22.6 | 18.7 | 13.1 | 13.1 | 12.6 | 12.8 | 14 | 15.9 | 14.8 | 13.7 |
| 50 | Sao Bernardo do Campo, Brazil | 15.2 | 13.7 | 15.3 | 15.4 | 9.7 | 18.3 | 15.1 | 18.8 | 19.5 | 20.2 | 11.3 | 12.4 | 12 | 15.9 | 16.7 | 16.4 | - |
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