World's most polluted cities (historical data 2017-2022)
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
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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 | 2022 | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  San Juan de Lurigancho, Peru | 41.2 | 26.6 | 28.6 | 26.8 | 32.5 | 51.6 | 51.3 | 53.9 | 56.5 | 50.5 | 46.8 | 36.7 | 31.1 | 34 | 22.4 | - | - | - |
| 2 | Vitarte, Peru | 40 | 28 | 27.6 | 26.4 | 37.2 | 59.2 | 62.8 | 65.3 | 50.1 | 43.9 | 40.4 | 29.8 | 23.7 | - | - | - | - | - |
| 3 |  Quilpue, Chile | 39.1 | - | - | - | - | 68.8 | 70.1 | 57.8 | 44.4 | 28 | 17.5 | 15.9 | 18.7 | - | - | - | - | - |
| 4 | Santa Anita, Peru | 38.8 | 20.6 | 21.6 | 22.1 | 31.4 | 52 | 53.7 | 48.4 | 54.1 | 48.2 | 45.2 | 33.9 | 32.1 | 36.2 | - | - | - | - |
| 5 | Coyhaique, Chile | 37.7 | 6 | 6.2 | 17.6 | 33.3 | 99.4 | 129.6 | 69.6 | 35.2 | 21.6 | 16.3 | 8.7 | 7.1 | 36.1 | 33.3 | 41.5 | 34.2 | 39.3 |
| 6 | Carabayllo, Peru | 37.6 | 25.6 | 24.5 | 18.5 | 38.3 | 50.8 | 40.7 | 36.2 | 51.3 | 46.3 | 44.7 | 32.7 | 32.2 | 27.6 | 18.6 | - | - | - |
| 7 | Villa Maria del Triunfo, Peru | 35 | 27.9 | 25.9 | 17.8 | 30.7 | 50.5 | 33.6 | 44.8 | 45 | 33.8 | 35.6 | 37.3 | 34.6 | 26.9 | - | - | - | - |
| 8 | Padre las Casas, Chile | 33.8 | 9 | 12.3 | 16.4 | 38.1 | 77.6 | 76.3 | 52.8 | 56.5 | 33.5 | 19.8 | 7.6 | 4.8 | 37.2 | 28.6 | 32.5 | 43.3 | 38.8 |
| 9 | Villa Alemana, Chile | 33 | 6.7 | 14 | 18.9 | 27 | 69.3 | 73 | 57.3 | 43.2 | 24.6 | 12.8 | 12.9 | 10.2 | 14.2 | - | - | - | - |
| 10 | Traiguen, Chile | 30.1 | 4.8 | 18.2 | 13 | 27.8 | 63 | 67.2 | 53.7 | 44.1 | 34.2 | 19.8 | 10.1 | 5.2 | 30.1 | - | - | - | - |
| 11 | Llaillay, Chile | 29 | 9.5 | 13 | 19.2 | 26.2 | 61.1 | 56.9 | 42 | 49 | 25.7 | 13.8 | 14.4 | 14.7 | 20.9 | - | - | - | - |
| 12 | El Bosque, Chile | 28.3 | 13.1 | 18 | 18.3 | 26.3 | 55 | 56.1 | 44.3 | 41.7 | 25.8 | 13.3 | 12.4 | 14.9 | - | - | - | - | - |
| 13 | Providencia, Chile | 28.2 | 8.1 | 12.9 | 10.2 | 26.7 | 65.1 | 55.2 | 38.9 | 46.4 | 25 | 13.2 | 10.2 | 10.2 | - | - | - | - | - |
| 14 | La Reina, Chile | 27.2 | 9.7 | 14.7 | 16 | 23.3 | 53.7 | 46.7 | 38 | 43.1 | 32 | 16.6 | 14 | 13.2 | - | - | - | - | - |
| 15 | Talagante, Chile | 27 | 11.4 | 14.7 | 15.5 | 22.5 | 57.1 | 65.6 | 43.1 | 36.8 | 20.5 | 11.7 | 10.9 | 12.8 | 29.4 | - | 22.7 | - | - |
| 16 | Temuco, Chile | 26.3 | 5 | 9 | 12 | 26.8 | 65.2 | 62.1 | 41.3 | 40.7 | 26.4 | 13.1 | 7 | 5.5 | 32.7 | 20.6 | 20.2 | 30.4 | 28.7 |
| 17 | Santiago, Chile | 25.8 | 9.1 | 13 | 16.1 | 23.3 | 56.4 | 50.8 | 37.3 | 41.6 | 25.2 | 12.7 | 11.4 | 12.4 | 25.8 | 23.6 | 27.7 | 29.4 | 23.1 |
| 18 | Lima, Peru | 25.6 | 14.6 | 16.2 | 15.2 | 21.7 | 30.6 | 35.9 | 33 | 36.1 | 33.2 | 28.7 | 22.1 | 18.8 | 31.5 | 18 | 23.7 | 28 | 27.7 |
| 19 | Rancagua, Chile | 25.4 | 8.2 | 13.2 | 14.6 | 20.2 | 49.9 | 55.2 | 48.9 | 34.6 | 22.2 | 14.1 | 11.1 | 12 | 25.4 | 23.8 | 26.9 | 22.9 | 23.3 |
| 20 | Vitacura, Chile | 24.8 | 9 | 13.3 | 15.9 | 24.9 | 65.5 | 48.7 | 33.4 | - | 42.5 | 14.2 | 12.6 | 12.5 | - | - | - | - | - |
| 21 | Coronel, Chile | 24.7 | 7.6 | 12.7 | 12 | 26.1 | 56.9 | 43.7 | 41.5 | 40.6 | 23.2 | 12.2 | 9.8 | 9.2 | 33.3 | 20.7 | 11.8 | 19 | 22.9 |
| 22 | Quilicura, Chile | 24.5 | 11.5 | 14.2 | 17.5 | 19 | 52.4 | 50.1 | 34.9 | 35.6 | 20.8 | 12.2 | 12.3 | 13.2 | 25.5 | 22.3 | 25.3 | - | - |
| 23 | Lo Barnechea, Chile | 24.4 | 10.2 | 12.6 | 16.3 | 23.1 | 54.2 | 39.8 | 30.8 | 41.6 | 26.9 | 12.7 | 12.6 | 11.4 | - | - | - | - | - |
| 24 | San Martin de Porres, Peru | 23.5 | 14.4 | 18.8 | 19 | 20.6 | 30.1 | 31.2 | 28 | 30.5 | 28 | 25.6 | 19.7 | 16.1 | 17.6 | - | - | - | - |
| 25 |  Acrelandia, Brazil | 23.3 | 6.6 | 4.5 | 2.2 | 4.1 | 6.2 | - | 21.3 | 41.6 | 96.3 | 21.8 | 18.1 | 6.3 | 28 | - | - | - | - |
| 26 | Nacimiento, Chile | 22.4 | 8.2 | 18.5 | 10.4 | 21 | 48.9 | 45 | 29.3 | 40 | 19.3 | 11.2 | 9.7 | 10.3 | 26.2 | 27.3 | - | - | - |
| 27 | Las Condes, Chile | 21.6 | 11.3 | 13.5 | 14.3 | 19.6 | 43.8 | 35.6 | 27.6 | 34.1 | 23.4 | 12.1 | 12.3 | 11.3 | 18 | 15.4 | 19.9 | - | - |
| 28 | Concepcion, Chile | 20.6 | 5.8 | 11.7 | 10.4 | 19.4 | 46.6 | 37 | 32 | 34.8 | 23.1 | 9.5 | 8 | 8 | 17.7 | 13 | 14.9 | 19.6 | - |
| 29 | San Fernando, Chile | 20.5 | 6.2 | 11 | 12.3 | 16.5 | 37.2 | 46 | 38.6 | 30.9 | 22.1 | 9.6 | 9 | 9.6 | 21.5 | 17.7 | 21 | 15.3 | 18.1 |
| 30 |  Bucaramanga, Colombia | 20.5 | 24.8 | 27.4 | 22.4 | 21.3 | 19.6 | 17.9 | 17.6 | 22.3 | 20 | 17.2 | 18.7 | 20.9 | 19.4 | - | - | - | - |
| 31 | Puerto Maldonado, Peru | 20.5 | 12.9 | 12.5 | 9.2 | 13.2 | 18.6 | 21.6 | 28.1 | 31.9 | 54.4 | 20.6 | 22.4 | 10.4 | 13 | - | - | - | - |
| 32 | Puerto Varas, Chile | 20.3 | 8.1 | 6.3 | 15.6 | 21.3 | 29.5 | 33.7 | 29.6 | 38.7 | 32.1 | 20.6 | 11.3 | 7.6 | 18.2 | - | - | - | - |
| 33 | Porto Velho, Brazil | 20.2 | 6.2 | 3.8 | 3.6 | 5 | 13 | 16.4 | 28.2 | 52.7 | 61.2 | 22.4 | 23.7 | 6.5 | 22.1 | - | - | - | - |
| 34 | Puente Alto, Chile | 19.7 | 8.8 | 13 | 12.6 | 18.4 | 39.4 | 35.9 | 27.7 | 30.4 | 18.5 | 10.3 | 10.6 | 11 | 22.7 | 20.6 | 23.5 | - | - |
| 35 | Talcahuano, Chile | 19.6 | 8.1 | 14.1 | 12.8 | 19.1 | 43.2 | 34.9 | 32.7 | 24.4 | 17.4 | 9.6 | 9.4 | 8.8 | 20.1 | 19 | 21.4 | 15.7 | 21.3 |
| 36 | Concepcion, Peru | 19.5 | 11.6 | 8.4 | 9.3 | 17.8 | 19.2 | 24.4 | 34.8 | 26.3 | 29.3 | 20.4 | 23 | 22.5 | 12.9 | - | - | - | - |
| 37 | Chillan, Chile | 19.1 | 6.3 | 17.7 | 11.6 | 17 | 39.9 | 37.8 | 33 | 29.4 | 17.6 | 9 | 5.6 | 4.1 | 22.7 | 16 | 20.4 | 21.5 | 27.7 |
| 38 | Placilla, Chile | 18.9 | 8 | 10.7 | 9.4 | 15.2 | 40 | 36.5 | 23 | 24.4 | 14.4 | 7.3 | 9.5 | 21.4 | 18 | - | - | - | - |
| 39 | Rengo, Chile | 18.8 | 6.5 | 9.1 | 10.2 | 15 | 34.2 | 41.1 | 30.1 | 31.8 | 20.1 | 9.7 | 9.4 | 11.7 | 16.8 | 18.8 | 24.1 | 18.9 | 16.3 |
| 40 | Senador Guiomard, Brazil | 18.7 | - | 3.5 | 2.5 | 4.7 | 10.7 | 11.2 | 18.3 | 36.7 | 73.5 | 19.5 | 19.6 | 5.4 | 12.9 | - | - | - | - |
| 41 | Puerto Aysen, Chile | 18.7 | 9.4 | 8.1 | 15 | 23.2 | 32.2 | 40.4 | 32 | 26.2 | 19.3 | 12.8 | 6.5 | 6.9 | 17.4 | 17.6 | 22 | - | - |
| 42 | El Tambo, Peru | 18.7 | 13.3 | 9.9 | 10.6 | 17.6 | 16.8 | 17.9 | 22.5 | 24.9 | 30.2 | 20.7 | 22.9 | 18 | 15 | - | - | - | - |
| 43 | Rio Branco, Brazil | 18.2 | 4.5 | 3.4 | 3.4 | 5.4 | 12.4 | 13.7 | 20.1 | 40.6 | 75.8 | 18.2 | 19.3 | 3.7 | 12.6 | 14.7 | 16 | - | - |
| 44 | Puerto Montt, Chile | 17.9 | 4.8 | 3.1 | 10.9 | 21.4 | 26.9 | 33 | 30.7 | 35.5 | 22.3 | 14.3 | 9 | 7 | 16.6 | 18.9 | 26.4 | 22.6 | 29.6 |
| 45 | Quillota, Chile | 17.7 | 5.8 | 10.1 | 13 | 15.6 | 34.7 | 36 | 22.4 | 28.6 | 17.8 | 8.9 | 8.6 | 10.5 | 18.9 | - | - | - | - |
| 46 | Valparaiso, Chile | 17.7 | 7.1 | 11.5 | 15.4 | 15.6 | 41.6 | 30.8 | 19.9 | 26 | 16.1 | 9.3 | 8.4 | 9.7 | 14.2 | 12.9 | 14.4 | 13.4 | 13.8 |
| 47 | Brasileia, Brazil | 17.6 | 7.9 | 5.6 | 3.5 | 6.5 | 12.6 | 14.9 | 19.5 | 28.9 | 62.7 | 20.3 | 22.6 | 6.2 | 15.4 | 18.6 | - | - | - |
| 48 | Linares, Chile | 17.5 | 5.4 | 15.8 | 13.5 | 19.5 | 38.2 | 30.7 | 29.8 | 25.7 | 20.2 | 8.7 | 8 | 6.8 | 17.9 | 18.7 | 27.6 | 25.5 | 27.1 |
| 49 | Barra Mansa, Brazil | 17.2 | - | - | - | - | 17.2 | 20.2 | 24 | 20.9 | 18.8 | 17 | 10.2 | 9.2 | - | - | - | - | - |
| 50 | Cubatao, Brazil | 17.1 | 17.4 | 14.3 | 15.4 | 14.6 | 18.6 | 19.1 | 26.4 | 19.5 | 15.1 | 17.4 | 11.5 | 13.4 | 17 | - | - | - | - |
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