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2017-2023
World's most polluted cities
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
2023
World Air Quality Report
PM2.5 legend
0-5
Meets WHO guideline
5.1-10
Exceeds by 1 to 2 times
10.1-15
Exceeds by 2 to 3 times
15.1-25
Exceeds by 3 to 5 times
25.1-35
Exceeds by 5 to 7 times
35.1-50
Exceeds by 7 to 10 times
>50.1
Exceeds by over 10 times
Rank | City | 2023 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 51 |  Quillota, Chile | 16.2 | 10.1 | 19.9 | 11.1 | 14.6 | 27 | 27.6 | 24.4 | 16.3 | 12.1 | 11.9 | 9 | 10.2 | 17.7 | 18.9 | -- | -- | -- | -- |
| 52 | Osorno, Chile | 16.1 | 3.6 | 5.3 | 10.9 | 19.4 | 29.8 | 31 | 29.8 | 28.8 | 22.9 | 14.2 | 7.4 | 3.8 | 17.1 | 17.9 | 19.2 | 32.8 | 38.2 | 30.8 |
| 53 |  Guarulhos, Brazil | 16 | 10.5 | 10.3 | 12.8 | 11.8 | 18.6 | 21.3 | 19.8 | 20.3 | 19.6 | 13.1 | 16.2 | 15.9 | 15 | 16.1 | 16.4 | 18.7 | 21.6 | 17.3 |
| 54 | Sao Caetano do Sul, Brazil | 15.9 | 11.2 | 10.6 | 14 | 12.4 | 17.9 | 20.9 | 18.9 | 18.9 | 18.3 | 13.4 | 16.8 | 15.6 | 13.9 | 15.5 | 15 | 17.2 | 18.1 | -- |
| 55 | Talca, Chile | 15.9 | 6.3 | 34.7 | 10.4 | 16.8 | 27.2 | 24.4 | 28.4 | 20.6 | 7.5 | 6.3 | 4.5 | 4.4 | 15.9 | 17.2 | 14.6 | 17.6 | 13.7 | 14.3 |
| 56 |  San Cristobal, Colombia | 15.7 | -- | 29.7 | 21.7 | 16.1 | 15.8 | 12.8 | 12.5 | 14.5 | 15.9 | 18.2 | 14.1 | 18.8 | -- | -- | -- | -- | -- | -- |
| 57 | Rio Claro, Brazil | 15.5 | 7.6 | 8.9 | 11.5 | 12.1 | 20.4 | 20.7 | 20.4 | 22 | 20.3 | 14 | 14.6 | 12.3 | 14.9 | 16.7 | 17.8 | -- | -- | -- |
| 58 | Concepcion, Chile | 15.5 | 6.6 | 20.2 | 8.2 | 14.2 | 25.6 | 24.8 | 28 | 23.3 | 14.8 | 9.3 | 5.2 | 4 | 20.6 | 17.7 | 13 | 14.9 | 19.6 | -- |
| 59 | Medellin, Colombia | 15.5 | 16.2 | 23 | 21.1 | 15.3 | 15 | 11.7 | 12 | 14.4 | 15.8 | 15.4 | 11.5 | 14.7 | 15.9 | 15.6 | 19.1 | 19.9 | -- | -- |
| 60 | Cubatao, Brazil | 15.4 | 13.6 | 14 | 15.7 | 12 | 19.8 | 20 | 18.9 | 22.3 | 19.6 | 10.5 | 10.1 | 10 | 17.1 | 17 | -- | -- | -- | -- |
| 61 | Curanilahue, Chile | 15.2 | 7.1 | 10.4 | 8.9 | 16.8 | 25.4 | 23.6 | 31.3 | 24.3 | 15.3 | 8.7 | 6.3 | 6.6 | 15.3 | 16.1 | 15.4 | 21.6 | -- | -- |
| 62 | Bello, Colombia | 15.2 | -- | 31.7 | 21.5 | 15.7 | 15.5 | 12.6 | 12.5 | 13.8 | 15.1 | 18.2 | 14.4 | 16.4 | -- | -- | -- | -- | -- | -- |
| 63 | Valparaiso, Chile | 15.1 | 10.9 | 21.9 | 13.2 | 14.3 | 22.4 | 21.5 | 17.8 | 12.5 | 10.1 | 10.9 | 9.2 | 10.8 | 17.7 | 14.2 | 12.9 | 14.4 | 13.4 | 13.8 |
| 64 | Acrelandia, Brazil | 15 | 3.4 | 4.8 | 4.7 | 4.2 | -- | 11 | 17.5 | 33.2 | 43.2 | 30.5 | 14.6 | 3.5 | 23.3 | 28 | -- | -- | -- | -- |
| 65 | Campinas, Brazil | 15 | 9.5 | 9.9 | 12.1 | 12.1 | 18 | 19 | 19.4 | 21.5 | 17.4 | 13.5 | 13.7 | 13.1 | 15.5 | 16.4 | -- | 20 | 16 | -- |
| 66 | Tome, Chile | 15 | 8.1 | 25.6 | 8.6 | 14.4 | 21.3 | 19.8 | 19.8 | 16.2 | 10.1 | 9.5 | -- | 8.2 | 13.2 | 13.8 | 11.5 | 15.7 | 20.9 | 14.8 |
| 67 | Puchuncavi, Chile | 15 | 13.6 | 22.6 | 13 | 14.3 | 21.3 | 18.1 | 16.9 | 13.1 | 12.4 | 12.6 | 10.8 | 12 | 15.2 | 15.4 | 14 | 15.9 | 14.8 | 13.7 |
| 68 | Maua, Brazil | 14.6 | 9.4 | 9.9 | 13.5 | 10.8 | 16.6 | 22.4 | 18.7 | 19.9 | 13.5 | 9.4 | 7.7 | 14.3 | 13.6 | 13.7 | -- | -- | -- | -- |
| 69 | Puerto Montt, Chile | 14.5 | 3.7 | 4.9 | 9 | 15.7 | 20.6 | 26.4 | 26.7 | 22.7 | 19.2 | 10.5 | 12.3 | 5.8 | 17.9 | 16.6 | 18.9 | 26.4 | 22.6 | 29.6 |
| 70 | Porto Velho, Brazil | 14.3 | 3.4 | 5.2 | 5.3 | 4.6 | 6.5 | 10.5 | 16.7 | 29.6 | 35.6 | 28.8 | 18.3 | 4.3 | 20.2 | 22.1 | -- | -- | -- | -- |
| 71 | Sao Paulo, Brazil | 14.3 | 9.7 | 10 | 12.6 | 11.3 | 16.9 | 18.9 | 17.9 | 19.6 | 17.5 | 12 | 12.1 | 11.7 | 13.5 | 14.8 | 14.2 | 15.3 | 16.2 | 16 |
| 72 | Aysen, Chile | 14.1 | 4.5 | 5 | 11.8 | 15.6 | 23.6 | 27.5 | 32.5 | 20.6 | 12.2 | 6.1 | 8.5 | 4.7 | -- | -- | -- | -- | -- | -- |
| 73 | La Union, Chile | 14 | 3 | 4 | 9.8 | 14.4 | 22.8 | 29.5 | 26.5 | 22.2 | 17.5 | 9.8 | 10.8 | 4.9 | 16.9 | 16.7 | 17.3 | 24.3 | -- | -- |
| 74 | Los Maitenes, Chile | 14 | 13.5 | 25.7 | 19.3 | 16.9 | 19.7 | 13.8 | 11.1 | 10.7 | 9.2 | 10.7 | 9.2 | 11.1 | 11.4 | 12.2 | 11.1 | 13.2 | -- | -- |
| 75 | Girardota, Colombia | 13.5 | 12.9 | 21.6 | 21 | 13.8 | 12.4 | 9.5 | 10.1 | 12.7 | 14.8 | 12.8 | 8.9 | 11.7 | -- | -- | -- | -- | -- | -- |
| 76 | Senador Guiomard, Brazil | 13.4 | 3.2 | 4.5 | 4.2 | 3.4 | 5 | 9.1 | 17.5 | 28.8 | 37.4 | 26.2 | 12.2 | 3.9 | 18.7 | 12.9 | -- | -- | -- | -- |
| 77 | Bogota, Colombia | 13.4 | 15.8 | 20 | 21.1 | 16.6 | 11.4 | 6.9 | 7.5 | 9.7 | 11.3 | 14.4 | 11.9 | 14.9 | 15.1 | 13.7 | 14.3 | 13.1 | 13.9 | 15.7 |
| 78 | Santos, Brazil | 13.1 | 10.6 | 11.6 | 12.7 | 10.7 | 14.3 | 15.3 | 16 | 15 | 13.6 | 7.8 | 11 | 16.5 | 12.1 | 12 | 13.7 | 15.4 | 14.8 | 15.9 |
| 79 | Quintero, Chile | 13.1 | 10.4 | 19.8 | 11.5 | 13.6 | 21.6 | 16 | 13.7 | 11.6 | 10.6 | 11 | 9.1 | 9.8 | 14.1 | 16.3 | 16 | 14.8 | -- | -- |
| 80 | Vina del Mar, Chile | 13.1 | 9.8 | 22 | 13.6 | 14.1 | 19.1 | 17.5 | 15.5 | 12.2 | 7.8 | 8.8 | 7.8 | 9.1 | 16.2 | 14.3 | 12.1 | 13.8 | 11.9 | 9.6 |
| 81 |  La Merced, Peru | 13.1 | 6 | 6.7 | 4.8 | 5.6 | 7.2 | 11.6 | 17.2 | 28.7 | 32.9 | 12.9 | 4.3 | -- | 14.6 | 7.2 | -- | -- | -- | -- |
| 82 | Ribeirao Preto, Brazil | 13 | 6.5 | 6.8 | 8.9 | 10.3 | 16.8 | 15.8 | 15.5 | 19.8 | 17.3 | 13.5 | 12.3 | 9.4 | 13 | 11.8 | 7.2 | 8.2 | 11.3 | 5.9 |
| 83 | Tambopata, Peru | 12.8 | 7.7 | 6.7 | 5.7 | 7 | 6.5 | 11.1 | 17 | 33.1 | 29.8 | 15.4 | 6.1 | 3.7 | 16.4 | 17.1 | -- | -- | -- | -- |
| 84 |  La Paz, Bolivia | 12.6 | 1.2 | 1.7 | 1 | 3.6 | 4.5 | 7.8 | 10.3 | 15.7 | 22.3 | 28.4 | 18.1 | 4.5 | 7.3 | 5.5 | -- | -- | -- | -- |
| 85 | Jundiai, Brazil | 12.6 | 7.8 | 7.9 | 10.4 | 9.9 | 14.4 | 15.4 | 16 | 17.7 | 15.7 | 11.6 | 12.2 | 11.6 | 12.5 | 13.1 | 14 | -- | -- | -- |
| 86 | Valdivia, Chile | 12.6 | 2.7 | 5.3 | 7 | 16.1 | 22.9 | 18.5 | 22 | 20.2 | 14.2 | 11.3 | 7.1 | 4.6 | 14.9 | 12.7 | 13.5 | 14.5 | 33.3 | 33.5 |
| 87 | Trujillo, Peru | 12.6 | 13 | 12.8 | 11.8 | 11.9 | 16.8 | 17.2 | 15.8 | 15.5 | 11.8 | 8.7 | 7.6 | 7.8 | 16.2 | 16.9 | 16.4 | 18.1 | -- | -- |
| 88 | Curacavi, Chile | 12.5 | 5.4 | 22.9 | 8.2 | 13.7 | 19.2 | 19.5 | 18.6 | 16 | 10.3 | 7.7 | 5.5 | 6.4 | 14 | 7.1 | -- | -- | -- | -- |
| 89 | Coquimbo, Chile | 12.4 | 9.3 | 18.8 | 10.1 | 12.2 | 18 | 16.4 | 14.4 | 11.7 | 11 | 10.1 | 8.7 | 9.1 | 10.5 | 12.2 | 10.6 | 12 | 12.8 | 17.1 |
| 90 | Manizales, Colombia | 12.4 | 13.6 | 21.5 | 15.3 | 13.1 | 12.6 | 9.7 | 12.1 | 10.7 | 14.4 | 8.8 | 7.2 | 10.3 | 15.1 | -- | -- | -- | -- | -- |
| 91 | Concon, Chile | 12.3 | 10.6 | 17 | 11 | 12.5 | 18.5 | 17.6 | 14.8 | 10.8 | 11 | 8.5 | 8 | 7.9 | 14.2 | 14.4 | 12.4 | 14.1 | -- | -- |
| 92 | Sucre, Bolivia | 12.2 | 2.2 | 5 | 4.8 | 2 | 9.9 | 12 | 11 | 12.1 | 16.1 | 23.3 | 21.6 | 5.6 | 14.1 | -- | -- | -- | -- | -- |
| 93 | Moquegua, Peru | 12 | 11.3 | 11.8 | 9.4 | 14.8 | 15.7 | 13.8 | 16.5 | 15.7 | 11.3 | 8.8 | 8.2 | 8.8 | 12.2 | -- | -- | -- | -- | -- |
| 94 | Rio Branco do Sul, Brazil | 11.9 | 3.1 | 4.6 | 4.2 | 3.7 | 5.1 | 10.5 | 16.9 | 24.8 | 30.6 | 20.9 | 9.5 | 2.7 | -- | -- | -- | -- | -- | -- |
| 95 | Curitiba, Brazil | 11.9 | 8.7 | 7.9 | 10.1 | 9.8 | 20 | 20.3 | -- | 17.6 | 16.2 | 8.1 | 8.1 | 6.8 | 12 | 12 | -- | -- | -- | -- |
| 96 | Huasco, Chile | 11.9 | 8.7 | 10.7 | 8.5 | 8.9 | 14.7 | 13.5 | 18.4 | 18 | 11.9 | 10.7 | 9.7 | 9 | 9.3 | 11.5 | 10.3 | 10.3 | 11.5 | 12.3 |
| 97 | Rio Branco, Brazil | 11.8 | 1.6 | 3.6 | 3.8 | 3 | 5 | 7.9 | 16.2 | 26.2 | 34.7 | 23.5 | 10.9 | 2.6 | 18.2 | 12.6 | 14.7 | 16 | -- | -- |
| 98 | Piracicaba, Brazil | 11.8 | 6.4 | 7.5 | 9.5 | 9.5 | 13.6 | 13.3 | 14.6 | 16.4 | 15.6 | 11.7 | 11.6 | 10.6 | 11.6 | 13.3 | 13.7 | 13.4 | 13.6 | 12.5 |
| 99 | Rio de Janeiro, Brazil | 11.7 | 7.7 | 9 | 10.1 | 8.6 | 10.8 | 16.1 | 14.1 | 13.9 | 14.1 | 11.1 | 13.8 | 11.7 | 10.6 | 13 | -- | -- | -- | -- |
| 100 |  Montevideo, Uruguay | 11.7 | 7.8 | 10.9 | 8.6 | 12 | 15.6 | 20.4 | 12.7 | 14.8 | 11.1 | 8.8 | 8.5 | 8.8 | 11.3 | 14.2 | -- | -- | -- | -- |
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