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 |  Whitecourt, Canada | 48.4 | 21.9 | 9.8 | 9 | 5.3 | 27.9 | 6 | 18.7 | 90.1 | 77.1 | 5.5 | 119.2 | 184.6 | 32.7 | 15 | 10.6 | -- | -- | -- | -- |
| 2 |  Ajalpan, Mexico | 24.3 | 19.3 | -- | -- | 48.3 | 72.5 | 43.8 | 12.3 | 12.8 | 9.9 | 10.2 | 13.1 | 12.7 | 24.3 | 28.1 | -- | -- | -- | -- | -- |
| 3 | Cuidad Benito Juarez, Mexico | 23.2 | 22.1 | 20.8 | 22.4 | 26.8 | 41.2 | 25.6 | 21.9 | 16.9 | 16.2 | 19.7 | 24.4 | 20.8 | -- | -- | -- | -- | -- | -- | -- |
| 4 | Celaya, Mexico | 21.6 | 27.8 | 25.1 | 26.4 | 30.4 | 33.8 | 20.7 | 18.2 | 16.9 | 10.8 | 11.7 | 18 | 16.7 | 24.2 | 19.2 | 19.3 | 18.6 | 20 | 20.1 | 22.2 |
| 5 |  South Padre Island, USA | 21.6 | 20.5 | 16.9 | 24.7 | 36.2 | 50 | 24.7 | 17.4 | 9.3 | 13 | 14.9 | 14.9 | 13.7 | 11.6 | 10.3 | 11.1 | 12.1 | 9.5 | 9 | 8.4 |
| 6 |  Villa Nueva, Guatemala | 21.1 | -- | -- | -- | 38 | 59.4 | 23.6 | 11.2 | 10.1 | 18.8 | 14.8 | 16.6 | 10.1 | -- | -- | -- | -- | -- | -- | -- |
| 7 | Alvaro Obregon, Mexico | 20.9 | -- | -- | -- | -- | 25.9 | 20.2 | 18.7 | 16.9 | 19.9 | 18.8 | 24 | 26 | -- | -- | -- | -- | -- | -- | -- |
| 8 | Ciudad Apodaca, Mexico | 20.3 | 24.6 | 23.7 | 19 | 21.5 | 37.2 | 18.6 | 15.3 | 14.2 | 14.2 | 14.9 | 17.8 | 25.8 | 22.3 | -- | -- | -- | -- | -- | -- |
| 9 | General Escobedo, Mexico | 20.3 | 24.3 | 20.1 | 17.5 | 19.1 | 32.8 | 18 | 17.3 | 15.5 | 14 | 18.6 | 23.4 | 24.1 | 19.8 | 21.6 | 23.1 | 18.9 | 20.9 | -- | -- |
| 10 | Morelia, Mexico | 20.2 | 9.7 | 12.9 | 15.6 | 21.9 | 31.4 | 29.8 | 23.9 | 21 | 17.9 | 18.6 | 23.9 | 23.6 | 21.6 | 19.9 | 21.9 | -- | 16.5 | -- | -- |
| 11 | Santa Catarina Pinula, Guatemala | 20 | 13.5 | 16.3 | 34.9 | 42.6 | 56 | 15.1 | 10.3 | 9.5 | 9.2 | 9.4 | 11.8 | 7.4 | 18.5 | 9.5 | -- | -- | -- | -- | -- |
| 12 | Guadalupe, Mexico | 19.7 | 24.9 | 22.6 | 18.9 | 21.4 | 32 | 17.6 | 18.2 | 13.8 | 13 | 16.7 | 20.8 | 23.2 | 17.9 | 17.2 | 22.1 | 19.1 | 17.1 | -- | -- |
| 13 | Mexico City, Mexico | 19.5 | 16.5 | 18.2 | 25.6 | 24.6 | 31.5 | 18 | 15.5 | 13.5 | 15.8 | 14.9 | 18.2 | 21.8 | 22.3 | 22.1 | 21.7 | 18.8 | 20.5 | 19.7 | 20.4 |
| 14 | San Nicolas de los Garza, Mexico | 19.3 | 24.4 | 20 | 18.1 | 20.4 | 34.9 | 16 | 15.1 | 12.8 | 13.5 | 15.7 | 19 | 21.3 | 19.3 | 20.2 | 20.1 | 20.1 | 20.8 | -- | -- |
| 15 | Guatemala City, Guatemala | 18.9 | 15.9 | 20.1 | 32.4 | 35.7 | 47.4 | 16.4 | 7.2 | 7.1 | 13.1 | 11.3 | 12 | 8.1 | 18.7 | 18.5 | 19.5 | -- | -- | -- | -- |
| 16 | Ciudad de Mexico, Mexico | 18.8 | 15.1 | 15.7 | 18.6 | 15.3 | 23.9 | 13.6 | 20 | 51.6 | 12 | 11.3 | 12.7 | 14.4 | 15.7 | -- | -- | -- | -- | -- | -- |
| 17 | Silao, Mexico | 18 | 22.8 | 19.2 | 21.8 | 9.6 | 23 | 16.4 | 11.6 | 12 | 9.8 | 15.1 | 25.4 | 25.9 | 17.3 | 16.4 | 18.6 | 19 | -- | -- | -- |
| 18 | Leon, Mexico | 17.8 | 15.7 | 18.2 | 15.6 | 19.2 | 25.5 | 18.4 | 12.2 | 14.3 | 13.2 | 15.9 | 23.2 | 21.2 | 17.3 | 17 | 16.6 | 19 | 20.9 | 20.8 | 27.3 |
| 19 | Guadalajara, Mexico | 17.7 | 23.5 | 17.3 | 17.4 | 19.1 | 23.7 | 20.2 | 10.2 | 12.2 | 9.1 | 15.5 | 21.1 | 22.9 | 25.8 | 26.7 | 25.4 | 24.5 | 18.9 | -- | -- |
| 20 |  Nindiri, Nicaragua | 17.6 | 14.8 | 16.1 | 24.8 | 24.6 | 24.2 | 14.2 | 15.4 | 14.9 | 14.3 | 15.7 | 17.6 | 15.2 | 16.8 | 9.7 | 10.2 | -- | -- | -- | -- |
| 21 | El Chol, Guatemala | 17.4 | 15.4 | 17.7 | 30.5 | 29.2 | 38.3 | 12.5 | 10.6 | 8.6 | 11.3 | 12.2 | 10.4 | 9.3 | 18.6 | 14.2 | 17 | 19.2 | -- | -- | -- |
| 22 | Puebla, Mexico | 17.4 | -- | 21.4 | 20.3 | 23.7 | 35.1 | 19.6 | 10.7 | 9.6 | 8.9 | 9.9 | 17.1 | 17.6 | 19.3 | 13 | 9.8 | 13 | -- | -- | -- |
| 23 |  San Salvador, El Salvador | 17.3 | 15.8 | 16.9 | 25.3 | 27.9 | 30.9 | 11.9 | 15.2 | 14.2 | 12.1 | 12 | 12 | 12 | 19.2 | 13.4 | 12 | -- | -- | -- | -- |
| 24 | Ciudad de Allende, Mexico | 17.2 | 15.1 | 14.8 | 15.7 | 19.2 | 33 | 16 | 12.2 | 13.3 | 13.4 | 14.7 | 18.6 | 20.4 | 16.1 | 13.9 | -- | -- | -- | -- | -- |
| 25 | Santa Catarina, Mexico | 17.1 | 21.5 | 17.4 | 15.6 | 17.4 | 29.9 | 14.8 | 15.7 | 12.8 | 12.1 | 11.4 | 16.8 | 19.6 | 18.6 | 21.5 | 21.9 | 20.7 | 22.6 | -- | -- |
| 26 |  Santa Lucia, Honduras | 16.9 | 4.4 | 7.1 | 21.2 | 39.9 | 86 | 5.1 | 2 | 3 | 3.6 | 4.6 | 3.5 | 1.5 | 15.2 | 8.2 | 6.1 | -- | -- | -- | -- |
| 27 | Irapuato, Mexico | 16.8 | 19.4 | 19.8 | 16.9 | 19.4 | 24.9 | 14.8 | 9 | 10.4 | 5.5 | 11.1 | 24.3 | 25.8 | 15.8 | 18.1 | 17.9 | 18.2 | 19.2 | 19.7 | 23.2 |
| 28 | Salamanca, Mexico | 16.8 | 20.5 | 18.6 | 18.9 | 23.9 | 22.4 | 14.7 | 10.3 | 11.4 | 12.2 | 12.3 | 19 | 17.2 | 21.3 | 20 | 19.6 | 18 | 20.9 | 20.9 | 25.1 |
| 29 | Clearwater, Canada | 16.7 | 43.5 | 40.6 | 40 | 10.6 | 6.7 | 3.5 | 12.1 | 12.4 | 7.2 | 9.9 | 17.7 | 14.9 | -- | -- | -- | -- | -- | -- | -- |
| 30 | La Union, El Salvador | 16.5 | 14.2 | 14.4 | 23.5 | 30.9 | 32 | 8.2 | 14.4 | 10.7 | 8.5 | 10.5 | 9.7 | -- | 19.5 | 14.2 | 11.2 | -- | -- | -- | -- |
| 31 | San Bernardino Tlaxcalancingo, Mexico | 16.4 | 18.5 | 17.6 | 19.5 | -- | 32.7 | 19.7 | 8.7 | 9.9 | 10 | 10.7 | 19 | 12.6 | -- | -- | -- | -- | -- | -- | -- |
| 32 | Buffalo Narrows, Canada | 16.3 | -- | -- | -- | -- | 8.9 | 2.7 | 51 | 31.9 | 19.9 | 3 | 4.3 | 5.6 | -- | -- | -- | -- | -- | -- | -- |
| 33 | San Pedro Sula, Honduras | 16.1 | 10.6 | 9.7 | 18.6 | 20.3 | 70.2 | 8.4 | 10.8 | 8.3 | 8.9 | 11.3 | 10.7 | 11.9 | 20.2 | -- | -- | -- | -- | -- | -- |
| 34 | San Luis de la Paz, Mexico | 16.1 | 13.4 | 13.7 | 15.4 | 22 | 30 | 16.2 | 11 | 11.9 | 11.7 | 11.4 | 19.2 | 16.8 | 14.2 | 13.9 | 11.1 | 10.9 | 11.9 | -- | -- |
| 35 | Shafter, USA | 16.1 | 19.7 | 10.6 | 8.4 | 12.2 | 10 | 12 | 14.9 | 12.3 | 12.3 | 14.6 | 22.7 | 37.5 | 11.9 | 12.4 | 19.3 | 21.9 | 10.7 | -- | -- |
| 36 | Cuernavaca, Mexico | 15.9 | 9.2 | 10.4 | 19.8 | 27 | 31.2 | 18.5 | 9.3 | 10 | 11.8 | 13.9 | 16.3 | 14.6 | 18.8 | 16.6 | 18.7 | 19.6 | 22.8 | -- | -- |
| 37 | Monterrey, Mexico | 15.6 | 17.6 | 17 | 15.9 | 17.3 | 29.3 | 13.3 | 11.4 | 10.4 | 10.4 | 11.6 | 15.6 | 17.6 | 17.1 | 18.1 | 20.1 | 14.5 | 19.3 | 17.2 | 15.7 |
| 38 | Cadereyta Jimenez, Mexico | 15.5 | 16.4 | 15.5 | 14.9 | 18.2 | 28.3 | 13.3 | 11.3 | 11.9 | 12.3 | 13.2 | 14.6 | 16.8 | 15.4 | 14.8 | 22 | 22.4 | -- | -- | -- |
| 39 | Garcia, Mexico | 15.3 | 29.1 | 19.5 | 13.4 | 15.7 | 27.3 | 16.6 | 11.6 | 8.8 | 7.7 | 10.2 | 12.3 | 11.6 | 20.6 | 24.6 | 19.9 | 23.9 | 24.3 | -- | -- |
| 40 | Burns, USA | 15.3 | 11.7 | 7.1 | 5.1 | 4 | 3.7 | 4 | 73.7 | 21.5 | 21.9 | 8.4 | 8.3 | 13.2 | 8.2 | 8.9 | 11.8 | 11.6 | 7.7 | 10.1 | 10.8 |
| 41 | Tegucigalpa, Honduras | 15.2 | 6.1 | 8.8 | 23.1 | 38.7 | 70.7 | 5.3 | 2.9 | 3.6 | 5 | 5.3 | 4.9 | 3.2 | 15.1 | 10.2 | 11.8 | -- | -- | -- | -- |
| 42 | Guadalupe Victoria, Mexico | 14.9 | 24.7 | 18.3 | 13.7 | 11.7 | 9.9 | 9.2 | 8.3 | 8.5 | 12.1 | 14.9 | 20.9 | 31.1 | 18.2 | 43 | 19.6 | -- | -- | -- | -- |
| 43 | Antigua Guatemala, Guatemala | 14.5 | 13.5 | 17.3 | 24 | 24.9 | 31.4 | 11.1 | 5.8 | 7 | 9.4 | 7.6 | 12 | 7.1 | 17.1 | 20.3 | 22.4 | -- | -- | -- | -- |
| 44 | Mexicali, Mexico | 14.5 | 26.3 | 14.1 | 8.3 | 8.9 | 9.1 | 8.4 | 8.4 | 7.8 | 10.2 | 15.1 | 21.5 | 35.4 | 13.8 | 14.4 | 15.9 | 19.7 | 17.7 | 30.2 | 22.7 |
| 45 | San Pedro Garza Garcia, Mexico | 14.3 | 15.8 | 14.9 | 14.7 | 16.4 | 26.7 | 12.7 | 11.1 | 9.9 | 9.8 | 9.8 | 14.1 | 15.6 | 16.6 | 19 | 20.8 | 15.6 | 16.6 | -- | -- |
| 46 | Tlalixtac de Cabrera, Mexico | 14.3 | 9.8 | 11.4 | 18.6 | 25.1 | 30.5 | 19.2 | 8.4 | 8.6 | 8.4 | 8.1 | 11.6 | 11.8 | 16.1 | 15.6 | 11.7 | -- | -- | -- | -- |
| 47 | Ontario, USA | 14.3 | 13 | 9.7 | 7.6 | 10.6 | 13.6 | 14.7 | 15.9 | 13.6 | 18.1 | 18.6 | 12.8 | 24 | 13.4 | 15.1 | 18.8 | 17.6 | 16 | -- | -- |
| 48 | Patzcuaro, Mexico | 14.2 | 10.4 | 12.9 | 13.8 | 19.2 | 27 | 17 | 7.9 | 8.9 | 8.3 | 13 | 15.5 | 17.5 | 18.6 | 21.1 | 21.1 | 18 | 20.8 | -- | -- |
| 49 | Garden Valley, USA | 14.2 | 11.2 | 4.7 | 3.9 | 3.9 | 4.1 | 4.5 | 22.8 | 50.3 | 26.3 | 17.3 | 7.3 | 12.9 | 6.4 | 6.7 | 9.8 | 9.5 | 7.2 | 8 | 10.3 |
| 50 | Gilmer, USA | 14.2 | 38.3 | 103.2 | 19 | 4.9 | 8.5 | 5.9 | 5 | 8.5 | 6.8 | 8 | 7.7 | 6.8 | 6.7 | 1 | 13.1 | -- | -- | -- | -- |
