2017-2025
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
2025
World Air Quality Report
2025
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
25.1-35Exceeds by 5 to 7 times
35.1-50Exceeds by 7 to 10 times
>50.1Exceeds by over 10 times
| Rank | City | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8615 |  Northborough USA | 4.5 | 3.9 | 6.5 | 4.3 | -- | -- | -- | -- | -- |
| 8616 | Peabody city USA | 4.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 8617 | Big Sky USA | 4.5 | 6.4 | 4.7 | 4.5 | 14.4 | -- | -- | -- | -- |
| 8618 | Livingston USA | 4.5 | 6.6 | 6.1 | 4.7 | 12 | -- | -- | -- | -- |
| 8619 | Santa Fe USA | 4.5 | 4.5 | 2.9 | 2.8 | 5 | 4.7 | 3.4 | 3.7 | -- |
| 8620 | Ardmore USA | 4.5 | 5.6 | 8.7 | 8 | 10.4 | -- | -- | -- | -- |
| 8621 | Bunker Hill USA | 4.5 | 4.2 | 6.6 | 14.3 | -- | -- | -- | -- | -- |
| 8622 | Camas USA | 4.5 | 4.3 | 6.1 | 9 | 6.1 | -- | -- | -- | -- |
| 8623 | Marysville USA | 4.5 | 4.4 | 6.5 | 10.9 | 7.1 | 9.2 | 8.9 | 8.2 | 8.3 |
| 8624 | Mercer Island USA | 4.5 | 3.7 | 5.6 | 9.8 | 6.3 | -- | -- | -- | -- |
| 8625 | Monroe USA | 4.5 | 3.8 | 5.5 | 10.7 | 6.3 | 10.4 | 9.1 | -- | -- |
| 8626 | Olympia USA | 4.5 | 4 | 5.6 | 9.2 | 6.2 | 8.9 | 6 | -- | -- |
| 8627 | Seattle USA | 4.5 | 4.1 | 6 | 9.3 | 6 | 8 | 7.5 | 8.3 | 8.5 |
| 8628 | Stevenson USA | 4.5 | 3.8 | 6.5 | 9 | 8 | -- | -- | -- | -- |
| 8629 | Woods Creek USA | 4.5 | 4 | 5.9 | 10.7 | 7.2 | -- | -- | -- | -- |
| 8630 | Wilson USA | 4.5 | 4.9 | 1.9 | 0.8 | 7.7 | -- | -- | -- | -- |
| 8631 |  Bathurst Australia | 4.4 | 5.4 | 6.4 | 4.6 | 10.3 | 8.7 | 13.1 | 7 | 6.1 |
| 8632 | Nobby Australia | 4.4 | 4.6 | -- | -- | -- | -- | -- | -- | -- |
| 8633 | Port Melbourne Australia | 4.4 | 5 | 4.5 | 5.2 | 6.3 | 8.9 | 6.9 | -- | -- |
| 8634 |  Chemainus Canada | 4.4 | 4.6 | 6.8 | 9.3 | 8.2 | 9.5 | 9.1 | -- | -- |
| 8635 | Crofton Canada | 4.4 | 4.2 | 4.6 | 5.3 | 4.8 | 7.7 | -- | -- | -- |
| 8636 | Cumberland Canada | 4.4 | -- | -- | -- | -- | -- | -- | -- | -- |
| 8637 | Gibsons Canada | 4.4 | 3.8 | 5.5 | 6.4 | 5.3 | 7 | 6.2 | 9.5 | 9.6 |
| 8638 | Madeira Park Canada | 4.4 | 4.3 | 7.3 | 9 | 7.9 | 8.4 | 8.5 | -- | -- |
| 8639 | Oak Bay Canada | 4.4 | 3.9 | 5.4 | 7 | 6.3 | -- | -- | -- | -- |
| 8640 | Grand Falls-Windsor Canada | 4.4 | 4.7 | 5.2 | 4.4 | 4.4 | -- | 3.6 | -- | -- |
| 8641 | Shelburne Canada | 4.4 | 3.8 | 6 | -- | -- | -- | -- | -- | -- |
| 8642 | Sydney Canada | 4.4 | 5.1 | 4.9 | 4.3 | 4.8 | 4.8 | 4.9 | 4.6 | 6.5 |
| 8643 | Saint Peters Canada | 4.4 | 4 | 4.9 | -- | -- | -- | -- | -- | -- |
| 8644 | Pemonca Canada | 4.4 | 4.9 | 6 | -- | -- | -- | -- | -- | -- |
| 8645 |  Palmse Estonia | 4.4 | 4.3 | 4.1 | 6.5 | 5.6 | 6.8 | 6.3 | 8 | 4 |
| 8646 |  Raisio Finland | 4.4 | 4.3 | 4.6 | 4.4 | 4.8 | -- | -- | -- | -- |
| 8647 | Pietarsaari Finland | 4.4 | 4.5 | 4.9 | 4.4 | 4.1 | -- | -- | -- | -- |
| 8648 |  Boo Sweden | 4.4 | 4.6 | 5.6 | 6.3 | 8.4 | -- | -- | -- | -- |
| 8649 | Fairbanks USA | 4.4 | 4.6 | 4.9 | 9.5 | 5.4 | 5 | 10.4 | 7.7 | 8.5 |
| 8650 | Farmers Loop USA | 4.4 | 4.8 | 5.6 | 9.3 | 5.3 | -- | -- | -- | -- |
| 8651 | Juneau USA | 4.4 | 3.9 | 3.4 | 2.9 | 4.5 | -- | 7.4 | 7 | 7.1 |
| 8652 | Alamo Lake USA | 4.4 | 4.2 | 2.5 | 4.4 | -- | -- | -- | -- | -- |
| 8653 | Benson USA | 4.4 | -- | -- | -- | -- | -- | -- | -- | -- |
| 8654 | Angwin USA | 4.4 | 3.3 | 4.1 | 3.2 | 7.4 | 10 | 5.2 | -- | -- |
| 8655 | Berkeley USA | 4.4 | 4.2 | 5.8 | 7.8 | 7.7 | 9.9 | 7.1 | -- | -- |
| 8656 | Boyes Hot Springs USA | 4.4 | 4 | 8.1 | 8.3 | -- | -- | -- | -- | -- |
| 8657 | Cloverdale USA | 4.4 | 3.4 | 4.6 | 4.3 | 6.6 | -- | -- | -- | -- |
| 8658 | Cupertino USA | 4.4 | 4.1 | 5.1 | 6.1 | 7.1 | 9.4 | 5.6 | -- | -- |
| 8659 | Daly City USA | 4.4 | 3.8 | 5 | 7.4 | 8.2 | -- | -- | -- | -- |
| 8660 | Ferndale USA | 4.4 | 3.9 | 7 | -- | -- | -- | -- | -- | -- |
| 8661 | Foster City USA | 4.4 | 4.3 | 5.8 | 8.2 | 8.5 | 11.3 | 7 | -- | -- |
| 8662 | Hillsborough USA | 4.4 | 3.8 | 4.9 | 6.1 | 6.9 | 11.5 | 6.4 | -- | -- |
| 8663 | La Selva Beach USA | 4.4 | 4.2 | 6.3 | 8.4 | 8.4 | -- | -- | -- | -- |
| 8664 | Loyola USA | 4.4 | 4 | 5.4 | 7.1 | 7.7 | -- | -- | -- | -- |
