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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3628 |  Richmond USA | 4.7 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3629 | Freeland USA | 4.7 | 3.9 | 6 | 8.8 | 4.6 | 6.1 | -- | -- | -- |
| 3630 | Goldendale USA | 4.7 | 4.5 | 6.4 | 7.4 | 8.3 | -- | -- | -- | -- |
| 3631 | Granite Falls USA | 4.7 | 4.3 | 6.8 | 12.2 | -- | -- | -- | -- | -- |
| 3632 | Kalama USA | 4.7 | 4.3 | 7.1 | -- | -- | -- | -- | -- | -- |
| 3633 | Lake Stevens USA | 4.7 | 4.6 | 6.4 | 9.6 | 5.2 | 8.8 | 5.7 | -- | -- |
| 3634 | Longview USA | 4.7 | 4.4 | 5.6 | 6.6 | 4.1 | -- | 5.6 | 6.8 | 8.4 |
| 3635 | Lynnwood USA | 4.7 | 4.2 | 6.5 | 2.7 | 7.4 | 9.6 | 8.7 | 7.1 | 6.7 |
| 3636 | Mattawa USA | 4.7 | 3.3 | 6.1 | -- | -- | -- | -- | -- | -- |
| 3637 | Meadowdale USA | 4.7 | 4.3 | 5.9 | -- | -- | -- | -- | -- | -- |
| 3638 | Newcastle USA | 4.7 | 3.6 | 3.9 | -- | -- | -- | -- | -- | -- |
| 3639 | Shoreline USA | 4.7 | 4.4 | 6.3 | 9.6 | 6.9 | -- | -- | -- | -- |
| 3640 | Sultan USA | 4.7 | 3.8 | 6 | 14.7 | 6.7 | -- | -- | -- | -- |
| 3641 | White Center USA | 4.7 | 4.8 | 6.9 | 10.2 | 6.9 | -- | -- | -- | -- |
| 3642 | Pinedale USA | 4.7 | 4.2 | 3.4 | 3.4 | 6.1 | 3.9 | 3.5 | -- | -- |
| 3643 |  Cobble Hill Canada | 4.6 | 4.3 | 6.3 | 8.1 | 6.6 | 8.2 | 9.2 | -- | -- |
| 3644 | Lake Cowichan Canada | 4.6 | 4.5 | 7.6 | 8.8 | 10.9 | -- | 8.2 | -- | -- |
| 3645 | Pitt Meadows Canada | 4.6 | 4.2 | 4.3 | 4.7 | 4.5 | -- | 5.5 | -- | -- |
| 3646 | Surrey Canada | 4.6 | 4.3 | 5.4 | 6.5 | 4.9 | 6.6 | 5.8 | -- | -- |
| 3647 | Vancouver Canada | 4.6 | 4.2 | 5.5 | 6.7 | 5.8 | 8.1 | 6.1 | 6.3 | 6.6 |
| 3648 | Bathurst Canada | 4.6 | 4.2 | 5.6 | 5.1 | 5.5 | 5.1 | 5.2 | 5.7 | 6 |
| 3649 | Burin Canada | 4.6 | 4.2 | 4.6 | 5.8 | 4.9 | 4.6 | 3.8 | -- | -- |
| 3650 | Mount Pearl Canada | 4.6 | 5.3 | 6.4 | 4.6 | 4.9 | 5.2 | 4.5 | 5.4 | 5 |
| 3651 | Saint-Raymond Canada | 4.6 | 6.6 | -- | -- | -- | -- | -- | -- | -- |
| 3652 | Patagonia USA | 4.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3653 | Superior USA | 4.6 | 5.2 | -- | -- | -- | -- | -- | -- | -- |
| 3654 | Alamo USA | 4.6 | 4.5 | 5.7 | 6.9 | 8.6 | 12.4 | 6.8 | -- | -- |
| 3655 | Castle Hill USA | 4.6 | 4.4 | -- | -- | -- | -- | -- | -- | -- |
| 3657 | Goleta USA | 4.6 | 4.6 | 5.8 | 6.2 | 8.4 | 9.2 | 6.9 | 7.9 | 9.5 |
| 3658 | Lafayette USA | 4.6 | 4.3 | 5.7 | 6.7 | 8 | 11.6 | 6.4 | -- | -- |
| 3659 | Los Olivos USA | 4.6 | 5 | 5.3 | 4.7 | 7.7 | -- | -- | -- | -- |
| 3660 | Morro Bay USA | 4.6 | 4.6 | 8.7 | 7.9 | 6.4 | 8 | 5 | -- | -- |
| 3661 | Nevada USA | 4.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3662 | Palo Alto USA | 4.6 | 4.4 | 5.6 | 7.4 | 7.7 | 10 | 6.5 | -- | -- |
| 3663 | Petaluma USA | 4.6 | 4.3 | 5.7 | 7.2 | 8.1 | 10.2 | 6.7 | -- | -- |
| 3664 | Placer USA | 4.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3665 | San Francisco USA | 4.6 | 4.2 | 5.8 | 8.1 | 8.2 | 9.6 | 7.1 | 12.6 | 10 |
| 3666 | Siskiyou USA | 4.6 | 98.3 | 42 | -- | -- | -- | -- | -- | -- |
| 3667 | Soledad USA | 4.6 | 3.8 | 5 | 3.9 | 7.9 | -- | -- | -- | -- |
| 3668 | South San Francisco USA | 4.6 | 4.2 | 5.8 | 8 | 8.1 | 10.5 | -- | -- | -- |
| 3669 | Alamosa USA | 4.6 | 5.1 | 3 | 2.2 | 6.3 | -- | -- | -- | -- |
| 3670 | Seaview USA | 4.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3671 | Arco USA | 4.6 | 5.5 | 3.3 | -- | -- | -- | -- | -- | -- |
| 3672 | Driggs USA | 4.6 | 5.6 | 4.9 | 7.2 | 12.4 | -- | -- | -- | -- |
| 3673 | Searsport USA | 4.6 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3674 | Barnstable USA | 4.6 | 2.5 | -- | -- | -- | -- | -- | -- | -- |
| 3675 | Chatham USA | 4.6 | 4.2 | 6.7 | 4.3 | -- | -- | -- | -- | -- |
| 3676 | Sandwich USA | 4.6 | 4.5 | 8 | 7.2 | 7.3 | -- | -- | -- | -- |
| 3677 | Lewistown USA | 4.6 | 5.1 | 5.4 | 5.3 | 7.5 | 6.2 | 4.7 | 6.1 | 7.5 |
| 3678 | Dayton USA | 4.6 | 5 | 7.2 | 7.2 | 8.9 | -- | -- | -- | -- |
