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 (concentration in μg/m3 categorized by WHO guideline)
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1657 |  Elkins Park USA | 7.3 | 6.5 | 12 | 10.3 | -- | -- | -- | -- | -- |
| 1658 | Erie USA | 7.3 | 6.4 | 9 | 7.1 | 9.5 | 7.1 | 7.5 | 8.9 | 8.1 |
| 1659 | Friedens USA | 7.3 | 7.9 | 13 | 13.3 | -- | -- | -- | -- | -- |
| 1660 | Jefferson Hills USA | 7.3 | 7.5 | 11 | 11.8 | 13 | -- | -- | -- | -- |
| 1661 | Laurel Lake USA | 7.3 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1662 | Shippensburg USA | 7.3 | 7.5 | 12.4 | 10.7 | -- | -- | -- | -- | -- |
| 1663 | Warwick USA | 7.3 | 6.5 | 7.8 | -- | -- | -- | -- | -- | -- |
| 1664 | Harriman USA | 7.3 | 7.3 | 8.3 | 7 | 7.7 | 6.9 | 7.5 | 7.1 | 8 |
| 1665 | Smithville USA | 7.3 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1666 | Burnet USA | 7.3 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1667 | Cedar Hill USA | 7.3 | 7.9 | 11.6 | 10.4 | 14.9 | -- | -- | -- | -- |
| 1668 | Converse USA | 7.3 | 9.2 | -- | -- | -- | -- | -- | -- | -- |
| 1669 | Elgin USA | 7.3 | 6.4 | 9.1 | 9 | 9.6 | -- | -- | -- | -- |
| 1670 | San Marcos USA | 7.3 | 8.2 | 9.3 | 8.8 | 10.1 | -- | -- | -- | -- |
| 1671 | Timberwood Park USA | 7.3 | 11 | 5.7 | -- | -- | -- | -- | -- | -- |
| 1672 | Manassas USA | 7.3 | 7.2 | 10.4 | -- | -- | -- | -- | -- | -- |
| 1673 | Remington USA | 7.3 | 7.4 | 9.8 | -- | -- | -- | -- | -- | -- |
| 1674 | Warrenton USA | 7.3 | 7.4 | 11.4 | 9.6 | -- | -- | -- | -- | -- |
| 1675 | Oroville USA | 7.3 | 6.1 | 11.5 | 7.8 | 20.8 | -- | -- | -- | -- |
| 1676 | Richland USA | 7.3 | 6.9 | 9.6 | 10.2 | 11.1 | -- | -- | -- | -- |
| 1677 | Twisp USA | 7.3 | 6.1 | 8.7 | 7.6 | 13.6 | 7.8 | 6 | 16.6 | 18.8 |
| 1678 | Waterville USA | 7.3 | 4.9 | 6.5 | 5.9 | 6.8 | -- | -- | -- | -- |
| 1679 | Wellsburg USA | 7.3 | 6.7 | -- | -- | -- | -- | -- | -- | -- |
| 1680 | Wheeling USA | 7.3 | 6.6 | 13.2 | 10.9 | 13.2 | -- | -- | -- | -- |
| 1681 | Baraboo USA | 7.3 | 5.6 | 9.9 | 7.3 | 8.4 | 7.4 | 7.6 | 6.9 | 5.9 |
| 1682 | Mosinee USA | 7.3 | 5.5 | 10.4 | -- | -- | -- | -- | -- | -- |
| 1683 |  Fort Vermilion Canada | 7.2 | 9 | 22.3 | -- | -- | -- | -- | -- | -- |
| 1684 | Lethbridge Canada | 7.2 | 7.2 | 10 | 7.3 | 7.6 | 6.8 | 6.5 | 9.9 | 7.7 |
| 1685 | Nampa Canada | 7.2 | 7.3 | 16.2 | -- | -- | -- | -- | -- | -- |
| 1686 | Castlegar Canada | 7.2 | 7 | 11.1 | 10.2 | 21.1 | 10.8 | -- | -- | -- |
| 1687 | Invermere Canada | 7.2 | 7.6 | 12.9 | -- | -- | -- | -- | -- | -- |
| 1688 | Ottawa Canada | 7.2 | 6 | 9.7 | 6.8 | 8.2 | 7.3 | 7.3 | 6 | 6 |
| 1689 | Port Stanley Canada | 7.2 | 6.7 | 10 | -- | -- | -- | -- | -- | -- |
| 1690 | St. Catharines Canada | 7.2 | 6.3 | 9.6 | 5.8 | 7 | 6.6 | 6.9 | 7.1 | 7.3 |
| 1691 | Hatley Canada | 7.2 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1692 | Dawson City Canada | 7.2 | 7.2 | -- | -- | -- | -- | -- | -- | -- |
| 1693 | Tuscaloosa County USA | 7.2 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1694 | Carmichael USA | 7.2 | 7.3 | 9.4 | 11.8 | 13.3 | -- | -- | -- | -- |
| 1695 | Eucalyptus Hills USA | 7.2 | 7.1 | -- | -- | -- | -- | -- | -- | -- |
| 1696 | Malibu USA | 7.2 | 6.6 | 7.7 | 8.1 | 10.3 | 11.7 | 10.6 | -- | -- |
| 1697 | Manteca USA | 7.2 | 7.7 | 9.5 | 11.1 | 13.1 | 13.5 | -- | -- | -- |
| 1698 | Redwood Valley USA | 7.2 | 6 | 8.3 | 9.5 | 11.1 | 14 | 7.5 | -- | -- |
| 1699 | Simi Valley USA | 7.2 | 7.4 | 8.3 | 8.6 | 11 | 10.7 | 8.9 | 8.9 | 9.4 |
| 1700 | Vista USA | 7.2 | 7.4 | 11 | 8.4 | 11.4 | 13 | 10.8 | -- | -- |
| 1701 | Winter Gardens USA | 7.2 | 7.7 | -- | -- | -- | -- | -- | -- | -- |
| 1702 | Timnath USA | 7.2 | 7.1 | 9.6 | 7.8 | 12.7 | -- | -- | -- | -- |
| 1703 | Bridgeport USA | 7.2 | 6.8 | 9.9 | 8.4 | 8.3 | 8.1 | 7.8 | 8 | 7.3 |
| 1704 | Carmel USA | 7.2 | 7.2 | 11.2 | 10 | -- | -- | -- | -- | -- |
| 1705 | Jeffersonville USA | 7.2 | 8.3 | 11.6 | 10.3 | 11.2 | -- | -- | -- | -- |
| 1706 | Riverside USA | 7.2 | 2.9 | 13.6 | -- | -- | -- | -- | -- | -- |
