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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5627 |  Nampa USA | 7.5 | 11.7 | 7.3 | 12 | 13.2 | 10.2 | 6.7 | 8.6 | 11.2 |
| 5628 | Bedford USA | 7.5 | 6.6 | 8.1 | 10.1 | -- | -- | -- | -- | -- |
| 5629 | Boggstown USA | 7.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 5630 | Kokomo USA | 7.5 | 6.8 | 9 | 8.1 | 7.9 | -- | 8.3 | 8.2 | 8.8 |
| 5631 | Middlebury USA | 7.5 | 7.7 | 12.6 | -- | -- | -- | -- | -- | -- |
| 5632 | Leawood USA | 7.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 5633 | Anchorage USA | 7.5 | 7.2 | -- | -- | -- | -- | -- | -- | -- |
| 5634 | Paducah USA | 7.5 | 6.9 | 9.1 | 9.3 | 9.7 | 8.8 | 9.4 | 9.8 | -- |
| 5635 | Capitol Heights USA | 7.5 | 7.7 | 12.4 | 11.5 | 13.2 | -- | -- | -- | -- |
| 5636 | Keedysville USA | 7.5 | 7.3 | 10.2 | -- | -- | -- | -- | -- | -- |
| 5637 | Birmingham USA | 7.5 | 6.6 | 9.7 | 1.7 | 12.1 | -- | -- | -- | -- |
| 5638 | Byron USA | 7.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 5639 | Fraser USA | 7.5 | 5.8 | 12.8 | 11.5 | 6.7 | -- | 8 | -- | -- |
| 5640 | Duluth USA | 7.5 | 5.4 | 8.4 | 5.1 | 9.1 | 6.3 | 5.8 | 5.6 | 5.5 |
| 5641 | Hastings USA | 7.5 | 8.5 | 9.3 | 7.6 | 12.4 | -- | -- | -- | -- |
| 5642 | Pierz USA | 7.5 | 4.9 | 10.1 | -- | -- | -- | -- | -- | -- |
| 5643 | Prinsburg USA | 7.5 | 7.3 | -- | -- | -- | -- | -- | -- | -- |
| 5644 | Belton USA | 7.5 | 5.9 | 5.9 | 6 | 7 | 6.3 | 6.5 | 6.6 | 7.2 |
| 5645 | Columbia USA | 7.5 | 11.5 | -- | -- | -- | -- | -- | -- | -- |
| 5646 | Clinton USA | 7.5 | 9.5 | 8.5 | -- | -- | -- | -- | -- | -- |
| 5647 | Hamilton USA | 7.5 | 10.6 | 7.7 | 11.2 | 11.6 | 7.8 | 6.3 | 6.9 | 15.5 |
| 5648 | Richland USA | 7.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 5649 | Beatrice USA | 7.5 | 5.9 | 7.2 | 21.8 | 11.6 | -- | -- | -- | -- |
| 5650 | Dakota City USA | 7.5 | 7.8 | -- | -- | -- | -- | -- | -- | -- |
| 5651 | Kearney USA | 7.5 | 7.4 | -- | -- | -- | -- | -- | -- | -- |
| 5652 | Glen Ridge USA | 7.5 | 7.1 | 11.1 | -- | -- | -- | -- | -- | -- |
| 5653 | Hackettstown USA | 7.5 | -- | -- | -- | -- | -- | -- | -- | -- |
| 5654 | Hampton USA | 7.5 | 6.5 | 9.8 | -- | -- | -- | -- | -- | -- |
| 5655 | Paterson USA | 7.5 | 6.7 | 8.4 | -- | -- | -- | -- | -- | -- |
| 5656 | Peekskill USA | 7.5 | 6.5 | 9.7 | -- | -- | -- | -- | -- | -- |
| 5657 | Winston-Salem USA | 7.5 | 7.7 | 11.2 | 10.3 | 10.5 | 9.1 | 12.3 | 7.2 | 7.7 |
| 5658 | Atoka USA | 7.5 | 8.1 | -- | -- | -- | -- | -- | -- | -- |
| 5659 | Red Rock USA | 7.5 | 6.8 | 10.5 | 9 | -- | -- | -- | -- | -- |
| 5660 | Cave Junction USA | 7.5 | 6.1 | 17.1 | 9.7 | 8.9 | 15.3 | 7.5 | 13.3 | 12 |
| 5661 | Grants Pass USA | 7.5 | 6.2 | 11.3 | 11.7 | 10.9 | 12.7 | 8.4 | 12.8 | 13.7 |
| 5662 | Klamath Falls USA | 7.5 | 8.3 | 9 | 7.7 | 21.6 | 16.5 | 9.1 | 18.9 | 13.2 |
| 5663 | Medford USA | 7.5 | 6.9 | 11.4 | 9.4 | 16.4 | 15.8 | 8.7 | 22 | 15 |
| 5664 | Ontario USA | 7.5 | 6.9 | 5.6 | 7.7 | 10.6 | -- | -- | -- | -- |
| 5665 | Phoenix USA | 7.5 | 7.5 | 13.7 | 11.6 | 19.1 | 14.8 | 9.7 | -- | -- |
| 5666 | Coopersburg USA | 7.5 | 6.9 | 11.7 | 10.4 | 12.3 | -- | -- | -- | -- |
| 5667 | Kittanning USA | 7.5 | 6.6 | 9.2 | 9.3 | 9.4 | 8.2 | 8 | -- | -- |
| 5668 | Monessen USA | 7.5 | 5.8 | 10.7 | 11.7 | -- | -- | -- | -- | -- |
| 5669 | Northumberland USA | 7.5 | 7.8 | 11.8 | -- | -- | -- | -- | -- | -- |
| 5670 | Portersville USA | 7.5 | 7 | 10.9 | 9 | -- | -- | -- | -- | -- |
| 5671 | Sewickley USA | 7.5 | 6.8 | 10.8 | 9.9 | 12.6 | -- | -- | -- | -- |
| 5672 | White Haven USA | 7.5 | 7.5 | -- | -- | -- | -- | -- | -- | -- |
| 5673 | Watertown USA | 7.5 | 8 | 9.6 | 7.8 | 8.9 | 10.7 | 7.2 | 7.8 | 7.8 |
| 5674 | Channelview USA | 7.5 | 8.3 | 11.5 | 12.2 | 13.2 | -- | -- | -- | -- |
| 5675 | Decatur USA | 7.5 | 8.4 | -- | -- | -- | -- | -- | -- | -- |
| 5676 | Denton USA | 7.5 | 6.8 | 8.5 | 7.3 | 11.2 | 8.5 | 7.4 | 8.1 | 8.3 |
