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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3476 |  South Lake Tahoe USA | 4.9 | 4.5 | 5 | 6.3 | 23.5 | 10.9 | 5.1 | -- | -- |
| 3477 | Sunnyvale USA | 4.9 | 4.7 | 5.9 | 7.9 | 7.9 | 10.2 | 6.6 | -- | -- |
| 3478 | Aguilar USA | 4.9 | 5 | 4.6 | 3.6 | -- | -- | -- | -- | -- |
| 3479 | Breckenridge USA | 4.9 | 4 | 3.2 | 2.6 | 10.5 | -- | -- | -- | -- |
| 3480 | Castle Pines USA | 4.9 | 5.2 | 4.9 | 3 | 9.8 | -- | -- | -- | -- |
| 3481 | Towaoc USA | 4.9 | 4.2 | 3.9 | -- | -- | -- | -- | -- | -- |
| 3482 | Twin Lakes USA | 4.9 | 5.3 | 6.6 | 5.7 | 12.1 | -- | -- | -- | -- |
| 3483 | Marco Island USA | 4.9 | 4.6 | -- | -- | -- | -- | -- | -- | -- |
| 3484 | Miami USA | 4.9 | 5.1 | 6.7 | 6.4 | 5.6 | 7.9 | 7.8 | -- | -- |
| 3485 | Challis USA | 4.9 | 8.8 | 4.4 | 13.5 | 3.8 | -- | -- | -- | -- |
| 3486 | Dayton USA | 4.9 | 4.4 | -- | -- | -- | -- | -- | -- | -- |
| 3487 | Idaho Falls USA | 4.9 | 5.3 | 5.4 | 6.2 | 8.3 | 7.1 | 7.2 | 8.1 | 7.5 |
| 3488 | Plymouth USA | 4.9 | 5.4 | 7.1 | -- | -- | -- | -- | -- | -- |
| 3489 | Gardiner USA | 4.9 | 8 | -- | -- | -- | -- | -- | -- | -- |
| 3490 | Rudyard USA | 4.9 | 4 | -- | -- | -- | -- | -- | -- | -- |
| 3491 | Scottsbluff USA | 4.9 | 5.9 | 6.2 | 4.1 | 6.4 | -- | -- | -- | -- |
| 3492 | Gardnerville USA | 4.9 | 4.7 | 4.8 | 5.8 | 19.7 | 11.3 | 5.3 | -- | -- |
| 3493 | Spanish Springs USA | 4.9 | 5.3 | 5 | 6.8 | -- | -- | -- | -- | -- |
| 3494 | Hillsborough USA | 4.9 | 9 | -- | -- | -- | -- | -- | -- | -- |
| 3495 | Peterborough USA | 4.9 | 3.9 | 5.4 | 4.4 | 5.9 | 4 | 4 | 4.1 | 3.8 |
| 3496 | Woodbury USA | 4.9 | 4.4 | 9.5 | 5.8 | -- | -- | -- | -- | -- |
| 3497 | Otisville USA | 4.9 | 4.4 | 9.4 | 6.5 | 9.7 | -- | -- | -- | -- |
| 3498 | Eugene USA | 4.9 | 4.6 | 6.8 | 9.2 | 6.7 | 14 | 8.8 | 7.1 | 8.8 |
| 3499 | Mosier USA | 4.9 | 4.7 | 6.6 | 7.5 | -- | -- | -- | -- | -- |
| 3500 | Portland USA | 4.9 | 4.3 | 6.2 | 9.9 | 7 | 11.2 | 8.1 | 6.9 | 7 |
| 3501 | Wilsonville USA | 4.9 | 4.8 | 6.8 | 9.2 | 7.9 | 15.5 | 9.5 | -- | -- |
| 3502 | Vermillion USA | 4.9 | 6.6 | 8.7 | 5.3 | 9.7 | -- | 6.6 | -- | -- |
| 3503 | Brigham City USA | 4.9 | 6.5 | 6.2 | 6.3 | 10.2 | 8.5 | 6.6 | 8.7 | 7.7 |
| 3504 | Granite USA | 4.9 | 6.5 | 6 | 6.2 | 7.4 | -- | -- | -- | -- |
| 3505 | Kamas USA | 4.9 | 5.7 | 4.2 | 4 | 8.4 | 6.3 | 3.9 | -- | -- |
| 3506 | Naples USA | 4.9 | 6 | 4.3 | -- | -- | -- | -- | -- | -- |
| 3507 | Santa Clara USA | 4.9 | 4.8 | 3.1 | 2 | 5 | 5.5 | -- | -- | -- |
| 3508 | Tremonton USA | 4.9 | 6.6 | 6.1 | 6.8 | 10.7 | 9 | 5.9 | -- | -- |
| 3509 | Underhill Flats USA | 4.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 3510 | Centreville USA | 4.9 | 5.2 | 10.2 | 11.3 | 14.2 | 11.9 | 13.7 | -- | -- |
| 3511 | Great Falls USA | 4.9 | 5 | 8.6 | 10 | 12.8 | -- | -- | -- | -- |
| 3512 | Cle Elum USA | 4.9 | 3.4 | 5.6 | 5.4 | 7 | -- | 5.1 | -- | -- |
| 3513 | Federal Way USA | 4.9 | 4.4 | 6.3 | 9.7 | 6.9 | 9.1 | 7.6 | -- | -- |
| 3514 | Kenmore USA | 4.9 | 4.4 | 7 | 10.7 | 6.2 | -- | -- | -- | -- |
| 3515 | Lacey USA | 4.9 | 4.3 | 5.6 | 9.3 | 5.8 | 7.8 | 6.6 | 6.4 | 6.5 |
| 3516 | Steilacoom USA | 4.9 | 3.7 | 5.3 | 8.5 | 5.9 | -- | -- | -- | -- |
| 3517 | Evanston USA | 4.9 | 4.9 | 3.7 | 3 | 11 | -- | -- | -- | -- |
| 3518 | Sheridan USA | 4.9 | 7.1 | 5.6 | 6.7 | 11.2 | -- | -- | -- | -- |
| 3519 |  Agassiz Canada | 4.8 | 4.6 | 2.1 | 7.7 | 5.5 | -- | -- | -- | -- |
| 3520 | Clinton Canada | 4.8 | 5.6 | 10.7 | 10.7 | -- | -- | -- | -- | -- |
| 3521 | Delta Canada | 4.8 | 3.5 | 3.8 | 4.2 | 4.1 | 5 | 5 | -- | -- |
| 3522 | Saltspring Island Canada | 4.8 | 4.5 | 5.3 | -- | -- | -- | -- | -- | -- |
| 3523 | Sidney Canada | 4.8 | 5.4 | 6.5 | -- | -- | -- | -- | -- | -- |
| 3524 | Hartland Canada | 4.8 | 2.7 | -- | -- | -- | -- | -- | -- | -- |
| 3525 |  El Paraiso Mexico | 4.8 | 5.5 | 7.1 | -- | -- | -- | -- | -- | -- |
