Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
2017-2023
World's most polluted cities
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
2023
World Air Quality Report
PM2.5 legend
0-5
Meets WHO guideline
5.1-10
Exceeds by 1 to 2 times
10.1-15
Exceeds by 2 to 3 times
15.1-25
Exceeds by 3 to 5 times
25.1-35
Exceeds by 5 to 7 times
35.1-50
Exceeds by 7 to 10 times
>50.1
Exceeds by over 10 times
Rank | City | 2023 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Cave Junction, USA | 17.1 | 11 | 14.8 | 7.2 | 5.2 | 4.6 | 3 | 12.2 | 90.5 | 28.7 | 6.3 | 11.5 | 9.4 | 9.7 | 8.9 | 15.3 | 7.5 | 13.3 | 12 |
| 2 | La Pine, USA | 14.8 | 14.6 | 12.2 | 10.5 | 7.5 | 8.5 | 4.3 | 28.7 | 44.7 | 13.9 | 9 | 13.4 | 9.4 | 15.7 | 10.1 | -- | -- | -- | -- |
| 3 | Deschutes River Woods, USA | 14.1 | 11.1 | 9.4 | 7.1 | 3.9 | 6.4 | 5.3 | 19.6 | 53.8 | 17.1 | 9 | 14.2 | 10.6 | 20.2 | -- | -- | -- | -- | -- |
| 4 | Phoenix, USA | 13.7 | 9.5 | 10 | 8 | 4.7 | 5.6 | 4.6 | 9.4 | 62.9 | 17.7 | 7.2 | 11.6 | 12.3 | 11.6 | 19.1 | 14.8 | 9.7 | -- | -- |
| 5 | Three Rivers, USA | 12.6 | 4.3 | 4.5 | 4.3 | 3.1 | 7.6 | 5.1 | 25.4 | 50.7 | 14.9 | 6.1 | 10.1 | 8.6 | 10.1 | 8 | -- | -- | -- | -- |
| 6 | McKenzie Bridge, USA | 12.2 | -- | -- | -- | 2.6 | 5.4 | 4.4 | 10.4 | 43 | 26.4 | 7.5 | 4.5 | 4.9 | 9.7 | 4.2 | -- | 6.8 | -- | -- |
| 7 | Joseph, USA | 12 | 24.8 | 19.8 | 14.4 | 8.6 | 7.2 | 6.2 | 7 | 12.1 | 6 | 7.8 | 15.7 | 15 | 27.1 | -- | -- | -- | -- | -- |
| 8 | Terrebonne, USA | 11.8 | 5.4 | 5.2 | 3.9 | 3.3 | 6.8 | 5.8 | 15.6 | 53.2 | 15.5 | 9.9 | 8.8 | 6.5 | 8.2 | 13 | -- | -- | -- | -- |
| 9 | Sisters, USA | 11.7 | 3.4 | 3.3 | 2.9 | 2.5 | 5.1 | 4.2 | 16.7 | 68.5 | 15.6 | 5.8 | 5.7 | 5.6 | 6.8 | 8.9 | 16 | 5.7 | 7.3 | 12 |
| 10 | Depoe Bay, USA | 11.4 | 11.5 | 15.6 | 8.7 | 9.8 | 10 | 9.2 | 7.6 | 13.9 | 17.2 | 11.9 | 11.1 | 11.2 | 1.2 | 11.1 | -- | -- | -- | -- |
| 11 | Medford, USA | 11.4 | 6.5 | 6.9 | 5 | 3.5 | 4.5 | 3.9 | 8.1 | 54.2 | 16.4 | 6.5 | 10.2 | 10.1 | 9.4 | 16.4 | 15.8 | 8.7 | 22 | 15 |
| 12 | Central Point, USA | 11.3 | 6.4 | 7.7 | 6.5 | 4.4 | 4.4 | 4.3 | 7.2 | 53.3 | 15.7 | 6.4 | 9.1 | 8.5 | 10.4 | 20.7 | -- | -- | -- | -- |
| 13 | Grants Pass, USA | 11.3 | 9.4 | 11.5 | 5.8 | 3.3 | 4.6 | 3.5 | 6.1 | 49.9 | 14.9 | 6.4 | 11.9 | 8.3 | 11.7 | 10.9 | 12.7 | 8.4 | 12.8 | 13.7 |
| 14 | Lincoln Beach, USA | 11.2 | 11 | 12.9 | 12.9 | 15 | 8.9 | 12.4 | 10.4 | 13.1 | 12.5 | 9 | 5.3 | 5.3 | 8.7 | 10.1 | -- | -- | -- | -- |
| 15 | Sams Valley, USA | 11.2 | 9.5 | 9.3 | 4.8 | 3 | 4.8 | 4.4 | 6.5 | 43.7 | 17.4 | 6.2 | 10.3 | 10.2 | 10 | -- | -- | -- | -- | -- |
| 16 | Sunriver, USA | 11.1 | 3.6 | 3.5 | 3 | 2.6 | 7.2 | 5.7 | 22.4 | 49.6 | 14.6 | 5.7 | 8.4 | 5.6 | 8.9 | 17 | -- | -- | -- | -- |
| 17 | Diamond Lake, USA | 11 | 9.4 | 9.9 | 7.6 | 6.8 | 8.4 | 7.2 | 11.4 | 38.4 | 10 | 6.4 | 9.3 | 8.6 | 11.4 | -- | -- | -- | -- | -- |
| 18 | Oakridge, USA | 10.8 | 10.5 | 11.4 | 8.8 | 4.6 | 5.2 | 4 | 9.8 | 44 | 9 | 6.8 | 7.3 | 7.4 | 33.5 | 15.9 | 13.3 | 9.7 | 10.5 | 17.5 |
| 19 | Talent, USA | 10.8 | 5.5 | 5.8 | 5 | 3.5 | 4.6 | 3.8 | 8.6 | 56.5 | 15.6 | 5.4 | 7.7 | 7 | 7.5 | 11.2 | -- | 6.7 | -- | -- |
| 20 | Bend, USA | 10.7 | 2.3 | 2.8 | 2.7 | 2.1 | 5 | 4.5 | 19 | 55.5 | 15.3 | 5.8 | 7.3 | 5.3 | 7.4 | 11.3 | 13.6 | 5.8 | 8.4 | 10 |
| 21 | Westfir, USA | 10.4 | 8.8 | 10.1 | 7 | 4.5 | 4.5 | 3.8 | 9.8 | 40.5 | 9.9 | 9.6 | 8.3 | 6.7 | 24.5 | 19.9 | 13.6 | -- | -- | -- |
| 22 | Roseburg, USA | 10.3 | 7.5 | 9.7 | 6 | 4.1 | 4.8 | 3.5 | 4.4 | 37.3 | 16.2 | 10 | 12.6 | 6.7 | 10.8 | 7.7 | 12 | 7.3 | 8.4 | 9.5 |
| 23 | Rogue River, USA | 10.2 | 7.4 | 9.5 | 5.5 | 3.6 | 4.2 | 3.7 | 6.4 | 46.7 | 13.1 | 5.3 | 8.7 | 5.9 | 10.2 | 16 | -- | -- | -- | -- |
| 24 | Jacksonville, USA | 10.1 | 3 | 4.2 | 3.6 | 2.7 | 3.9 | 3.5 | 7.9 | 58.2 | 16.8 | 4.3 | 5.6 | 5 | 8.2 | 13.4 | 17.3 | 9.5 | -- | -- |
| 25 | Redmond, USA | 10.1 | 2.4 | 2.8 | 2.7 | 2.4 | 4.9 | 4.7 | 14 | 53.5 | 14 | 7.2 | 7 | 4.1 | 5.9 | 9.5 | 16.7 | 7.3 | -- | -- |
| 26 | Klamath, USA | 10 | -- | 12.5 | 10 | 5.2 | 9.8 | 6.3 | 12.5 | 32.9 | 11.2 | 3.6 | 3.3 | 3.4 | 3.3 | 19.1 | -- | -- | -- | -- |
| 27 | John Day, USA | 9.9 | 14.8 | 12.1 | 11.3 | 7.4 | 5.1 | 4.8 | 6.1 | 11.2 | 5.9 | 8.1 | 17.7 | 14.6 | 7.6 | 8.8 | 10.8 | 8.9 | 10.6 | 11.1 |
| 28 | Ashland, USA | 9.8 | 3.5 | 3.9 | 3.5 | 3.4 | 4.7 | 3.8 | 8.8 | 54.4 | 14.9 | 4.8 | 5.6 | 5.8 | 7.8 | 15.2 | 12.4 | 6.4 | 14.8 | 10.9 |
| 29 | Eagle Point, USA | 9.8 | 5.6 | 5.8 | 4.1 | 3 | 4.5 | 3.9 | 6.8 | 46.4 | 15.7 | 5.6 | 7.5 | 6.6 | 8.1 | 21.1 | -- | -- | -- | -- |
| 30 | Green, USA | 9.6 | 9.9 | 11.5 | 7 | 4.3 | 4.4 | 3.4 | 3.9 | 28 | 12.3 | 9 | 11.5 | 10.1 | -- | -- | -- | -- | -- | -- |
| 31 | Madras, USA | 9.5 | 9.8 | 8.6 | 4.6 | 3.3 | 4.3 | 4.3 | 8.5 | 30.6 | 9.1 | 9.4 | 11.3 | 10 | 6 | 6.9 | 13.3 | 7.6 | -- | -- |
| 32 | Camp Sherman, USA | 9.3 | 3.1 | 3.5 | 4.1 | 3.2 | 4.9 | 4.9 | 14.1 | 42.9 | 12.2 | 6.3 | 5.1 | 5 | 6.7 | -- | -- | -- | -- | -- |
| 33 | Crescent Lake Juntion, USA | 9.3 | 2.3 | 4.4 | 3.9 | 2.9 | 6.1 | 4.6 | 10.7 | 39.4 | 9.3 | 6.7 | 5.9 | 4.7 | 9.7 | -- | -- | -- | -- | -- |
| 34 | Enterprise, USA | 9.1 | 15.5 | 15.7 | 10.5 | 6.8 | 5.9 | 5.2 | 7.1 | 12.6 | 5.7 | 6.4 | 8.6 | 9.8 | 15 | 7.7 | 8.7 | 6.5 | 8.4 | 8.6 |
| 35 | Klamath Falls, USA | 9 | 5.5 | 5.6 | 4.8 | 2.9 | 5 | 4.6 | 9 | 28.2 | 11.6 | 7 | 10.6 | 12.5 | 7.7 | 21.6 | 16.5 | 9.1 | 18.9 | 13.2 |
| 36 | Boardman, USA | 8.7 | 11.9 | 9.1 | 5 | 3.9 | 6.1 | 5.1 | 6.8 | 25 | 6.5 | 6.5 | 9.9 | 5 | 11.1 | 12.6 | -- | -- | -- | -- |
| 37 | Malin, USA | 8.7 | 7.8 | 7.3 | 4.6 | 3.2 | 5.6 | 5.8 | 9.8 | 23.7 | 10.6 | 7.1 | 10.8 | 7.1 | 8 | 34.5 | -- | -- | -- | -- |
| 38 | Hermiston, USA | 8.6 | 9 | 7.7 | 4.4 | 3.4 | 5.3 | 5.5 | 6.7 | 26.2 | 6.9 | 8.2 | 12.1 | 7.6 | 10.3 | 8.4 | 6.9 | -- | -- | -- |
| 39 | Canby, USA | 8.5 | 9.7 | 11.8 | 7.6 | 3.9 | 6.5 | 4.1 | 5.4 | 12.6 | 6.5 | 11.6 | 14.7 | 6.9 | 11.1 | 9.2 | -- | 10.1 | -- | -- |
| 40 | Chiloquin, USA | 8.5 | 2.2 | 5.5 | 2.3 | 2.4 | 5.7 | 4.1 | 7.8 | 25.6 | 10.9 | 9.1 | 11.2 | 13.8 | 7.7 | -- | -- | -- | -- | -- |
| 41 | Waldport, USA | 8.5 | 5.2 | 7.4 | 5.8 | 6.2 | 8.1 | 8.8 | 8.6 | 13.8 | 13.7 | 10 | 7.8 | 5.6 | 7.4 | 9.6 | -- | -- | -- | -- |
| 42 | Prineville, USA | 8.3 | 3.6 | 3.8 | 3.8 | 2.7 | 4.5 | 4.5 | 12.1 | 34.1 | 11.5 | 7.1 | 7.3 | 3.6 | 6.9 | 10.1 | 11.2 | 7.6 | 9.7 | 11.5 |
| 43 | Burns, USA | 8.2 | 12.6 | 10.5 | 8.2 | 5.7 | 4.8 | 4.5 | 7.9 | 14.8 | 6.6 | 5.4 | 8.6 | 9.6 | 8.9 | 11.8 | 11.6 | 7.7 | 10.1 | 10.8 |
| 44 | Dundee, USA | 8.2 | 7.9 | 10.9 | 6.1 | 4 | 7 | 4.9 | 5 | 16.4 | 6.5 | 9.2 | 10.8 | 5.8 | 10.1 | 7.6 | -- | -- | -- | -- |
| 45 | Athena, USA | 8.1 | 2.5 | 5 | 4 | 2.4 | 5.6 | 5.6 | 6.7 | 26.8 | 6.6 | 6.2 | 7.9 | 6.2 | 8.3 | 7.6 | -- | -- | -- | -- |
| 46 | Coburg, USA | 8.1 | 6.5 | 8.1 | 5.8 | 2.8 | 5.7 | 3.7 | 5 | 19.7 | 7.6 | 10.3 | 12.6 | 6.4 | 9 | -- | -- | -- | -- | -- |
| 47 | Cottage Grove, USA | 8 | 7.4 | 8.2 | 5.7 | 2.9 | 4.8 | 3.4 | 4.8 | 22.4 | 8.6 | 8.9 | 12 | 6.4 | 11 | 7.2 | 17.1 | 9.9 | 8.4 | 11 |
| 48 | Crater Lake, USA | 8 | 6.4 | 2.2 | 3.6 | 7.3 | 3.7 | 3.3 | 7.6 | 27.3 | 14.1 | 3.1 | 2.5 | 2.1 | 7.3 | -- | -- | -- | -- | -- |
| 49 | Gladstone, USA | 8 | 9.9 | 11.2 | 6.8 | 4.4 | 7.7 | 4.1 | 6 | 12.3 | 6.7 | 8.6 | 10 | 5.8 | 11.2 | 8.9 | -- | -- | -- | -- |
| 50 | Arlington, USA | 7.8 | 7.3 | 7.2 | 3.9 | 2.3 | 5.5 | 4.3 | 6 | 25.1 | 6.3 | 5.8 | 10.9 | 6.8 | 7.4 | -- | -- | -- | -- | -- |
1-50 of 143
1
2
3
Jump to page:
Stay Informed. Download #1 air quality app
Rated 4.8Air pollution forecast, pollution alerts and much more to help you plan your days and keep protected against air pollution
AQI US, Metric