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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 350 |  Duncans Mills, USA | 7 | 4.2 | 6.5 | 3.3 | 4.9 | 5.4 | 5.9 | 8.3 | 12.1 | 13.8 | 4.6 | -- | 0.9 | 6.7 | -- | -- | -- | -- | -- |
| 351 | Green Valley, USA | 7 | -- | -- | 2.5 | 2.5 | 4.3 | 5.4 | 8.2 | 11.6 | 10.9 | 4.6 | 6.5 | 7 | 5.6 | 9.3 | -- | -- | -- | -- |
| 352 | Groveland, USA | 7 | 3.1 | 4.6 | 2.7 | 3 | 4.8 | 7.2 | 9.6 | 7.7 | 12.1 | 15.5 | 8.7 | 4.3 | 5.7 | 7.7 | 20.7 | 6.1 | -- | -- |
| 353 | North Fair Oaks, USA | 7 | 4.7 | 6.7 | 4.6 | 3.9 | 5 | 7.4 | 9.5 | 10.4 | 11.3 | 6.2 | 6.3 | 8.2 | 8.2 | 8.5 | -- | -- | -- | -- |
| 354 | North San Juan, USA | 7 | 4.6 | 7.6 | 12.3 | -- | -- | 6.4 | 6.7 | 8.3 | 8.3 | 6.9 | 6.4 | 3.7 | 7.1 | -- | -- | -- | -- | -- |
| 355 | San Miguel, USA | 7 | 4.5 | 7.7 | 4.6 | 6.6 | 5.8 | 9.3 | 9.6 | 9.1 | 12 | 5 | 4.5 | 2.8 | 6.6 | 8.8 | -- | -- | -- | -- |
| 356 | Shasta, USA | 7 | 2.8 | 6.6 | 5.1 | 3.2 | 4.4 | 5.5 | 9.1 | 19.3 | 9.1 | 6.6 | 5.8 | 5.2 | 5.8 | 18.5 | 20.1 | 8.6 | -- | -- |
| 357 | Twain Harte, USA | 7 | 4 | 5 | 3.8 | 3.8 | 5.5 | 9 | 7 | 6.5 | 11.5 | 14.1 | 7.6 | 5.5 | 6.5 | 11.7 | 20.7 | 8.3 | -- | -- |
| 358 | Union City, USA | 7 | 3.9 | 7.4 | 3.1 | 3.8 | 4.5 | 4.6 | 8.6 | 11.3 | 12.6 | 7 | 7.4 | 9.4 | 9.6 | 9.3 | 12.3 | 8.2 | -- | -- |
| 359 | Alpine, USA | 6.9 | 3.7 | 3.7 | 4.7 | 8.8 | 8.7 | 8.2 | 10.5 | 7.9 | 10.4 | 5.5 | 4.7 | 5.5 | 6.7 | 10.7 | 7.7 | 5.9 | 7.6 | 7.4 |
| 360 | Chester, USA | 6.9 | 15.2 | 13.9 | 10.9 | 6.8 | 3.3 | 4.9 | 5.5 | 6 | 5.5 | 4.2 | 6.4 | 8.6 | 9.9 | 30.2 | 13.9 | 15.1 | -- | -- |
| 361 | Davis, USA | 6.9 | 6 | 9.8 | 2.9 | 2.4 | 4.1 | 4.6 | 8.1 | 11.5 | 9.8 | 6.1 | 8.9 | 9.2 | 8.2 | 10.6 | 15.1 | 7.7 | 11.2 | 9.1 |
| 362 | Loomis, USA | 6.9 | 8.3 | 10.9 | 6.6 | 3.4 | 3.6 | 4 | 7.1 | 8.6 | 9.3 | 6.3 | 7.2 | 8 | 8.5 | 13.7 | 18.3 | 7.6 | -- | -- |
| 363 | Pacheco, USA | 6.9 | 7.3 | 12.5 | 3.2 | 2.3 | 3.9 | 3.8 | 8.1 | 12.4 | 10.2 | 4.4 | 9.4 | 13.3 | 8.9 | 11.7 | -- | -- | -- | -- |
| 364 | Priest, USA | 6.9 | 4 | 5 | 3.2 | 3.7 | 5.9 | 7.8 | 9.3 | 8.4 | 11.3 | 9.9 | 7.3 | 4.6 | 8 | -- | -- | -- | -- | -- |
| 365 | Ramona, USA | 6.9 | 2.9 | 3.4 | 4.3 | 8.2 | 8 | 7.9 | 10.4 | 8.5 | 11.9 | 5.5 | 5.1 | 5.9 | 6.5 | 9 | -- | -- | -- | -- |
| 366 | San Lorenzo, USA | 6.9 | 4.7 | 7.9 | 4.1 | 3.9 | 5.4 | 4.2 | 7.6 | 10.2 | 11.9 | 6.3 | 7.9 | 9.6 | 9.2 | 9.4 | 12 | 8.2 | -- | -- |
| 367 | Tulelake, USA | 6.9 | 4.6 | 6.2 | 4.3 | 3 | 4.7 | 5.1 | 9 | 20.9 | 8.6 | 5 | 6.6 | 3.1 | 6.8 | 19.8 | 13.3 | 8.1 | -- | -- |
| 368 | Alameda, USA | 6.8 | 4.3 | 8.5 | 3 | 3.7 | 4.3 | 4.4 | 6.9 | 10 | 11.9 | 6.8 | 8 | 9.8 | 9.6 | 9.2 | 12.6 | 8.3 | 10.3 | 9.5 |
| 369 | Apple Valley, USA | 6.8 | 6.2 | 5.3 | 5.6 | 5.5 | 7.4 | 8.6 | 6.9 | 5.1 | 9.4 | 5.6 | 7.5 | 8.7 | 5.9 | 7.6 | 9.9 | 7 | -- | -- |
| 370 | Catheys Valley, USA | 6.8 | 7.1 | 7.4 | 3.2 | 3.4 | 4.4 | 6.3 | 7.1 | 8.4 | 10.2 | 8.3 | 8.2 | 7 | 8.1 | 12.2 | 18.8 | 7.5 | -- | -- |
| 371 | Courtland, USA | 6.8 | 7.3 | 13.7 | 3.5 | 2.7 | 4.3 | 4.6 | 10.7 | 19.5 | 10.6 | 6.1 | 8.2 | 2 | 9 | -- | -- | -- | -- | -- |
| 372 | Crestline, USA | 6.8 | 4 | 5.8 | 6 | 7.5 | 7.6 | 8.4 | 8.9 | 6.8 | 7.6 | 5.7 | 6.4 | 7 | 7.3 | 9 | 9.4 | 8.2 | 9.3 | 11.4 |
| 373 | East Palo Alto, USA | 6.8 | 3.9 | 6.9 | 3.1 | 3.4 | 4.2 | 4.1 | 8.1 | 10.8 | 12.3 | 6.7 | 7.7 | 9.5 | 9.3 | 9 | -- | -- | -- | -- |
| 374 | Esparto, USA | 6.8 | 3.7 | 9.1 | 3.7 | 2.9 | 4.8 | 5.6 | 9.8 | 13.1 | 9.8 | 5.4 | 7 | 6.2 | 6.6 | 11.3 | -- | 6.6 | -- | -- |
| 375 | Heber, USA | 6.8 | 10.2 | 7.5 | 6 | 7.5 | 5.9 | 6.1 | 6.9 | 4.1 | 5.9 | 6.5 | 6.4 | 8.9 | 7.3 | 8.8 | -- | -- | -- | -- |
| 376 | Helendale, USA | 6.8 | 4.1 | 9.3 | 4.5 | 5.4 | 7.6 | 8.5 | 7.5 | 5.8 | 8.4 | 5.7 | 6.5 | 6.4 | 5.2 | 6.6 | 8.9 | 6.2 | -- | -- |
| 377 | Lakehead-Lakeshore, USA | 6.8 | 2.9 | 6.7 | 4.9 | 3.4 | 4.9 | 6.3 | 8.7 | 16.5 | 8.7 | 7.1 | 5.4 | 6.1 | 6.8 | 22.7 | 14.2 | 7.6 | -- | -- |
| 378 | Millville, USA | 6.8 | 3.8 | 10.3 | 4.6 | 3.9 | 4.7 | 6.5 | 7.9 | 21.3 | 8.4 | 10.4 | 6.3 | 6.6 | 6.7 | 16.4 | 16.6 | 6.4 | -- | -- |
| 379 | Newark, USA | 6.8 | 4.3 | 7.4 | 3.1 | 3.7 | 4.3 | 4.3 | 8.1 | 10.5 | 11.9 | 6.6 | 7.4 | 9.8 | 9.5 | 9.4 | 10.8 | 6.4 | -- | -- |
| 380 | Redding, USA | 6.8 | 4 | 7.8 | 3.8 | 2.9 | 4.6 | 5.6 | 8.5 | 15.5 | 8.4 | 7.3 | 6.2 | 7.7 | 6.6 | 16.7 | 14.1 | 6.4 | -- | -- |
| 381 | Rocklin, USA | 6.8 | 6.8 | 9.4 | 3.2 | 3.6 | 4.3 | 4.6 | 7.6 | 9.6 | 9 | 6 | 7.8 | 9.1 | 8.7 | 13.1 | 16.5 | 6.6 | -- | -- |
| 382 | Tassajara, USA | 6.8 | 4.7 | 5 | 4.4 | 4.6 | 5.4 | 5.8 | 8.2 | 10.9 | 11.8 | 5.3 | 6.3 | 8.2 | 6.7 | -- | -- | -- | -- | -- |
| 383 | Applegate, USA | 6.7 | 6.3 | 9.7 | 4.8 | 4.9 | 5.3 | 6.3 | 6.4 | 7.9 | 8.4 | 6.4 | 7.8 | 6.4 | 10.5 | 13.5 | 19.4 | 6.8 | -- | -- |
| 384 | Brawley, USA | 6.7 | 5.3 | 5.3 | 4.2 | 8.8 | 8.8 | 7.6 | 6.7 | 5.6 | 7.6 | 6.5 | 6.3 | 7.9 | 8.1 | 6.6 | -- | -- | -- | -- |
| 385 | Campo, USA | 6.7 | 1.7 | 2.3 | 4.7 | 8.1 | 9.9 | 11.6 | 9.3 | 7.2 | 10.1 | 5.2 | 4.8 | 5.1 | 5.5 | -- | -- | -- | -- | -- |
| 386 | Copperopolis, USA | 6.7 | 6.2 | 7.4 | 3.2 | 3.2 | 3.9 | 5.2 | 7 | 8.7 | 9.2 | 11.4 | 7.5 | 7.7 | 7.3 | 12.3 | -- | -- | -- | -- |
| 387 | Dublin, USA | 6.7 | 2.9 | 7.2 | 4.1 | 3.8 | 4.5 | 4.8 | 8.5 | 11.4 | 11.4 | 5.7 | 7.1 | 9.4 | 8.3 | 8.7 | 12.5 | 7.1 | -- | -- |
| 388 | Graeagle, USA | 6.7 | 5 | 5.6 | 4.2 | 4.4 | 5.5 | 8.2 | 7.4 | 8.4 | 8.6 | 6.5 | 7.8 | 8.8 | 7.6 | 16 | -- | -- | -- | -- |
| 389 | Grant, USA | 6.7 | 2.1 | 6.2 | 3.3 | 2.6 | 4.1 | 5.8 | 9.2 | 18.3 | 8.9 | 6.8 | 4.7 | 5.2 | 6.4 | -- | -- | -- | -- | -- |
| 390 | Happy Valley, USA | 6.7 | 3.3 | 7.9 | 3.7 | 3 | 3.9 | 5.6 | 8.4 | 15.8 | 7.9 | 7.7 | 5.8 | 7 | 6.4 | -- | -- | -- | -- | -- |
| 391 | Hesperia, USA | 6.7 | 3.3 | 3.8 | 6.4 | 6.4 | 8.9 | 9.9 | 7 | 5.2 | 9.9 | 5.5 | 6.2 | 7.3 | 6 | 8.5 | 10.8 | 8 | -- | -- |
| 392 | Holtville, USA | 6.7 | 6.3 | 5.6 | 4.8 | 7.3 | 5.9 | 8.3 | 8.7 | 4.4 | 6 | 6.2 | 6.7 | 9.5 | 7.1 | 7.7 | -- | -- | -- | -- |
| 393 | Imperial, USA | 6.7 | 6.5 | 5.3 | 4.5 | 7.6 | 6.5 | 6.2 | 7.7 | 5.4 | 7.8 | 7.3 | 7.5 | 7.6 | 7.5 | 6.8 | -- | -- | -- | -- |
| 394 | Jackson, USA | 6.7 | 6.8 | 8.2 | 5 | 3.8 | 4 | 4.7 | 6.4 | 7.9 | 8.9 | 8.1 | 8 | 7.9 | 7.1 | 11.4 | 15 | 6.2 | -- | -- |
| 395 | Pittsburg, USA | 6.7 | 4.4 | 8.7 | 3 | 2.4 | 3.7 | 4.4 | 8.3 | 11.2 | 10.5 | 4.9 | 8 | 10.3 | 7.4 | 9.9 | -- | -- | -- | -- |
| 396 | Quincy, USA | 6.7 | 7.8 | 8.9 | 5.8 | 3.6 | 4 | 6 | 5.6 | 7 | 6.3 | 7.4 | 9 | 9 | 8.8 | 21.1 | 25.4 | 8.2 | 11.4 | 13.3 |
| 397 | Shasta Lake, USA | 6.7 | 4.1 | 7.5 | 5.5 | 3.4 | 4.5 | 5.6 | 8.1 | 15.8 | 8.1 | 6.8 | 5.5 | 5.8 | 6.6 | 19.6 | 15.5 | 7.6 | -- | -- |
| 398 | West Point, USA | 6.7 | 4.9 | 8.6 | 4.7 | 4.8 | 6.4 | 6.7 | 5.7 | 6.4 | 9.5 | 8.6 | 7.3 | 7.5 | 7 | 14.2 | 17.9 | 6.4 | -- | -- |
| 399 | Calimesa, USA | 6.6 | -- | -- | 6.5 | 6.5 | 5 | 5.2 | 5.6 | 4 | 4.1 | 6.6 | 9.8 | 13 | -- | -- | -- | -- | -- | -- |
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