World's most polluted cities 2020 (PM2.5)
The most polluted cities according to data aggregated from over 80,000 data points.
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2020
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2020 Report - English
2020 World air quality report
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PM2.5 Legend 
WHO target
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
Unit: µg/m³
| Rank | City | 2020 AVG | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2019 AVG | 2018 AVG | 2017 AVG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 351 |  Santa Barbara, USA | 10 | 7 | 9.1 | 4.3 | 6.3 | 7.5 | 7.1 | 9.3 | 14.1 | 20.7 | 18.7 | 8.9 | 6.6 | 8.4 | 8.7 | - |
| 352 | Thousand Oaks, USA | 10 | 7.5 | 8.4 | 3.7 | 5.9 | 7.1 | 8.7 | 9.8 | 14.2 | 19.2 | 19.7 | 8.8 | 6 | 8.2 | 9.4 | 9.2 |
| 353 | Apple Valley, USA | 9.9 | 10.5 | 7.7 | 4.6 | 6.1 | 5.2 | 7.3 | 6.2 | 13.8 | 19.9 | 15.2 | 9.2 | 10.6 | 7 | - | - |
| 354 | Banning, USA | 9.9 | 7.6 | 8 | 5.2 | 7 | 9.8 | 10.9 | 10.7 | 13.3 | 16.4 | 14.1 | 7.7 | 7.7 | 9.6 | 11 | 12 |
| 355 | Berkeley, USA | 9.9 | 6.4 | 8.1 | 4.4 | 4 | 4 | 5.7 | 6.6 | 15.8 | 29.1 | 14.6 | 9.6 | 11 | 7.1 | - | - |
| 356 | Corte Madera, USA | 9.9 | 6.3 | 7.1 | 4.7 | 3.8 | 3.4 | 3.9 | 5.8 | 15.5 | 30.2 | 15.1 | 7.9 | 11.5 | 6.1 | - | - |
| 357 | Fillmore, USA | 9.9 | 5.7 | 6.2 | 3.6 | 5.7 | 6.5 | 8.2 | 10.1 | 15 | 20.9 | 19.9 | 7.4 | 5.7 | 7.6 | 9.9 | 8.4 |
| 358 | Hollister, USA | 9.9 | 7.2 | 7.7 | 4.7 | 4.5 | 4.4 | 5.1 | 7.1 | 21.4 | 23.3 | 16.1 | 7.4 | 9.4 | 5.6 | 7.3 | 5.6 |
| 359 | Oak View, USA | 9.9 | 5.6 | 7.4 | 4.5 | 5.7 | 6.3 | 7.9 | 8.3 | 13.3 | 18.9 | 19.3 | 8.6 | 8.1 | 7.9 | - | - |
| 360 | San Carlos, USA | 9.9 | 5.8 | 7.4 | 4.3 | 3 | 2.8 | 3.2 | 5.3 | 18.1 | 28.8 | 15 | 9.4 | 10.5 | 6.2 | - | - |
| 361 | San Mateo, USA | 9.9 | 5.5 | 6.8 | 4.3 | 3.5 | 3.2 | 3.2 | 4.9 | 23.5 | 27.1 | 14.6 | 9 | 11.1 | 6 | - | - |
| 362 | Saratoga, USA | 9.9 | 5.7 | 7.1 | 4.4 | 3.6 | 3.1 | 4 | 6.4 | 22.4 | 27.5 | 15.6 | 7.2 | 7.9 | 5.9 | - | - |
| 363 | Sausalito, USA | 9.9 | 6.3 | 7.3 | 5 | 4.3 | 4.5 | 4.7 | 6.2 | 12.8 | 29.5 | 14.3 | 7.8 | 12.5 | 6.5 | - | - |
| 364 | Victorville, USA | 9.9 | 11.1 | 8.1 | 4.5 | 5.9 | 6.2 | 7.7 | 7 | 13.4 | 19.3 | 14.3 | 9.8 | 10.6 | 7.3 | - | - |
| 365 | Lancaster, USA | 9.8 | 7 | 6.4 | 4 | 5.1 | 4.5 | 6 | 6.1 | 19.6 | 25.3 | 17.1 | 7.6 | 8.3 | 5.7 | 7.3 | 8.6 |
| 366 | Tiburon, USA | 9.8 | 6.4 | 7.5 | 4.6 | 3.8 | 3.5 | 4 | 5.8 | 14.8 | 28.7 | 14.2 | 8.2 | 12.6 | 6.4 | - | - |
| 367 | Trinidad, USA | 9.8 | 8.4 | 7.9 | 6.2 | 6.3 | 4.9 | 6.2 | 6.6 | 8.9 | 27 | 13.8 | 8.4 | 10.8 | 6.7 | - | - |
| 368 | Westmorland, USA | 9.8 | 16.6 | 11.2 | 4.7 | 5.8 | 9.4 | 11.1 | 9.3 | 9.3 | 12.4 | 12.1 | 7.8 | 8.2 | - | - | - |
| 369 | Wrightwood, USA | 9.8 | 11.4 | 7.5 | 6.1 | 4.2 | 3.4 | 4.4 | 4.1 | 11.6 | 18.8 | 10.6 | 11.9 | 18.4 | - | - | - |
| 370 | Burlingame, USA | 9.7 | 6.1 | 7.2 | 4.6 | 3.2 | 3 | 3.2 | 4.6 | 16.8 | 28.9 | 14 | 9.5 | 11.1 | 6.2 | - | - |
| 371 | Kensington, USA | 9.7 | 5.9 | 7.8 | 4.8 | 3.7 | 3.6 | 4.4 | 6.5 | 15.1 | 27.6 | 15 | 9.3 | 10.1 | 6.7 | - | - |
| 372 | Woodacre, USA | 9.7 | 4.8 | 5.5 | 3.8 | 3 | 2 | 2.3 | 3.7 | 22.2 | 29.8 | 15.3 | 7.4 | 10 | 4.7 | - | - |
| 373 | San Francisco, USA | 9.6 | 7.1 | 8.1 | 4.7 | 4.1 | 4.2 | 4.8 | 6.1 | 12.7 | 26.5 | 14.4 | 9 | 13.9 | 7.1 | 12.6 | 10 |
| 374 | Barstow, USA | 9.5 | 8.5 | 7.4 | 4.2 | 5.7 | 5.3 | 10.3 | 6.7 | 16.4 | 23.1 | 15.2 | 5.6 | 4.3 | 6.7 | - | - |
| 375 | Belmont, USA | 9.5 | 5.7 | 6.8 | 3.9 | 3 | 2.9 | 3.7 | 5.1 | 18.2 | 28.3 | 14.4 | 8.8 | 11.4 | 5.9 | - | - |
| 376 | Emerald Hills, USA | 9.5 | 4.8 | 6.6 | 4.8 | 3.1 | 2.7 | 3.2 | 4.9 | 18.1 | 26.3 | 13.3 | 9.2 | 9.8 | 5.9 | - | - |
| 377 | San Bruno, USA | 9.5 | 5.5 | 6.9 | 4.3 | 3.5 | 3.4 | 3.7 | 5.3 | 15.9 | 28.6 | 13.1 | 8.6 | 11.3 | 5.8 | - | - |
| 378 | Winchester, USA | 9.5 | 7.5 | 7.3 | 4.9 | 7.4 | 9.7 | 9.9 | 10.2 | 12.7 | 16.2 | 14.2 | 8 | 6.3 | 7.8 | 7.4 | 10.2 |
| 379 | Calipatria, USA | 9.4 | 6.6 | 7.6 | 5.8 | 6.7 | 9.1 | 10.7 | 10 | 11.1 | 11.7 | 12.3 | 8.8 | 10 | 6.5 | - | - |
| 380 | Cayucos, USA | 9.4 | 6.7 | 7.4 | 4.4 | 4.4 | 5.2 | 4.5 | 6.2 | 14.3 | 21.1 | 14.3 | 10.5 | 8.7 | 5.9 | - | - |
| 381 | Crestline, USA | 9.4 | 8.5 | 6.7 | 4.9 | 6.7 | 9.8 | 9.7 | 9.3 | 13.4 | 16.3 | 11.4 | 8.6 | 6.4 | 8.2 | 9.3 | 11.4 |
| 382 | Cupertino, USA | 9.4 | 3.9 | 6.5 | 3.7 | 3 | 3 | 3.9 | 6.1 | 20.9 | 27 | 15.7 | 7.5 | 7.6 | 5.6 | - | - |
| 383 | Keeler, USA | 9.4 | 4.8 | 5.6 | 4.2 | 4.5 | 5.2 | 6.8 | 6.3 | 15.4 | 29.8 | 19.5 | 5.3 | 4.7 | 4.7 | 7.1 | 8.1 |
| 384 | Lake Arrowhead, USA | 9.4 | 7 | 6.9 | 6.3 | 8.1 | 7.8 | 7.7 | 6.6 | 14 | 18.3 | 13.3 | 6.1 | 5.6 | 7.6 | - | - |
| 385 | Palmdale, USA | 9.4 | 5.1 | 5.7 | 3.6 | 5.2 | 4.2 | 6.2 | 5.6 | 18.8 | 27 | 17 | 5 | 4.9 | 5.5 | - | - |
| 386 | Portola Valley, USA | 9.4 | 3.6 | 5.9 | 3.8 | 2.9 | 2.7 | 3.8 | 5.4 | 24.8 | 27.3 | 13 | 6.4 | 6.6 | 5.2 | - | - |
| 387 | Oxnard, USA | 9.3 | 5.1 | 6.2 | 3.5 | 5.6 | 7.3 | 6.7 | 8.4 | 12.6 | 19.5 | 17.8 | 10.8 | 7.2 | 7.2 | 8.7 | 9.5 |
| 388 | Santa Maria, USA | 9.3 | 5 | 6.5 | 4.4 | 5.2 | 6.1 | 6.7 | 8.5 | 15.5 | 21.9 | 15.8 | 8.4 | 7.1 | 6.5 | 7.1 | 7.5 |
| 389 | Goleta, USA | 9.2 | 4.4 | 7.2 | 4.3 | 5.4 | 6.3 | 6.8 | 8.8 | 14 | 19.5 | 18 | 9 | 6.4 | 6.9 | 7.9 | 9.5 |
| 390 | San Luis Obispo, USA | 9.2 | 5.6 | 7.2 | 3.9 | 3.8 | 4.4 | 5.2 | 6.4 | 20.2 | 20.6 | 16.8 | 8.6 | 7.1 | 5.4 | 7.6 | 8.4 |
| 391 | Nipomo, USA | 9.1 | 5.4 | 7.5 | 4.5 | 4.7 | 5.8 | 7.2 | 7.3 | 14.4 | 19.8 | 16.4 | 8.5 | 7.2 | 6.2 | 8.4 | 9.7 |
| 392 | San Rafael, USA | 9.1 | 6.4 | 7.3 | 4.9 | 3.4 | 2.7 | 3.6 | 4.3 | 18.6 | 26.3 | 14 | 6.6 | 11.1 | 5.7 | 11.2 | 10 |
| 393 | McKinleyville, USA | 9 | 7.6 | 7.6 | 6.2 | 5.4 | 3.8 | 4.3 | 4.9 | 7.4 | 23.6 | 13.1 | 9.7 | 11.9 | 6.5 | - | - |
| 394 | Phelan, USA | 9 | 7.6 | 6.3 | 5 | 6.5 | 5.4 | 7.3 | 6.6 | 13.8 | 21.2 | 14.8 | 6 | 5.8 | 6.2 | - | - |
| 395 | Point Reyes Station, USA | 9 | 4.5 | 5.5 | 4.7 | 4.1 | 3.8 | 3.9 | 5.4 | 14 | 31.8 | 13 | 6.1 | 8.1 | 5.3 | - | - |
| 396 | Gualala, USA | 8.9 | 6.4 | 7.4 | 7.3 | 7.1 | 4.7 | - | 3.9 | 6.5 | 22.4 | 13.2 | 6.5 | 8 | 6 | - | - |
| 397 | Helendale, USA | 8.9 | 6.9 | 6.5 | 4.1 | 5 | 5 | 6.5 | 6 | 15 | 22.4 | 13.3 | 6.1 | 6.2 | 6.2 | - | - |
| 398 | Muir Beach, USA | 8.9 | 6 | 6.4 | 5.4 | 4.9 | 5.4 | 6.2 | 6.4 | 10 | 31.6 | 12.4 | 3.9 | 6.4 | 6.3 | - | - |
| 399 | Pinon Hills, USA | 8.8 | 4.8 | 5 | 3.7 | 3.9 | 3.4 | 4.7 | 5 | 13.9 | 27.3 | 12.2 | 3.9 | 3.4 | 4.4 | - | - |
| 400 | Huron, USA | 8.7 | 4 | 4.9 | 3.5 | 4 | 6.5 | 7.1 | 7 | 21.5 | 20.1 | 12.3 | 4.9 | 5.2 | 5.8 | 10.3 | 10.3 |
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