World's most polluted cities (historical data 2017-2021)
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
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2021
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2021 Report - English
2021 World air quality report
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Meets WHO guideline
Exceeds by 1 to 2 times
Exceeds by 2 to 3 times
Exceeds by 3 to 5 times
Exceeds by 5 to 7 times
Exceeds by 7 to 10 times
Exceeds by over 10 times
Rank  | City | 2021 | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Saint-Denis, France | 17.4 | 22.7 | 19.4 | 20.3 | 18.1 | 12.6 | 14.6 | 15.6 | 13.3 | 16.1 | 17.1 | 21.1 | 17.7 | 15.9 | 16.3 | 17.6 | 19.5 |
| 2 | Biot, France | 14.5 | 19.8 | 19.3 | 20.2 | 13 | 7.9 | 14.3 | 12.1 | 11 | 14.8 | 13.5 | 13.3 | 15 | - | - | - | - |
| 3 | Roubaix, France | 13.9 | 13 | 17.1 | 20.1 | 17.7 | 10.4 | 13.1 | 11.4 | 8.8 | 15.6 | 11.8 | 15.2 | 14.4 | - | 14.2 | 14.9 | 14.9 |
| 4 | Paris, France | 13.7 | 17.4 | 17.5 | 19.1 | 17.8 | 8.3 | 11 | 11 | 7.9 | 13.2 | 12.2 | 16.3 | 13.4 | 12.2 | 14.7 | 15.6 | 15.4 |
| 5 | Saint-Andre, France | 13.7 | - | 24.9 | 18.2 | 12.8 | 7.2 | 13.8 | 11.9 | 10.9 | 14.6 | 13.1 | 14.7 | 17.7 | - | - | - | - |
| 6 | Mantes-La-Jolie, France | 13.4 | 21.4 | 16.9 | 19.4 | 18.8 | 7.7 | 10.9 | 10.2 | 7.4 | 13.9 | 13.3 | 3.3 | 1.8 | - | - | - | - |
| 7 | Saint-Quentin, France | 12.6 | 14.2 | 14.2 | 16.3 | 17.5 | 8.2 | 12.7 | 12.3 | 8.2 | 11.2 | 10.5 | 13.3 | 12.3 | 11.1 | 12.2 | 14.3 | 13.4 |
| 8 | La Mulatiere, France | 12.5 | 16.6 | 16.9 | 14.8 | 10.2 | 7.2 | 9.6 | 10.2 | 8.5 | 9.8 | 12.3 | 14.7 | 18.3 | 14.6 | 12.8 | 14.1 | 15.1 |
| 9 | Marignane, France | 12.4 | 16 | 15.1 | 16.3 | 10.9 | 7.6 | 9.1 | 8.2 | 9.1 | 10.3 | 11 | 12.7 | 21.6 | 12 | - | - | - |
| 10 | Marseille 16, France | 12.3 | - | - | 15.8 | 13.9 | 7.1 | 12.2 | 10.1 | 9.8 | 12.5 | 12.3 | 12.9 | 16.6 | - | - | - | - |
| 11 | Gardanne, France | 12.2 | 15.7 | 14.8 | 15.1 | 10.1 | 7.5 | 10.1 | 9.2 | 10.4 | 8.8 | 10.9 | 14.2 | 19.8 | 11.3 | 11.2 | 12.1 | 12.2 |
| 12 | Romans-sur-Isere, France | 12.1 | 16.1 | 17.5 | 15.4 | 10.6 | 4.4 | 8.6 | 7.7 | 7.4 | 8.9 | 10.9 | 16.4 | 21.4 | 11.5 | 9.8 | - | - |
| 13 | Valenciennes, France | 12 | - | - | 14.1 | 16.6 | 8.1 | 12.8 | 9.9 | 7.7 | 14.2 | 10.3 | 14.7 | 12.9 | 10 | 11.3 | 15.3 | 15.1 |
| 14 | Crolles, France | 11.9 | 20.5 | 21.8 | 13.3 | 8.8 | 4 | 8.1 | 7.2 | 6 | 7.1 | 8.7 | 17.9 | 18.3 | 9.9 | - | - | - |
| 15 | Lille, France | 11.9 | 13 | 12.6 | 15.6 | 16.4 | 7.8 | 11.8 | 9.6 | 7.5 | 14.1 | 10 | 13.3 | 12.2 | 10.1 | 11.8 | 14.3 | 14.2 |
| 16 | Rouen, France | 11.8 | 17.1 | 13.9 | 14.8 | 13.4 | 7.4 | 9.3 | 8.9 | 7.5 | 10.6 | 10.9 | 15.2 | 13 | 9.6 | 12.5 | 12.6 | 10.7 |
| 17 | Lyon, France | 11.7 | 15.6 | 16.6 | 15.2 | 10.3 | 5.6 | 8.8 | 8.5 | 7.7 | 9.7 | 11.3 | 15 | 15 | 11.7 | 11.4 | 11.7 | 15 |
| 18 | Amiens, France | 11.7 | 13.8 | 14.9 | 16.8 | 15.3 | 7.8 | 10.3 | 9.5 | 6.7 | 12.3 | 9.6 | 12.1 | 11.5 | - | 11.1 | - | - |
| 19 | Mulhouse, France | 11.6 | 12.2 | 16.2 | 13.3 | 10.6 | 5.8 | 11.2 | 8.4 | 8.7 | 11.3 | 13.9 | 16.3 | 11.9 | 12 | 11.7 | 13 | 14.2 |
| 20 | Bethune, France | 11.6 | 12.4 | 13 | 16.3 | 15 | 7.8 | 11.3 | 8.7 | 6.3 | 13.7 | 9.7 | 13.8 | 11.7 | 10.3 | 11.4 | 13.9 | 13.4 |
| 21 | Beauvais, France | 11.4 | 14.1 | 14.2 | 18 | 16.9 | 10.6 | 10.1 | 10.7 | 5.8 | 8.6 | 7.3 | 8.3 | 8 | 9.9 | - | - | - |
| 22 | Creil, France | 11.3 | 14.5 | 14.3 | 15.7 | 15 | 6.3 | 7.7 | 8.4 | 7.9 | 11.7 | 10.8 | 12.6 | 11.6 | 9.9 | 10.1 | 12.5 | 12 |
| 23 | Bobigny, France | 11.3 | 15.9 | 14.5 | 16 | 14.5 | 7.3 | 7.8 | 8.7 | 6.7 | 11 | 11 | 12.1 | 10.8 | 10.6 | 10 | 11.2 | 11.2 |
| 24 | Frejus, France | 11.3 | 13.9 | 15.1 | 14.5 | 9.5 | 6.7 | 9.5 | 8.4 | 9.2 | 9 | 10.1 | 11.7 | 18 | 11.2 | - | - | - |
| 25 | Dieppe, France | 11.2 | 11.3 | 12 | 13.7 | 13.8 | 8.8 | 10 | 10 | 8.5 | 12.8 | 9.4 | 11.9 | 12.5 | 9.6 | 11.2 | 12.4 | - |
| 26 | Saint-Martin-d'Heres, France | 11.1 | 15.2 | 17.9 | 12.8 | 8.3 | 3.3 | 8.1 | 7.1 | 6.9 | 8.2 | 8.3 | 15.5 | 18.5 | 9.7 | - | - | - |
| 27 | Tours, France | 11.1 | 16.4 | 13.4 | 15.4 | 13 | 7.5 | 8.2 | 8.5 | 6.9 | 8.5 | 10.4 | 13.3 | 11.5 | 10.2 | 11.1 | - | - |
| 28 | Gennevilliers, France | 11.1 | 14.5 | 13.7 | 15.8 | 15.3 | 6.2 | 7.9 | 8.2 | 6.7 | 10.1 | 9.8 | 15.8 | 10.5 | 9 | 11.9 | 13 | 12.7 |
| 29 | Gonesse, France | 11.1 | 14.9 | 13.9 | 16.1 | 13.9 | 7.1 | 7 | 7.3 | 6.6 | 9 | 10.6 | 14.5 | 12.4 | 9.5 | 11.1 | 12.4 | 12 |
| 30 | Rognac, France | 11.1 | 14.2 | 15.3 | 15.2 | 11.1 | 7.8 | 9.8 | 8.6 | 9.4 | 8.9 | 9.3 | 8.6 | 14.8 | 10.9 | - | - | - |
| 31 | Strasbourg, France | 10.9 | 12 | 17.8 | 12.9 | 10.5 | 5.3 | 10.3 | 7.5 | 6.9 | 10.2 | 12.5 | 13.5 | 11.7 | 10.6 | 14 | 14.4 | 15.9 |
| 32 | Trois-Rivieres, France | 10.9 | 6.7 | 10.1 | 7.4 | 10.2 | 9 | 14.8 | 15.1 | 16.8 | 9.4 | 19.2 | 4.5 | 7.7 | 9.2 | - | - | - |
| 33 | Melun, France | 10.9 | 16.8 | 14.3 | 16.2 | 12.8 | 6.7 | 7 | 6.8 | 6.6 | 8.5 | 10.3 | 14.4 | 11.1 | 10.8 | 13.6 | 14.1 | 12.9 |
| 34 | Le Havre, France | 10.9 | 11.7 | 12.5 | 14.3 | 13.7 | 8.3 | 9.5 | 8.8 | 7.4 | 11.7 | 9.5 | 11.9 | 11.4 | 8.4 | 9.7 | 10 | 10.1 |
| 35 | Passy, France | 10.8 | 19 | 15.3 | 12.6 | 9 | 5.3 | 5.8 | 6.6 | 6 | 6.7 | 7.6 | 15.7 | 20.3 | 10.9 | 10 | 11.1 | 17.1 |
| 36 | Reims, France | 10.8 | 12.3 | 13.3 | 16.6 | 15.1 | 7 | 10.4 | 8.9 | 7.6 | 8.3 | 8.3 | 11.9 | 10.3 | 10 | 11.2 | 13.1 | 13.3 |
| 37 | Campagne-les-Boulonnais, France | 10.8 | 8.8 | 12.8 | 15.1 | 13.7 | 8.4 | 10.7 | 9.2 | 6.5 | 13.6 | 9.7 | 10.2 | 12.2 | 9.1 | 9.9 | 12.8 | 11.3 |
| 38 | Ternay, France | 10.7 | 14.6 | 14.3 | 12.5 | 8 | 4.8 | 7.9 | 7.5 | 7.4 | 8.1 | 10.1 | 16 | 16.3 | 9 | - | - | - |
| 39 | Valence, France | 10.7 | 14.5 | 15.3 | 13.4 | 10 | 4.2 | 7.8 | 7.3 | 7.2 | 8.3 | 9.6 | 14.7 | 16.1 | 10 | 10.9 | 11.2 | - |
| 40 | Vitry-Sur-Seine, France | 10.7 | 15.1 | 14.7 | 15.6 | 13.3 | 5.2 | 7.2 | 7.8 | 7.1 | 9 | 9.1 | 13.2 | 11 | 10.1 | 10.9 | 13.4 | 11.8 |
| 41 | Chambery, France | 10.6 | 12.2 | 14.9 | 11.2 | 7.4 | 3.3 | 6.9 | 5.9 | 5.9 | 8.7 | 10.2 | 18.6 | 18.9 | 8.7 | 8.6 | 10.6 | 13.3 |
| 42 | Lunéville, France | 10.5 | 10.2 | 15.1 | 14.3 | 11 | 5.7 | 11 | 8.2 | 7.8 | 9.4 | 10.9 | 12.7 | 10.1 | 10.2 | 10.5 | 12.2 | 12.1 |
| 43 | Nancy, France | 10.5 | 10.1 | 12.2 | 12.9 | 11.6 | 6.5 | 12.7 | 8.6 | 7.8 | 9.5 | 10.4 | 12.9 | 11.2 | 9.5 | 9.4 | 10.9 | 10.8 |
| 44 | Saint-Martin-Boulogne, France | 10.5 | 10.7 | 12.3 | 14.3 | 11.9 | 8.2 | 11.2 | 10 | 6.4 | 12.5 | 8.6 | 10.5 | 10.4 | - | - | - | - |
| 45 | Avignon, France | 10.5 | 11.5 | 17.2 | 14.3 | 9.6 | 4.2 | 8 | 6.8 | 7.3 | 8.4 | 9.8 | 12.2 | 17 | 10.3 | 11 | 11.8 | 12.7 |
| 46 | Vaulx-en-Velin, France | 10.4 | 14.7 | 14.5 | 13.8 | 8.8 | 3.7 | 7.6 | 7.5 | 6.7 | 7.7 | 9.8 | 13.4 | 14.8 | 10.7 | 10.6 | 10.8 | 11.4 |
| 47 | Saint-Jean-de-Braye, France | 10.4 | 15.7 | 12.4 | 15.1 | 12 | 4.5 | 5.6 | 7 | 5.9 | 7.4 | 10.3 | 16.3 | 12 | 8.9 | 9.9 | 10.7 | 11.9 |
| 48 | Douai, France | 10.4 | 12.7 | 14.8 | 13.2 | 17.1 | 6.4 | 10.2 | 8.1 | 6.8 | 11.2 | 7.9 | 10.4 | 10 | 12 | 12.3 | 15 | 13.5 |
| 49 | Kuntzig, France | 10.3 | 14 | 13.1 | 14 | 10.8 | 5 | 8 | 7.2 | 6.8 | 7.8 | 9.8 | 14.4 | 11.3 | 8.4 | - | - | - |
| 50 | Sainte-Luce, France | 10.3 | 7.4 | 10.8 | 7.6 | 14 | 12.1 | 13.3 | 12.4 | 11.2 | 9.4 | 18 | 4.1 | 6.6 | 9.4 | 8.9 | - | - |
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