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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Liestal, Switzerland | 14.9 | 17.8 | 24.4 | 15.2 | 12.2 | 13.5 | 15.1 | 8.4 | 11.8 | 11.1 | 12.7 | 37.5 | 23.8 | 12.8 | 12.8 | 13.7 | 14.7 | -- | -- |
| 2 | Chiasso, Switzerland | 14.6 | 23.2 | 31.3 | 19.6 | 9.5 | 7.5 | 9.4 | 9.4 | 9 | 9.8 | 12.5 | 13.9 | 22.4 | 17.2 | 16.2 | -- | -- | -- | -- |
| 3 | Euthal, Switzerland | 14.3 | 17.5 | 26.6 | 21.8 | 12.4 | 10 | 12.7 | 11.6 | 15.4 | -- | 1.8 | 2.1 | 2.4 | -- | -- | -- | -- | -- | -- |
| 4 | Mendrisio, Switzerland | 13.9 | 20.6 | 29.2 | 18.8 | 9.6 | 7.9 | 9.7 | 9.6 | 9.2 | 10.1 | 12.9 | 11.8 | 18.9 | 16.6 | 15.5 | -- | -- | -- | -- |
| 5 | Bioggio, Switzerland | 11.7 | 16.3 | 24.1 | 17.2 | 8.3 | 6.7 | 9.3 | 9.2 | 9.3 | 9.2 | 11 | 7.5 | 13 | 13.2 | 11.7 | -- | -- | -- | -- |
| 6 | Rotkreuz, Switzerland | 11.5 | 15.3 | 20.6 | 15.6 | 9.4 | 11.6 | 14.4 | 7.6 | 10.2 | 8 | 8.2 | 4.4 | 10.8 | 14.5 | 16.1 | 15.4 | 16.3 | -- | -- |
| 7 | La Sarraz, Switzerland | 10.9 | 14.1 | 23.8 | 12.6 | 7.7 | 9.5 | 12 | 8.3 | 7.4 | 9.5 | 10.8 | 6.3 | 10.4 | -- | -- | -- | -- | -- | -- |
| 8 | Locarno, Switzerland | 10.4 | 14 | 21.9 | 13.6 | 6.6 | 6.1 | 9 | 8.8 | 8.9 | 8 | 10.3 | 6 | 10.9 | 11.4 | 10 | -- | -- | -- | -- |
| 9 | Pregassona, Switzerland | 10.3 | 14.5 | 20.4 | 14.7 | 7.2 | 6.2 | 8.7 | 8.5 | 8.5 | 8.7 | 10.5 | 5.8 | 10.2 | 11.6 | 10.9 | -- | -- | -- | -- |
| 10 | Écublens, Switzerland | 10.3 | 11.2 | 25.1 | 14.3 | 7.1 | 8.7 | 10 | 7 | 6.7 | 8.4 | 10.7 | 4.8 | 9.8 | 11.6 | 13.4 | 11 | 11.3 | 14.8 | -- |
| 11 | Truttikon, Switzerland | 10.1 | 10 | 17.2 | 11.7 | 8.8 | 9.9 | 12.3 | 8.3 | 8.3 | 11 | 9.4 | 6.4 | 9.1 | 16.8 | -- | -- | -- | -- | -- |
| 12 | Veyrier, Switzerland | 10 | 11.6 | 20.6 | 12.6 | 6.9 | 8.5 | 12.1 | 8.3 | 7.1 | 9.7 | 8.4 | 6.1 | 8.5 | 8 | -- | -- | -- | -- | -- |
| 13 | Cadenazzo, Switzerland | 9.9 | 12.7 | 21.7 | 13.4 | 6.8 | 6.3 | 9.2 | 8.4 | 8.2 | 7.6 | 9.5 | 5.8 | 10.9 | -- | -- | -- | -- | -- | -- |
| 14 | Lugano, Switzerland | 9.9 | 12.6 | 19.5 | 13.2 | 7.4 | 6.7 | 8.9 | 8.7 | 8.4 | 8.8 | 12.5 | 5.1 | 8.6 | 10 | 11.4 | 11.9 | 11.3 | 12.7 | 13.5 |
| 15 | Wädenswil, Switzerland | 9.9 | 9.3 | 12.5 | 11.3 | 8 | 10.7 | 14.2 | 10.8 | 8.2 | 8.3 | 9.1 | 4.9 | 5.3 | 8.1 | -- | -- | -- | -- | -- |
| 16 | Dietikon, Switzerland | 9.7 | 12 | 20 | 12.9 | 8.6 | 9.9 | 13.2 | 6.3 | 7.5 | 9.1 | 6.7 | 3 | 8.1 | 11.6 | 14.9 | -- | -- | -- | -- |
| 17 | Fehraltorf, Switzerland | 9.6 | 10.6 | 14.8 | 11.8 | 7.8 | 9.3 | 12.2 | 8.3 | 7.8 | 10.4 | 8.8 | 5.7 | 7.7 | 11 | -- | -- | -- | -- | -- |
| 18 | Lausanne, Switzerland | 9.4 | 10.6 | 21.1 | 12.7 | 8.1 | 9.1 | 11.3 | 7.1 | 7.4 | 8.6 | 7.4 | 3.4 | 6.9 | 10.8 | 12.1 | 9.8 | -- | -- | -- |
| 19 | Pully, Switzerland | 9.4 | 9.6 | 17.4 | 12.6 | 7.2 | 8.7 | 11 | 8.1 | 7 | 8.6 | 8.9 | 6 | 7.5 | 14.2 | -- | -- | -- | -- | -- |
| 20 | Steinmaur, Switzerland | 9.4 | 8.7 | 15.8 | 12.1 | 7.5 | 8.6 | 11.2 | 8.5 | 8.2 | 9.5 | 9.1 | 5.9 | 8.5 | 12 | -- | -- | -- | -- | -- |
| 21 | Bodio, Switzerland | 9.2 | 12.9 | 16.3 | 10.1 | 4.8 | 5.8 | 9.1 | 8.4 | 8.4 | 8.1 | 9.5 | 6.9 | 10.5 | 10.9 | 10.5 | -- | -- | -- | -- |
| 22 | Bern, Switzerland | 9.1 | 10.2 | 17.4 | 11.5 | 6.6 | 8.2 | 10.4 | 7.4 | 8.6 | 8.5 | 9 | 4.5 | 7.5 | 10.5 | 9.8 | 9.4 | 10.9 | 12.8 | 13.5 |
| 23 | Rorschach, Switzerland | 9.1 | 9.4 | 13.8 | 11.7 | 7.4 | 7.5 | 11.6 | 7.7 | 8.2 | 11.5 | 5.6 | 5.1 | 7.7 | 9.9 | 7.5 | 8.4 | 8.3 | -- | -- |
| 24 | Thal, Switzerland | 9.1 | 10.3 | 14 | 11.2 | 7.1 | 9.2 | 10.7 | 6.7 | 7.2 | 10 | 9.3 | 5.4 | 8.4 | 12.4 | 19.6 | -- | -- | -- | -- |
| 25 | Villmergen, Switzerland | 9 | -- | 10 | 11.2 | 7.6 | 9 | 11.6 | 8.1 | 8.4 | 10 | 9.4 | 5.9 | 8.6 | -- | -- | -- | -- | -- | -- |
| 26 | Brione sopra Minusio, Switzerland | 9 | 10.7 | 19.2 | 13.4 | 6.9 | 5.7 | 8.5 | 7.9 | 8.5 | 6.9 | 7.9 | 4.2 | 7.2 | -- | -- | -- | -- | -- | -- |
| 27 | Langenbruck, Switzerland | 8.9 | 8.5 | 13.2 | 11 | 7.7 | 8.9 | 11.5 | 7.9 | 8.1 | 7.9 | 8 | 6.8 | 8 | 8.5 | -- | -- | -- | -- | -- |
| 28 | Lucerne, Switzerland | 8.9 | 10.5 | 14.6 | 12.4 | 5.9 | 8.3 | 10.3 | 6.9 | 7.3 | 8.1 | 9.1 | 3.8 | 9.3 | 10.8 | 10.6 | 9.4 | 11 | 13.8 | -- |
| 29 | Veyras, Switzerland | 8.9 | 14.5 | 12.1 | 12.2 | 4.9 | 6.2 | 10.4 | 9.3 | 6.3 | 7.5 | 7.7 | 7.4 | 8 | 11.2 | -- | -- | -- | -- | -- |
| 30 | Härkingen, Switzerland | 8.8 | 8.9 | 16.7 | 10.8 | 6.5 | 8.1 | 11.2 | 6.8 | 8.8 | 7.8 | 7.9 | 4.1 | 7.9 | 9.3 | 9.1 | 8.8 | -- | -- | -- |
| 31 | Rapperswil, Switzerland | 8.8 | 9.6 | 12.6 | 10.7 | 7 | 8.3 | 10.1 | 7.2 | 7.5 | 8.6 | 9.5 | 5.7 | 8.4 | 12 | 6.6 | -- | -- | -- | -- |
| 32 | Giubiasco, Switzerland | 8.8 | 11.2 | 18.1 | 11.7 | 5.7 | 5.1 | 7.8 | 7.4 | 7.7 | 6.9 | 8.5 | 5.7 | 9.5 | 10.1 | 8.6 | -- | -- | -- | -- |
| 33 | Zurich, Switzerland | 8.7 | 9.4 | 14.2 | 11.1 | 6.7 | 8.4 | 10.7 | 7 | 7.2 | 9.2 | 8.9 | 4.9 | 7.4 | 10.4 | 11.3 | 8.9 | 10.9 | 11.2 | 10.4 |
| 34 | Sarnen, Switzerland | 8.6 | 10.6 | 11.2 | 12.4 | 6.9 | 8.3 | 10.2 | 7.2 | 7.3 | 8.3 | 8.4 | 5.1 | 7.7 | 8.5 | -- | -- | -- | -- | -- |
| 35 | Dozwil, Switzerland | 8.6 | 8.8 | 14 | 11 | 7 | 8.8 | 10 | 6.8 | 7 | 9.5 | 7.9 | 5.4 | 7.8 | 12.5 | -- | -- | -- | -- | -- |
| 36 | Vernier, Switzerland | 8.4 | -- | -- | -- | -- | 9.6 | 11.1 | 7.5 | 6.7 | 9.1 | 9.5 | 5.8 | 8.3 | -- | -- | -- | -- | -- | -- |
| 37 | Ebikon, Switzerland | 8.2 | 9 | 14.2 | 7.2 | 5.3 | 7.3 | 9.6 | 6.5 | 9 | 9.3 | 11.6 | 3.2 | 5.8 | -- | -- | -- | -- | -- | -- |
| 38 | Gambarogno, Switzerland | 8.2 | 9.2 | 19.4 | 15.2 | 8.1 | 5.2 | 6.6 | 6.9 | 9.9 | 7.4 | 5.7 | 3 | 4.6 | 11.6 | 10.1 | 10.2 | 10.3 | -- | -- |
| 39 | Binningen, Switzerland | 8.1 | 7.9 | 15.9 | 10 | 6.4 | 8.1 | 9.7 | 6 | 6.8 | 7 | 8.1 | 4.1 | 8.2 | 9.4 | 9.5 | 10.1 | 10.5 | 10.8 | 9.8 |
| 40 | Arbon, Switzerland | 8.1 | 8.4 | 11.8 | 9.8 | 6.4 | 8.3 | 9.7 | 6.7 | 6.9 | 8.3 | 8.5 | 4.7 | 7.5 | 9 | -- | -- | -- | -- | -- |
| 41 | La Tour-de-Peilz, Switzerland | 8 | 9.3 | 15.6 | 12.9 | 5.9 | 8.6 | 8.6 | 6.2 | 5.3 | 6.2 | 6.9 | 3.2 | 7.8 | 8.4 | 8.1 | 7.6 | 8.5 | 11 | -- |
| 42 | Opfikon, Switzerland | 8 | 8.3 | 11.9 | 9.4 | 6.3 | 7.7 | 9.5 | 6.7 | 7 | 8.1 | 8 | 5 | 7.5 | -- | -- | -- | -- | -- | -- |
| 43 | Winterthur, Switzerland | 8 | 9.1 | 12.6 | 9.7 | 6.1 | 8 | 10 | 6.5 | 6.8 | 7.9 | 7.8 | 4.3 | 6.6 | -- | -- | -- | -- | -- | -- |
| 44 | Martigny-Combe, Switzerland | 7.9 | 9.7 | 8.5 | 11.1 | 5.7 | 7 | 11.2 | 8.4 | 6.5 | 7.7 | 6.8 | 5.8 | 6.6 | -- | -- | -- | -- | -- | -- |
| 45 | Dübendorf, Switzerland | 7.9 | 8.1 | 13.6 | 9.9 | 6.8 | 7.2 | 11.5 | 6.3 | 7.2 | 7.8 | 7.9 | 2.8 | 6 | 9 | 10.4 | 14 | 13.7 | 10.4 | 9.6 |
| 46 | Embrach, Switzerland | 7.9 | 1.5 | 13.3 | 14.2 | 7.2 | 9.4 | 11.1 | 4.7 | 7.3 | 10.1 | 5.7 | 1.7 | 6.4 | 10.9 | 14.6 | -- | -- | -- | -- |
| 47 | Horn, Switzerland | 7.7 | 8.8 | 11 | 10.9 | 5.6 | 7.4 | 8.5 | 6 | 5.8 | 7.7 | 8 | 5.4 | 7.9 | 11.7 | 12.8 | -- | -- | -- | -- |
| 48 | Richterswil, Switzerland | 7.7 | 9.7 | 13.5 | 11.5 | 5.7 | 7.2 | 7.9 | 5 | 5.3 | 6.5 | 7.6 | 3.5 | 8.3 | -- | -- | -- | -- | -- | -- |
| 49 | Thalwil, Switzerland | 7.6 | -- | -- | -- | 6.2 | 8.5 | 10.4 | 6.7 | 6.6 | 8.8 | 8.7 | 4.6 | 7.2 | -- | -- | -- | -- | -- | -- |
| 50 | Kloten, Switzerland | 7.5 | 7.4 | 12 | 8.9 | 5.6 | 7.4 | 9.4 | 6.8 | 7.4 | 7.7 | 7.9 | 3.3 | 6 | 9.5 | 8.6 | 8.5 | 9 | -- | -- |
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