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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1751 |  Olongapo, Philippines | 14.9 | 11.5 | 12.9 | 18.1 | 26.7 | 16.6 | 17.9 | 14 | 9.4 | 18.1 | 11.3 | 11.4 | 11.2 | 13.7 | 10.3 | -- | -- | -- | -- |
| 1752 |  Nakło nad Notecią, Poland | 14.9 | 19.6 | 23.4 | 21.6 | 14.8 | 9.2 | 8.7 | 6.4 | 7.3 | 10.9 | 13.7 | 19.5 | 23.8 | -- | -- | -- | -- | -- | -- |
| 1753 | Chelm, Poland | 14.9 | 17 | 19.8 | 16.7 | 17.3 | 19.9 | 10.3 | 9.3 | 11.3 | 17.9 | 15.3 | 13 | 19.8 | 15.5 | 17.2 | 16.4 | -- | -- | -- |
| 1754 |  Sremski Karlovci, Serbia | 14.9 | 21.2 | 29.7 | 17.3 | 15.3 | 11.5 | 10.8 | 10.3 | 12.2 | 11.2 | 12 | 11.8 | 18.3 | -- | -- | -- | -- | -- | -- |
| 1755 |  Ruzomberok, Slovakia | 14.9 | 23.5 | 33.9 | 16.4 | 11.3 | 9.8 | 11.5 | 10.8 | 9.1 | 9.2 | 10.2 | 9.9 | 24.4 | 17.3 | 18.3 | 19.6 | 18.5 | 20.7 | 24.4 |
| 1756 |  Yeoncheon, South Korea | 14.9 | 20.8 | 23.4 | 23.1 | 14.2 | 12.3 | 11 | 13.3 | 8.2 | 7.4 | 10.4 | 14 | 16.7 | 14 | 16.1 | -- | 21.8 | 20.6 | 25.8 |
| 1757 |  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 | -- | -- |
| 1758 |  Ratchaburi, Thailand | 14.9 | 12.1 | 35 | 32.4 | 25.5 | 8.5 | 3.7 | 2.4 | 2.3 | 1.8 | 7.6 | 16.4 | 23.2 | 16.4 | 21.6 | 22.8 | 29.5 | 32.2 | 22.4 |
| 1759 |  Kemerburgaz, Turkey | 14.9 | 17.2 | 17.2 | 15.3 | 12.2 | 12.9 | 12.8 | 12.8 | 13.7 | 11.3 | 20.7 | 15.4 | 18.2 | -- | -- | -- | -- | -- | -- |
| 1760 |  Cutler, USA | 14.9 | 14.9 | 17.5 | 8.9 | 14.2 | 9.7 | 12.8 | 15.4 | 16 | 16.6 | 14.6 | 17.8 | 25.6 | 15.3 | 24.7 | -- | -- | -- | -- |
| 1761 | Salton City, USA | 14.9 | 5.2 | 18.6 | 22.7 | 36 | 32.9 | 21.7 | 8.9 | 6.3 | 10.9 | 5.4 | 6.1 | 6.9 | 8.5 | 6.8 | -- | -- | -- | -- |
| 1762 | Homer, USA | 14.9 | -- | -- | 14.1 | 10.4 | 11.7 | 35.3 | 17.4 | 18.7 | 14.3 | 7.8 | 10.5 | 10 | -- | -- | -- | -- | -- | -- |
| 1763 | Columbia, USA | 14.9 | 15.8 | 15.7 | 11.1 | 11.5 | 12.2 | 33.9 | 18.9 | 15.4 | 11.7 | 7.6 | 11.1 | 15.3 | 18.8 | -- | -- | -- | -- | -- |
| 1764 |  Mostar, Bosnia Herzegovina | 14.8 | 20.5 | 23.4 | 14.9 | 11.9 | 10.4 | 11.7 | 11.6 | 15.6 | 10.2 | 7.5 | 12 | 30 | 15.4 | 10.8 | -- | -- | -- | -- |
| 1765 |  Cold Lake, Canada | 14.8 | 10.2 | 4.2 | 5.9 | 5.2 | 30.2 | 22.6 | 25.2 | 21.2 | 34.4 | 4.6 | 6.7 | 6.2 | 7.1 | 8.1 | 4.9 | 4.4 | -- | -- |
| 1766 | Leduc, Canada | 14.8 | 10.7 | 4.8 | 10.2 | 5.4 | 34.9 | 19.2 | 25.7 | 17.1 | 29.2 | 5.8 | 8.3 | 5.2 | 7.9 | 12.9 | -- | -- | -- | -- |
| 1767 |  Paralimni, Cyprus | 14.8 | -- | -- | 10 | 10.7 | 17.6 | 16.3 | 14.1 | 19.3 | 12.3 | 15.7 | 14.3 | 15.4 | 17.3 | 15.9 | 14.3 | 15.9 | 18.4 | -- |
| 1768 |  Děčín, Czech Republic | 14.8 | 16.4 | 20.8 | 17.4 | 14.8 | 13.2 | 12.6 | 9.9 | 11.2 | 13.4 | 15.2 | 13.1 | 20.3 | 16 | 17.1 | 16.4 | 17.8 | 23.1 | 23 |
| 1769 |  Bergamo, Italy | 14.8 | 24.3 | 30.3 | 20 | 11.4 | 9 | 10.7 | 9.5 | 8.3 | 9.2 | 13.9 | 11.7 | 19.6 | 17.6 | 17.6 | 17.8 | 18.5 | 18 | 26.4 |
| 1770 | Como, Italy | 14.8 | 21.1 | 29.7 | 19.1 | 10.8 | 10.5 | 11.8 | 10.8 | 10.1 | 11.1 | 16.5 | 6.5 | 22.2 | 14.7 | 20.4 | -- | -- | -- | -- |
| 1771 | Makati, Philippines | 14.8 | 15.9 | 15.9 | 15.7 | 22.8 | 15.1 | 19.7 | 18.1 | 13.6 | 17.7 | 11 | 9.8 | 9.4 | 14.7 | 8.9 | -- | -- | -- | -- |
| 1772 | Kurdwanow, Poland | 14.8 | 16.6 | 25 | 16.3 | 14.5 | 11.4 | 10.2 | 8 | 9.2 | 11.8 | 12.6 | 15.9 | 42.9 | 16.3 | 20.4 | 16.8 | 23.4 | -- | -- |
| 1773 | Nysa, Poland | 14.8 | 21.7 | 21.1 | 18.8 | 15.4 | 11.7 | 9.1 | 7 | 5.9 | 8.2 | 12.5 | 13.9 | 32.5 | 19.6 | 19.4 | -- | -- | -- | -- |
| 1774 | Zrenjanin, Serbia | 14.8 | 22.1 | 29.1 | 16.8 | 11 | 8.8 | 8.7 | 9.3 | 8.9 | 10.3 | 14.7 | 13.1 | 24.9 | 32.5 | -- | -- | -- | -- | -- |
| 1775 | Nad Jazerom, Slovakia | 14.8 | 16.4 | 22.5 | 17.5 | 11.9 | 10.8 | 12.2 | 13.6 | 14.8 | 12.6 | 12.3 | 11.9 | 21.4 | 10.3 | 18.4 | 15.1 | 14.4 | -- | -- |
| 1776 | Ko Samui, Thailand | 14.8 | 19.3 | 20.4 | 21.6 | 34.8 | 13.2 | 8.7 | 9.7 | 7.9 | 8.5 | 9.7 | 12.6 | 15.3 | 5.3 | -- | -- | -- | -- | -- |
| 1777 | 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 | -- | -- | -- | -- |
| 1778 | Beloit, USA | 14.8 | 12.1 | 7.9 | 11.3 | 10.3 | 10.7 | 41.7 | 18 | 17.6 | 12.3 | 7.5 | 13.7 | -- | 10.4 | -- | -- | -- | -- | -- |
| 1779 | Meadow Lake, Canada | 14.7 | 14.7 | 8.3 | 7.3 | 4.5 | 20.1 | 22.3 | 20.9 | 21.4 | 20.7 | 3.2 | 9.7 | -- | 8 | 15.8 | -- | -- | -- | -- |
| 1780 |  Da hinggan Ling, China | 14.7 | 21.6 | 19.9 | 14.5 | 14.3 | 11 | 9.4 | 14.8 | 10.9 | 10.5 | 15.5 | 17.3 | 17.5 | 12.6 | 14 | 14.3 | 19.9 | 17.8 | 17.8 |
| 1781 | Tesin, Czech Republic | 14.7 | 16.8 | 28.5 | 22.6 | 17.5 | 14 | 12.4 | 9.7 | 9.3 | 11.4 | 9.3 | 10.2 | 35.8 | 17.6 | 19.5 | 17.9 | 20 | 29.6 | 27.2 |
| 1782 |  Neapoli, Greece | 14.7 | 22.2 | 22.1 | 27.8 | -- | 16.1 | 18.7 | -- | 16.7 | 13.3 | 11.1 | 5.4 | 8.3 | 17.5 | -- | -- | -- | -- | -- |
| 1783 |  Kasaoka, Japan | 14.7 | 14.5 | 13.7 | 18.5 | 17.7 | 14.2 | 16 | 14.2 | 11.5 | 13 | 12.7 | 15.3 | 15 | 14.6 | 14.1 | 14.4 | 15.7 | 17.1 | 17 |
| 1784 |  Nikšić, Montenegro | 14.7 | 4 | 10.2 | 12.9 | 4.3 | 7.6 | 9.2 | 10 | 10.8 | 8.9 | 12.5 | 29.1 | 52.9 | 11.4 | 30.5 | 28.7 | -- | -- | -- |
| 1785 | Rizal, Philippines | 14.7 | 13 | 12.8 | 10.9 | 17.7 | 15.6 | 15.1 | 14.4 | 11.1 | 24.4 | 14.3 | 15 | 11.5 | 15.8 | 19.4 | -- | -- | -- | -- |
| 1786 | Davao City, Philippines | 14.7 | 12.1 | 11.8 | 11.5 | 13.6 | 13.3 | 14.7 | 15.4 | 19.4 | 18.2 | 19.4 | 14.6 | 12.6 | 13.9 | 11 | -- | -- | -- | -- |
| 1787 | Koscian, Poland | 14.7 | -- | -- | 16.8 | 18.2 | 12 | 12.2 | 8.5 | 9.1 | 13.5 | 14.9 | 17.5 | 28.6 | -- | -- | -- | -- | -- | -- |
| 1788 | Legnica, Poland | 14.7 | 17.7 | 21.4 | 19.9 | 21 | 15.8 | 14.7 | 8.6 | 9.4 | 12.5 | 8.6 | 8.6 | 17.5 | 18.3 | 16.4 | 17 | -- | -- | -- |
| 1789 | Lukow, Poland | 14.7 | -- | -- | 12.7 | 14.1 | 11.2 | 12.2 | 10.8 | 12.4 | 16.6 | 15.4 | 18.9 | 21.1 | -- | -- | -- | -- | -- | -- |
| 1790 | Sosnowiec, Poland | 14.7 | 16.8 | 20.9 | 17.2 | 15.2 | 12.5 | 12.6 | 10.7 | 11.6 | 13.5 | 13.5 | 12.6 | 26.8 | 16.7 | 19.9 | 17.3 | -- | -- | -- |
| 1791 | Rymanów-Zdrój, Poland | 14.7 | 15.9 | 22.8 | 18.2 | 14.3 | 11.9 | 11.6 | 9.9 | 14 | 13.9 | 11.9 | 11.8 | 20.7 | 9 | 10.4 | 11.7 | 15.8 | 14.6 | 18.2 |
| 1792 |  Radauti, Romania | 14.7 | 18.9 | 20.5 | 18.9 | 12.9 | 10.7 | 9.7 | 9.2 | 12.2 | 13.2 | 12.8 | 14.2 | 23.5 | 17.7 | 20.3 | -- | -- | -- | -- |
| 1793 | Martin, Slovakia | 14.7 | 16.4 | 25.5 | 16.3 | 12.8 | 11.2 | 13.2 | 13.4 | 11.3 | 12.8 | 11.5 | 10.4 | 22.4 | 17.3 | 20.6 | 15.7 | 16.1 | 18 | 22.1 |
| 1794 |  Secunda, South Africa | 14.7 | 3.1 | 1.9 | 0 | 2.7 | 14.1 | 25.2 | 26 | 27.4 | 25.6 | 18.6 | 15.8 | 12.2 | 14.4 | 17.5 | 21.8 | 27.3 | -- | -- |
| 1795 | Chuncheon, South Korea | 14.7 | 24.6 | 25.3 | 23.7 | 15.6 | 13.9 | 9.9 | 9.6 | 6 | 6.1 | 11.6 | -- | 18.5 | 15.1 | 16.5 | -- | 22.5 | 21.3 | 24.2 |
| 1796 |  Puli Township, Taiwan | 14.7 | 18.2 | 15.2 | 21.1 | 18.7 | 16 | 6.4 | 4.4 | 7 | 14.3 | 17.3 | 19.7 | 13.4 | -- | -- | -- | -- | -- | -- |
| 1797 | Kho Hong, Thailand | 14.7 | 15.4 | 14.1 | 17.8 | 24.5 | 14.2 | 16.5 | 13.1 | 13.6 | 16.8 | 12.3 | 7.2 | 6.6 | -- | -- | -- | -- | -- | -- |
| 1798 | Bilecik, Turkey | 14.7 | 17.6 | 14.8 | 17 | 13.9 | 14.9 | 11.7 | 11.3 | 13.1 | 12.1 | 15.6 | 14.8 | 20 | 12 | 16.4 | 15.8 | 17.8 | -- | -- |
| 1799 | Sisli, Turkey | 14.7 | 19.5 | 15.8 | 14.7 | 12.8 | 13.3 | 12.4 | 15.7 | 15.8 | 11.8 | 19.7 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1800 | Orleans, USA | 14.7 | 6 | 7.1 | 5 | 3.3 | 3.7 | 4.7 | 11.7 | 63.7 | 51.3 | 6 | 7.4 | 4.6 | 8.3 | 19.6 | 20.8 | 8.2 | -- | -- |
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