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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 |  Phan, Thailand | 51.9 | 39.2 | 75.6 | 125.4 | 153.1 | 39.8 | 12.4 | 7 | 10.8 | 10 | -- | -- | -- | 24 | 28.5 | 41.6 | -- | -- | -- |
| 2 | Chiang Rai, Thailand | 50.8 | 38.4 | 80 | 179.3 | 181.8 | 31.9 | 11 | 6.6 | 10 | 8.5 | 9.9 | 23.4 | 31.7 | 21.8 | 27.1 | 36.3 | 37 | -- | -- |
| 3 | Pai, Thailand | 50.3 | 29.5 | 57.8 | 145.4 | 157 | 30.1 | 10.4 | 4.5 | 7.5 | 4 | 9 | 7.6 | 24 | 27.1 | 47.1 | 53 | 38.9 | 29.4 | -- |
| 4 | Wiang, Thailand | 46.2 | 30.7 | 68.1 | 161.4 | 193.5 | 33.4 | 11.6 | 6.7 | 9 | 7.7 | 9.4 | 16.1 | 22.6 | 20.7 | -- | -- | -- | -- | -- |
| 5 | Mae Ka, Thailand | 45.5 | 20.4 | 98.2 | 163.3 | 140.3 | 32.7 | 10 | 5.9 | 11.4 | 6.5 | 8.1 | 18.1 | 23.5 | 36.6 | -- | -- | -- | -- | -- |
| 6 | Wiang Phang Kham,, Thailand | 43.9 | 33.3 | 60.3 | 117.8 | 232 | -- | 15.7 | 13.2 | 13.9 | 13.3 | 14.8 | 24.6 | 28.9 | 23.1 | -- | -- | -- | -- | -- |
| 7 | Nang Lae, Thailand | 42.7 | 21.7 | 46.7 | 106.7 | 116.3 | 25.3 | 7.1 | -- | 6 | 4.9 | 5.4 | -- | -- | 17.5 | -- | -- | -- | -- | -- |
| 8 | Mae Kon, Thailand | 40.9 | 39.8 | 72.9 | 123.4 | 128.2 | 31 | 11.6 | 6 | 9.2 | 7.9 | 9.2 | 22 | 27.3 | -- | -- | -- | -- | -- | -- |
| 9 | Pong Yang Khok, Thailand | 40.1 | 44.5 | 88 | 99.2 | 104.9 | 35.4 | 9.8 | 5.4 | 11.5 | 7 | 10.7 | 20.2 | 29.4 | 26.4 | -- | -- | -- | -- | -- |
| 10 | Nai Wiang, Thailand | 39.9 | 42.4 | 76.7 | 102 | 124.3 | -- | 16.3 | 13.5 | 15.8 | 12.2 | 13.5 | 22.8 | 30.4 | 25.6 | -- | -- | -- | -- | -- |
| 11 | Wiang Nuea, Thailand | 39.4 | 33.8 | 67.1 | 144.8 | 134.8 | 28.4 | 12 | 7 | 9.4 | 6.8 | 9.1 | 13.7 | 21.8 | -- | -- | -- | -- | -- | -- |
| 12 | Nong Jom, Thailand | 38.1 | 34.5 | 55.7 | 98.1 | 121.9 | 23.8 | 10.1 | 5.1 | 11.1 | 7.1 | 9.5 | 17.9 | 23.8 | 23.7 | -- | -- | -- | -- | -- |
| 13 | Talat Khwan, Thailand | 38.1 | 34.4 | 54.1 | 103.4 | 129.9 | 29.2 | 10.4 | 6.3 | 12.2 | 8.8 | 9.9 | 21 | 29.1 | -- | -- | -- | -- | -- | -- |
| 14 | Nong Hoi, Thailand | 37.7 | 45.4 | 72.6 | 108.9 | 104.2 | 32.1 | 11.8 | 7.8 | 13 | 9 | 8.8 | 15.8 | 22.6 | -- | -- | -- | -- | -- | -- |
| 15 | Doi Saket, Thailand | 37.5 | 44.9 | 64 | 103.7 | 107.9 | 31 | 10.5 | 6.2 | 11.4 | 7.9 | 10.1 | 22.4 | 32.1 | 21.5 | 27.7 | 17.4 | 16.2 | -- | -- |
| 16 | Nam Phrae, Thailand | 37.5 | 27.9 | 48.9 | 106.1 | 132.9 | 28 | 8.6 | 4.6 | 8.7 | 5.5 | 10.6 | 18.1 | -- | 23 | -- | -- | -- | -- | -- |
| 17 | Pa Sak, Thailand | 37.3 | 38.5 | 57.4 | 98.8 | 122.1 | 30.9 | 9.8 | 6 | 10.5 | 7 | 8.9 | 18.2 | 26.1 | 22.7 | -- | -- | -- | -- | -- |
| 18 | Chiang Khong, Thailand | 37.3 | 28.7 | 68.9 | 101.7 | 195.1 | -- | -- | 9.9 | 8.1 | 9.6 | 9.1 | 8.3 | 9.9 | -- | -- | -- | -- | -- | -- |
| 19 | Nan, Thailand | 37 | 36.6 | 74.6 | 100 | 96.8 | 34.2 | 13.2 | 10.6 | 17.1 | 9.5 | 9 | 14.5 | 19.7 | 30.4 | 39.5 | 32.5 | -- | -- | -- |
| 20 | Mae Rim, Thailand | 36.9 | -- | -- | 119.7 | 140.7 | 32 | 11.1 | 6.5 | 11.7 | 6.6 | 8.8 | 16.1 | 23.7 | -- | -- | -- | -- | -- | -- |
| 21 | Tha Sala, Thailand | 36.9 | 36.4 | 50.2 | 83.6 | 90.9 | 23.3 | 8.4 | 5.8 | 8.7 | 6.4 | 9.6 | 18.9 | 26.2 | -- | -- | -- | -- | -- | -- |
| 22 | Tha Wasukri, Thailand | 36.1 | 51.6 | 63.6 | 63.7 | 60.7 | 31.5 | 14.2 | 12.1 | 20.1 | 16 | 24.2 | 33.1 | 40.5 | 28.8 | -- | -- | -- | -- | -- |
| 23 | Phaya Kaeo, Thailand | 35.1 | 27.6 | 55.1 | 114.5 | 168.8 | -- | 8.8 | 9.4 | 11 | 8.6 | 9.9 | 15.5 | 20 | 18.2 | -- | -- | -- | -- | -- |
| 24 | Mae Hia, Thailand | 34.9 | 35.6 | 56.5 | 102.8 | 116.2 | 28.3 | 9.2 | 5.7 | 10.8 | 6.2 | 8.2 | 17.4 | 24.3 | -- | -- | -- | -- | -- | -- |
| 25 | Yang Sai, Thailand | 34.8 | 48.5 | 72.3 | 85 | 70.2 | 29.4 | 9.2 | 7.2 | 13.4 | 8.1 | 10 | 25.3 | 35.2 | 27.3 | -- | -- | -- | -- | -- |
| 26 | Rop Wiang, Thailand | 34.6 | 33.6 | 56.9 | 107.8 | 124.5 | 21.7 | 9.8 | 7.1 | 7.6 | 6.6 | 7.6 | 17.2 | 23.6 | 18.8 | -- | -- | -- | -- | -- |
| 27 | Ban Tom, Thailand | 34.5 | 37.2 | 60 | 95.1 | 132.8 | -- | 12.9 | 10 | 12.1 | 9.2 | 10.9 | 18.7 | 25.6 | -- | -- | -- | -- | -- | -- |
| 28 | Chaiyasathan, Thailand | 34.3 | 18.7 | 50.5 | 80.1 | 83.9 | 17.8 | 4.8 | 2.5 | 4.7 | -- | -- | -- | 12 | -- | -- | -- | -- | -- | -- |
| 29 | Pong Pha, Thailand | 34 | 23.4 | 42.1 | 105.5 | 119.6 | 21.3 | 7.8 | 4.9 | 4.6 | 4.6 | 6.4 | 14.8 | 19 | -- | -- | -- | -- | -- | -- |
| 30 | San Sai, Thailand | 33.6 | 36.1 | 52 | 98.5 | 120.9 | 26.1 | 9.2 | 5.1 | 10.5 | 5.9 | 8.1 | 15.8 | 21.5 | -- | -- | -- | -- | -- | -- |
| 31 | Bo Haeo, Thailand | 33.5 | 51.2 | 96.1 | 93.9 | 89.4 | 19.1 | 3.3 | 2.3 | 3.5 | 2.8 | 3.8 | 7.6 | 11.5 | -- | -- | -- | -- | -- | -- |
| 32 | Na Phra Lan, Thailand | 33.5 | 43.9 | 54.5 | 53.9 | 46.7 | -- | 19.6 | 20.6 | 24.8 | 24 | 26.8 | 26.9 | 29.4 | 67.4 | -- | -- | -- | -- | -- |
| 33 | Chiang Mai, Thailand | 33.4 | 34.7 | 56.7 | 97.8 | 104.2 | 27.2 | 8.9 | 5.3 | 10.8 | 6.4 | 9 | 16.8 | 24.8 | 18.4 | 24.9 | 30.5 | 32.3 | 24.5 | 22.7 |
| 34 | Rim Kok, Thailand | 33.2 | 26.6 | 53.6 | 110.6 | 123.7 | 23.6 | 6.9 | 3.8 | 5.3 | 5 | 5.2 | 14.8 | 17.4 | 19.1 | -- | -- | -- | -- | -- |
| 35 | Ko Rian, Thailand | 33.2 | 41.8 | 57.7 | 63.4 | 64.9 | 30.3 | 13.2 | 10.5 | 16.2 | 14.1 | 23.5 | 30.2 | 33 | -- | -- | -- | -- | -- | -- |
| 36 | Bang Phrom, Thailand | 33.2 | 52.2 | 59.2 | 57 | 56.7 | 26.2 | 13 | 11.3 | 13.3 | 9.1 | 21.1 | 37 | 44.6 | 23.3 | -- | -- | -- | -- | -- |
| 37 | Loei, Thailand | 32.8 | 31.2 | 52.4 | 81.9 | 93.9 | -- | 11.3 | 8.7 | 15.1 | 6.2 | 6.9 | 19.8 | 24.7 | -- | -- | -- | -- | -- | -- |
| 38 | Tha Phon, Thailand | 32.8 | 37.7 | 58.1 | 78.9 | 67 | 34.8 | 15.1 | 12.9 | 19.3 | 10.6 | 15.6 | 23.2 | 22.2 | -- | -- | -- | -- | -- | -- |
| 39 | Chang Khoeng, Thailand | 32.5 | 33.1 | 69.6 | 94 | 138.1 | -- | -- | 9.3 | 7.9 | 8.7 | 8.7 | 8.1 | 12 | 29 | -- | -- | -- | -- | -- |
| 40 | Mae On, Thailand | 32.5 | 33.2 | 54.3 | 87.2 | 97.8 | 32.4 | 11.8 | 6.6 | 11.9 | 7.3 | 9.9 | 16.7 | 20.7 | 32.6 | 56.9 | -- | -- | -- | -- |
| 41 | Pak Nam, Thailand | 32.5 | 39.3 | 48.5 | 40.6 | 43.9 | -- | 18.8 | 20.5 | 20.6 | 18.9 | 27.5 | 37.8 | 43.5 | 30.4 | -- | -- | -- | -- | -- |
| 42 | Pak Khwae, Thailand | 32.2 | 39.9 | 63.5 | 83.6 | 74.6 | 27 | 8.3 | 6.1 | 12.4 | 6.6 | 5.3 | 20.3 | 27.2 | -- | -- | -- | -- | -- | -- |
| 43 | Suthep, Thailand | 32.1 | 31.6 | 52.2 | 96.5 | 103.9 | 27.8 | 9 | 4.7 | 10.1 | 6.1 | 8.2 | 15.9 | 21.1 | -- | -- | -- | -- | -- | -- |
| 44 | Ban Waen, Thailand | 31.9 | 38.7 | 52.6 | 87.1 | 95.3 | 23.6 | 8.4 | 5.6 | 9.7 | 5.9 | 8.8 | 20.8 | 26.7 | 25.4 | -- | -- | -- | -- | -- |
| 45 | Lat Sawai, Thailand | 31.9 | 36.8 | 45.9 | 49.5 | 49.7 | 25.8 | 11.5 | 10.1 | -- | -- | 23.2 | 26.4 | 30.5 | 23.2 | -- | -- | -- | -- | -- |
| 46 | Chang Klan, Thailand | 31.7 | 36.6 | 67.1 | 120.2 | 109.1 | 33.3 | 11.2 | 6.9 | 13 | 8.2 | 11.6 | 21.9 | 28.5 | -- | -- | -- | -- | -- | -- |
| 47 | Wiang Chai, Thailand | 31.7 | -- | -- | 252.5 | 120.9 | 30.8 | 9.7 | 6 | 8.8 | 7.8 | 9.6 | 20.8 | 25.7 | -- | -- | -- | -- | -- | -- |
| 48 | Pang Mu, Thailand | 31.7 | 26.6 | 43.3 | 131.7 | 143.1 | -- | 7 | 4.3 | 7.2 | 5.3 | 5.1 | 9.3 | 14.5 | 22.7 | -- | -- | -- | -- | -- |
| 49 | Mae Pa, Thailand | 31.7 | 41.3 | 78 | 80.6 | 57.5 | -- | 9.8 | 9.9 | 12.1 | 9 | 11.7 | 19.6 | 30.6 | 19.1 | -- | -- | -- | -- | -- |
| 50 | Mueang, Thailand | 31.3 | 43.5 | 58.7 | 80.4 | 83 | 28.9 | 10.6 | 7.1 | 10.6 | 7 | 10.3 | 18.1 | 25 | -- | -- | -- | -- | -- | -- |
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