SmogRank / History / City race

Cities in Thailand, worst air first, day by day

Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.

CountriesCities
The 30 days to19 May 2024 That day's board

The worst cities in Thailand for PM2.5 over the 30 days to 19 May 2024: Chiang Khong 87.0 µg/m³, Ubon Ratchathani 64.2 µg/m³ and Phayao 59.1 µg/m³.

  1. 1Chiang KhongChiang Rai87.0
  2. 2Ubon RatchathaniUbon Ratchathani64.2
  3. 3PhayaoPhayao59.1
  4. 4NanNan57.4
  5. 5Mae SaiChiang Rai57.0
  6. 6Chiang RaiChiang Rai55.9
  7. 7Chiang MaiChiang Mai53.1
  8. 8LampangLampang52.8
  9. 9UttaraditUttaradit47.0
  10. 10MukdahanMukdahan46.3
  11. 11KalasinKalasin45.5
  12. 12PhraePhrae42.5
  13. 13LamphunLamphun42.3
  14. 14Bueng KanBueng Kan41.8
  15. 15Tha BoNong Khai40.7
  16. 16Kamphaeng PhetKamphaeng Phet39.8
  17. 17SukhothaiSukhothai39.7
  18. 18Amnat CharoenAmnat Charoen38.4
  19. 19LoeiLoei36.0
  20. 20YasothonYasothon34.9

+ 64 more cities, 34.8 µg/m³ and below

Not counted on this day, too few days measured: Bueng Kum since 26 Mar 2024.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that day

A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.

Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.