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 to16 Jun 2025 That day's board

The worst cities in Thailand for PM2.5 over the 30 days to 16 Jun 2025: Ban Talat Bueng 34.1 µg/m³, Bang Na 22.4 µg/m³ and Yasothon 22.3 µg/m³.

  1. 1Ban Talat BuengChon Buri34.1
  2. 2Bang NaBangkok22.4
  3. 3YasothonYasothon22.3
  4. 4Khlong LuangPathum Thani20.5
  5. 5Roi EtRoi Et20.3
  6. 6MukdahanMukdahan20.0
  7. 7Bang Bo DistrictSamut Prakan18.6
  8. 8Ban Samae DamBangkok17.8
  9. 9Amnat CharoenAmnat Charoen17.8
  10. 10Khlong Sam WaBangkok17.7
  11. 11Khan Na YaoBangkok17.4
  12. 12Saphan SungBangkok17.4
  13. 13Nong Bua LamphuNong Bua Lamphu16.5
  14. 14Ban ChangRayong16.3
  15. 15Si Maha PhotPrachin Buri16.2
  16. 16Mae SaiChiang Rai16.1
  17. 17KanchanaburiKanchanaburi15.7
  18. 18Phra PradaengSamut Prakan15.5
  19. 19KalasinKalasin15.4
  20. 20SadaoSongkhla15.2

+ 57 more cities, 15.2 µg/m³ and below

Not counted on this day, too few days measured: Nakhon Luang since 3 May 2025, Nakhon Sawan since 2 May 2025, Mae Sot since 26 Apr 2025 and 2 more cities.

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.