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 Feb 2025 That day's board

The worst cities in Thailand for PM2.5 over the 30 days to 16 Feb 2025: Phetchaburi 60.5 µg/m³, Khlong Luang 58.9 µg/m³ and Sing Buri 57.1 µg/m³.

  1. 1PhetchaburiPhetchaburi60.5
  2. 2Khlong LuangPathum Thani58.9
  3. 3Sing BuriSing Buri57.1
  4. 4Nakhon LuangPhra Nakhon Si Ayutthaya56.6
  5. 5Khlong Sam WaBangkok55.9
  6. 6Prachin BuriPrachin Buri55.7
  7. 7Khan Na YaoBangkok54.8
  8. 8Nong ChokBangkok54.5
  9. 9Bang NaBangkok54.5
  10. 10RatchaburiRatchaburi54.2
  11. 11Nong KhaemBangkok53.4
  12. 12Bueng KumBangkok53.2
  13. 13PhraePhrae52.8
  14. 14Lop BuriLopburi52.7
  15. 15SukhothaiSukhothai52.6
  16. 16Tha BoNong Khai52.5
  17. 17NanNan52.4
  18. 18Lat KrabangBangkok52.3
  19. 19TratTrat51.1
  20. 20AranyaprathetSa Kaeo51.0

+ 43 more cities, 49.7 µg/m³ and below

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.