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 Apr 2024 That day's board

The worst cities in Thailand for PM2.5 over the 30 days to 19 Apr 2024: Chiang Khong 98.7 µg/m³, Mae Sai 97.5 µg/m³ and Chiang Mai 78.4 µg/m³.

  1. 1Chiang KhongChiang Rai98.7
  2. 2Mae SaiChiang Rai97.5
  3. 3Chiang MaiChiang Mai78.4
  4. 4PhayaoPhayao72.0
  5. 5NanNan70.9
  6. 6LampangLampang69.2
  7. 7LamphunLamphun68.5
  8. 8Chiang RaiChiang Rai63.9
  9. 9KalasinKalasin63.5
  10. 10Ubon RatchathaniUbon Ratchathani62.9
  11. 11Tha BoNong Khai62.7
  12. 12UttaraditUttaradit61.7
  13. 13MukdahanMukdahan61.1
  14. 14PhraePhrae57.1
  15. 15Mae SotTak55.3
  16. 16SukhothaiSukhothai54.1
  17. 17Kamphaeng PhetKamphaeng Phet53.1
  18. 18YasothonYasothon52.1
  19. 19LoeiLoei51.7
  20. 20Amnat CharoenAmnat Charoen50.4

+ 60 more cities, 48.9 µg/m³ and below

Not counted on this day, too few days measured: Bueng Kum since 26 Mar 2024, Ban Thai Tan since 18 Mar 2024, Ban Samae Dam since 10 Mar 2024 and Lak Si since 22 Feb 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.