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.
The worst cities in Thailand for PM2.5 over the 30 days to 13 Jun 2025: Ban Talat Bueng 32.2 µg/m³, Yasothon 23.7 µg/m³ and Bang Na 23.1 µg/m³.
- 1Ban Talat BuengChon Buri32.2
- 2YasothonYasothon23.7
- 3Bang NaBangkok23.1
- 4Khlong LuangPathum Thani20.7
- 5MukdahanMukdahan20.0
- 6Roi EtRoi Et19.7
- 7Bang Bo DistrictSamut Prakan19.2
- 8Khlong Sam WaBangkok18.4
- 9Ban Samae DamBangkok18.3
- 10Amnat CharoenAmnat Charoen18.3
- 11Saphan SungBangkok18.0
- 12Khan Na YaoBangkok17.9
- 13Ban ChangRayong17.0
- 14KanchanaburiKanchanaburi16.5
- 15Phra PradaengSamut Prakan16.4
- 16Nong Bua LamphuNong Bua Lamphu16.2
- 17Mae SaiChiang Rai16.0
- 18KalasinKalasin16.0
- 19Samut SakhonSamut Sakhon15.9
- 20Si Maha PhotPrachin Buri15.8
+ 58 more cities, 15.8 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.
Cities counted each 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.