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 17 Jan 2025: Tha Bo 46.5 µg/m³, Nong Khaem 45.1 µg/m³ and Khlong Sam Wa 45.0 µg/m³.
- 1Tha BoNong Khai46.5
- 2Nong KhaemBangkok45.1
- 3Khlong Sam WaBangkok45.0
- 4Lak SiBangkok41.4
- 5Bang NaBangkok41.0
- 6Bueng KumBangkok40.7
- 7Khan Na YaoBangkok40.4
- 8Ban Samae DamBangkok40.1
- 9Saphan SungBangkok38.8
- 10Lat KrabangBangkok38.6
- 11BangkokBangkok37.8
- 12Mueang NonthaburiNonthaburi37.6
- 13Bang KapiBangkok37.2
- 14Nong ChokBangkok37.0
- 15Sai MaiBangkok36.9
- 16Ban Khlong PrawetBangkok35.5
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.