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 14 Jan 2025: Tha Bo 44.9 µg/m³, Khlong Sam Wa 44.0 µg/m³ and Nong Khaem 43.9 µg/m³.
- 1Tha BoNong Khai44.9
- 2Khlong Sam WaBangkok44.0
- 3Nong KhaemBangkok43.9
- 4Lak SiBangkok40.0
- 5Bang NaBangkok39.9
- 6Bueng KumBangkok39.6
- 7Ban Samae DamBangkok39.1
- 8Khan Na YaoBangkok39.1
- 9Saphan SungBangkok37.7
- 10Lat KrabangBangkok37.3
- 11BangkokBangkok36.6
- 12Mueang NonthaburiNonthaburi36.4
- 13Bang KapiBangkok36.0
- 14Nong ChokBangkok35.5
- 15Sai MaiBangkok35.5
- 16Ban Khlong PrawetBangkok34.5
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.