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 16 Sep 2024: Bang Na 23.9 µg/m³, Samut Sakhon 16.1 µg/m³ and Saphan Sung 15.5 µg/m³.
- 1Bang NaBangkok23.9
- 2Samut SakhonSamut Sakhon16.1
- 3Saphan SungBangkok15.5
- 4Khan Na YaoBangkok15.0
- 5Nong KhaemBangkok14.9
- 6Phra PradaengSamut Prakan14.7
- 7Khlong LuangPathum Thani14.1
- 8BangkokBangkok13.7
- 9Bang KapiBangkok11.7
- 10Mueang NonthaburiNonthaburi11.1
- 11Ban Khlong PrawetBangkok11.0
- 12Nakhon PathomNakhon Pathom10.7
- 13Samut PrakanSamut Prakan10.3
- 14Sai MaiBangkok10.0
- 15Tha BoNong Khai7.7
Not counted on this day, too few days measured: Bang Bo District since 9 Sep 2024, Lat Krabang since 2 Sep 2024, Sukhothai since 19 Aug 2024 and 37 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.