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 25 May 2023: Tha Bo 31.3 µg/m³, Nong Khaem 26.7 µg/m³ and Khlong Luang 25.5 µg/m³.
- 1Tha BoNong Khai31.3
- 2Nong KhaemBangkok26.7
- 3Khlong LuangPathum Thani25.5
- 4Bang KapiBangkok23.9
- 5BangkokBangkok23.8
- 6Bang Bo DistrictSamut Prakan22.2
- 7Mueang NonthaburiNonthaburi21.2
- 8Phra PradaengSamut Prakan21.1
- 9Samut PrakanSamut Prakan20.6
- 10Nakhon PathomNakhon Pathom20.5
- 11Samut SakhonSamut Sakhon19.2
Not counted on this day, too few days measured: Bang Khun Thian since 30 Apr 2023, Trang since 26 Apr 2023, Sukhothai since 26 Apr 2023 and 39 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.