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 Sep 2023: Tha Bo 50.2 µg/m³, Samut Sakhon 20.9 µg/m³ and Nong Khaem 17.1 µg/m³.
- 1Tha BoNong Khai50.2
- 2Samut SakhonSamut Sakhon20.9
- 3Nong KhaemBangkok17.1
- 4Bang Bo DistrictSamut Prakan15.8
- 5BangkokBangkok15.5
- 6Phra PradaengSamut Prakan14.1
- 7Khlong LuangPathum Thani13.1
- 8Bang KapiBangkok12.3
- 9Samut PrakanSamut Prakan12.1
- 10Nakhon PathomNakhon Pathom11.7
- 11Mueang NonthaburiNonthaburi10.4
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.