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 21 Nov 2023: Samut Sakhon 36.2 µg/m³, Tha Bo 32.7 µg/m³ and Nong Khaem 28.6 µg/m³.
- 1Samut SakhonSamut Sakhon36.2
- 2Tha BoNong Khai32.7
- 3Nong KhaemBangkok28.6
- 4BangkokBangkok24.6
- 5Mueang NonthaburiNonthaburi23.8
- 6Nakhon PathomNakhon Pathom22.4
- 7Phra PradaengSamut Prakan22.1
- 8Khlong LuangPathum Thani21.5
- 9Bang Bo DistrictSamut Prakan20.9
- 10Samut PrakanSamut Prakan20.2
Not counted on this day, too few days measured: Bang Kapi since 12 Oct 2023.
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.