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 24 Nov 2023: Samut Sakhon 39.1 µg/m³, Tha Bo 33.9 µg/m³ and Nong Khaem 29.5 µg/m³.
- 1Samut SakhonSamut Sakhon39.1
- 2Tha BoNong Khai33.9
- 3Nong KhaemBangkok29.5
- 4BangkokBangkok25.3
- 5Mueang NonthaburiNonthaburi25.2
- 6Nakhon PathomNakhon Pathom24.5
- 7Khlong LuangPathum Thani22.9
- 8Phra PradaengSamut Prakan22.7
- 9Bang Bo DistrictSamut Prakan21.8
- 10Samut PrakanSamut Prakan21.2
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.