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 27 Jun 2023: Tha Bo 31.7 µg/m³, Nong Khaem 17.7 µg/m³ and Bang Bo District 15.6 µg/m³.
- 1Tha BoNong Khai31.7
- 2Nong KhaemBangkok17.7
- 3Bang Bo DistrictSamut Prakan15.6
- 4BangkokBangkok14.7
- 5Khlong LuangPathum Thani14.6
- 6Bang KapiBangkok13.8
- 7Phra PradaengSamut Prakan13.7
- 8Samut SakhonSamut Sakhon13.2
- 9Nakhon PathomNakhon Pathom12.3
- 10Mueang NonthaburiNonthaburi11.7
- 11Samut PrakanSamut Prakan11.2
Not counted on this day, too few days measured: Bang Khun Thian since 30 Apr 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.