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 Oct 2023: Samut Sakhon 24.9 µg/m³, Nong Khaem 24.1 µg/m³ and Tha Bo 21.5 µg/m³.
- 1Samut SakhonSamut Sakhon24.9
- 2Nong KhaemBangkok24.1
- 3Tha BoNong Khai21.5
- 4BangkokBangkok21.2
- 5Phra PradaengSamut Prakan20.0
- 6Bang Bo DistrictSamut Prakan19.0
- 7Nakhon PathomNakhon Pathom17.5
- 8Samut PrakanSamut Prakan17.0
- 9Mueang NonthaburiNonthaburi17.0
- 10Khlong LuangPathum Thani17.0
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.