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 20 Jan 2024: Samut Sakhon 52.6 µg/m³, Nong Khaem 44.4 µg/m³ and Mueang Nonthaburi 44.2 µg/m³.
- 1Samut SakhonSamut Sakhon52.6
- 2Nong KhaemBangkok44.4
- 3Mueang NonthaburiNonthaburi44.2
- 4Khlong LuangPathum Thani43.1
- 5Nakhon PathomNakhon Pathom42.4
- 6BangkokBangkok38.2
- 7Phra PradaengSamut Prakan35.0
- 8Bang Bo DistrictSamut Prakan34.1
- 9Samut PrakanSamut Prakan32.1
Not counted on this day, too few days measured: Tha Bo since 28 Nov 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.