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 Dec 2023: Samut Sakhon 51.8 µg/m³, Nong Khaem 37.5 µg/m³ and Nakhon Pathom 34.8 µg/m³.
- 1Samut SakhonSamut Sakhon51.8
- 2Nong KhaemBangkok37.5
- 3Nakhon PathomNakhon Pathom34.8
- 4Mueang NonthaburiNonthaburi33.7
- 5Khlong LuangPathum Thani31.0
- 6BangkokBangkok30.6
- 7Phra PradaengSamut Prakan28.7
- 8Bang Bo DistrictSamut Prakan26.0
- 9Samut PrakanSamut Prakan25.5
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.