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 18 Jul 2024: Nong Khaem 15.6 µg/m³, Saphan Sung 15.0 µg/m³ and Khan Na Yao 14.3 µg/m³.
- 1Nong KhaemBangkok15.6
- 2Saphan SungBangkok15.0
- 3Khan Na YaoBangkok14.3
- 4BangkokBangkok14.1
- 5Samut SakhonSamut Sakhon12.6
- 6Phra PradaengSamut Prakan12.6
- 7Bang Bo DistrictSamut Prakan12.1
- 8Hat YaiSongkhla11.8
- 9Bang KapiBangkok11.6
- 10Nakhon PathomNakhon Pathom10.7
- 11Tha BoNong Khai10.6
- 12Khlong LuangPathum Thani10.3
- 13Mueang NonthaburiNonthaburi10.1
- 14Samut PrakanSamut Prakan9.4
- 15Ban Khlong PrawetBangkok9.4
- 16AranyaprathetSa Kaeo6.4
Not counted on this day, too few days measured: Lampang since 16 Jul 2024, Chiang Rai since 16 Jul 2024, Chiang Mai since 16 Jul 2024 and 50 more cities.
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.