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 21 Jul 2024: Bang Na 19.7 µg/m³, Nong Khaem 15.2 µg/m³ and Saphan Sung 14.8 µg/m³.
- 1Bang NaBangkok19.7
- 2Nong KhaemBangkok15.2
- 3Saphan SungBangkok14.8
- 4Khan Na YaoBangkok14.3
- 5BangkokBangkok13.9
- 6Phra PradaengSamut Prakan12.4
- 7Hat YaiSongkhla12.3
- 8Samut SakhonSamut Sakhon12.2
- 9Bang Bo DistrictSamut Prakan11.6
- 10Bang KapiBangkok11.5
- 11Nakhon PathomNakhon Pathom10.4
- 12LamphunLamphun10.1
- 13Khlong LuangPathum Thani10.0
- 14Mueang NonthaburiNonthaburi9.9
- 15Ban Khlong PrawetBangkok9.3
- 16Tha BoNong Khai9.2
- 17Samut PrakanSamut Prakan8.8
- 18AranyaprathetSa Kaeo5.7
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 48 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.