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 22 Feb 2024: Lampang 62.0 µg/m³, Sukhothai 59.3 µg/m³ and Kanchanaburi 51.6 µg/m³.
- 1LampangLampang62.0
- 2SukhothaiSukhothai59.3
- 3KanchanaburiKanchanaburi51.6
- 4Ban Thai TanAng Thong50.1
- 5RatchaburiRatchaburi48.8
- 6Ubon RatchathaniUbon Ratchathani47.9
- 7PhraePhrae47.0
- 8PhayaoPhayao46.2
- 9MukdahanMukdahan45.2
- 10NanNan44.2
- 11Ban Samae DamBangkok43.1
- 12Lop BuriLopburi42.8
- 13KalasinKalasin42.6
- 14YasothonYasothon42.5
- 15Chai NatChai Nat42.5
- 16Nong KhaemBangkok42.3
- 17Nakhon SawanNakhon Sawan42.1
- 18Sing BuriSing Buri41.9
- 19Lat KrabangBangkok41.9
- 20Samut SakhonSamut Sakhon41.7
+ 54 more cities, 41.6 µg/m³ and below
Not counted on this day, too few days measured: Lak Si since 22 Feb 2024, Khlong Sam Wa since 21 Feb 2024, Si Maha Phot since 11 Feb 2024 and 2 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
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.