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 19 Feb 2024: Lampang 61.7 µg/m³, Sukhothai 59.6 µg/m³ and Ban Thai Tan 55.1 µg/m³.
- 1LampangLampang61.7
- 2SukhothaiSukhothai59.6
- 3Ban Thai TanAng Thong55.1
- 4RatchaburiRatchaburi51.9
- 5PhraePhrae47.9
- 6PhayaoPhayao46.4
- 7Khlong Sam WaBangkok46.2
- 8Nong KhaemBangkok45.9
- 9Ban Samae DamBangkok45.9
- 10Lop BuriLopburi45.6
- 11Lat KrabangBangkok45.3
- 12Samut SakhonSamut Sakhon45.2
- 13Chai NatChai Nat45.1
- 14Sing BuriSing Buri45.0
- 15Nakhon SawanNakhon Sawan44.9
- 16Ubon RatchathaniUbon Ratchathani44.8
- 17Bang NaBangkok44.3
- 18AranyaprathetSa Kaeo44.3
- 19Khlong LuangPathum Thani43.6
- 20PhetchabunPhetchabun43.1
+ 54 more cities, 42.8 µg/m³ and below
Not counted on this day, too few days measured: Kanchanaburi since 16 Feb 2024, Si Maha Phot since 11 Feb 2024, Surin since 10 Feb 2024 and Nakhon Ratchasima since 8 Feb 2024. 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.