SmogRank / World / Thailand / January 2023

Most polluted cities in Thailand, January 2023

52 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Ratchaburi at 47.0 µg/m³, #25 of 1,083 cities in the world. Cleanest: Hat Yai at 16.6. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

← Ratchaburi 47.0 µg/m³ 40 µg/m³0
Every city in Thailand ranked for January 2023, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1RatchaburiRatchaburi
    129
  2. 2LampangLampang
    122
  3. 3NanNan
    119
  4. 4Nong KhaemBangkok
    114
  5. 5Mae SotTak
    114
  6. 6Bang Khun ThianBangkok
    109
  7. 7Samut SakhonSamut Sakhon
    106
  8. 8Bang NaBangkok
    105
  9. 9Bueng KumBangkok
    103
  10. 10Ban Samae DamBangkok
    102
  11. 11UttaraditUttaradit
    102
  12. 12Saphan SungBangkok
    102
  13. 13Khan Na YaoBangkok
    102
  14. 14Lak SiBangkok
    101
  15. 15Hua HinPrachuap Khiri Khan
    100
  16. 15Nakhon PathomNakhon Pathom
    100
  17. 17Lat KrabangBangkok
    100
  18. 18Chiang RaiChiang Rai
    99
  19. 19Mae SaiChiang Rai
    98
  20. 20Nakhon SawanNakhon Sawan
    97
  21. 20Bang KapiBangkok
    97
  22. 22Chiang MaiChiang Mai
    96
  23. 22Suphan BuriSuphan Buri
    96
  24. 22Mueang NonthaburiNonthaburi
    96
  25. 22Khlong LuangPathum Thani
    96
  26. 26BangkokBangkok
    96
  27. 27Sai MaiBangkok
    95
  28. 28Nong ChokBangkok
    93
  29. 29PhetchabunPhetchabun
    92
  30. 30Ban Khlong PrawetBangkok
    91
  31. 31Nakhon RatchasimaNakhon Ratchasima
    90
  32. 32LoeiLoei
    89
  33. 33SaraburiSaraburi
    88
  34. 34Nong Bua LamphuNong Bua Lamphu
    86
  35. 35Si Maha PhotPrachin Buri
    86
  36. 35Lop BuriLopburi
    86
  37. 37AranyaprathetSa Kaeo
    84
  38. 38RayongRayong
    84
  39. 39Phra PradaengSamut Prakan
    82
  40. 40ChaiyaphumChaiyaphum
    79
  41. 41MukdahanMukdahan
    78
  42. 42Buri RamBuriram
    78
  43. 43Udon ThaniUdon Thani
    77
  44. 44Ubon RatchathaniUbon Ratchathani
    75
  45. 45Sakon NakhonSakon Nakhon
    75
  46. 46TratTrat
    74
  47. 47KanchanaburiKanchanaburi
    72
  48. 47KalasinKalasin
    72
  49. 49Roi EtRoi Et
    71
  50. 49ChanthaburiChanthaburi
    71
  51. 51Si Sa KetSi Sa Ket
    68
  52. 52Hat YaiSongkhla
    65
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, January 2023 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, January 2023, smogrank.com/th/history/2023-01 (accessed 2 Oct 2026).

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