SmogRank / World / Thailand / May 2026

Most polluted cities in Thailand, May 2026

75 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Ban Talat Bueng at 26.7 µg/m³, #315 of 2,522 cities in the world. Cleanest: Betong at 7.1. A city needs measurements on 70% of the days to be ranked.

← Ban Talat Bueng 26.7 µg/m³ 20 µg/m³0
Every city in Thailand ranked for May 2026, 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. 1Ban Talat BuengChon Buri
    84
  2. 2Ubon RatchathaniUbon Ratchathani
    81
  3. 3Khon KaenKhon Kaen
    77
  4. 4KanchanaburiKanchanaburi
    75
  5. 5Mae SaiChiang Rai
    75
  6. 6Roi EtRoi Et
    73
  7. 7KalasinKalasin
    72
  8. 8Si Maha PhotPrachin Buri
    72
  9. 8MukdahanMukdahan
    72
  10. 10Amnat CharoenAmnat Charoen
    72
  11. 11Khan Na YaoBangkok
    71
  12. 12Khlong LuangPathum Thani
    71
  13. 13Maha SarakhamMaha Sarakham
    71
  14. 14PhayaoPhayao
    70
  15. 14Bang NaBangkok
    70
  16. 16LamphunLamphun
    69
  17. 17Khlong Sam WaBangkok
    69
  18. 18UttaraditUttaradit
    69
  19. 19Suphan BuriSuphan Buri
    69
  20. 19Lak SiBangkok
    69
  21. 21Uthai ThaniUthai Thani
    69
  22. 22SukhothaiSukhothai
    68
  23. 22Lat KrabangBangkok
    68
  24. 24Nakhon RatchasimaNakhon Ratchasima
    68
  25. 25Phra PradaengSamut Prakan
    68
  26. 26RatchaburiRatchaburi
    67
  27. 27Samut SakhonSamut Sakhon
    67
  28. 28YasothonYasothon
    67
  29. 29Saphan SungBangkok
    67
  30. 30Bueng KumBangkok
    66
  31. 31SaraburiSaraburi
    66
  32. 31PhraePhrae
    66
  33. 33Si Sa KetSi Sa Ket
    66
  34. 33Chai NatChai Nat
    66
  35. 35RayongRayong
    65
  36. 36Ban Samae DamBangkok
    64
  37. 37Nong KhaemBangkok
    64
  38. 38Sai MaiBangkok
    63
  39. 39Ban ChangRayong
    62
  40. 39Bang Bo DistrictSamut Prakan
    62
  41. 41Bang KapiBangkok
    62
  42. 42Nong ChokBangkok
    62
  43. 43Udon ThaniUdon Thani
    61
  44. 43BangkokBangkok
    61
  45. 43Laem ChabangChon Buri
    61
  46. 46Chiang MaiChiang Mai
    61
  47. 47Nakhon PathomNakhon Pathom
    61
  48. 47Lop BuriLopburi
    61
  49. 49Sing BuriSing Buri
    61
  50. 50ChaiyaphumChaiyaphum
    60
  51. 51Sakon NakhonSakon Nakhon
    60
  52. 51PhichitPhichit
    60
  53. 53Chiang RaiChiang Rai
    59
  54. 53Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    59
  55. 55LoeiLoei
    59
  56. 55Buri RamBuriram
    59
  57. 57TratTrat
    59
  58. 58Ban Khlong PrawetBangkok
    58
  59. 59Kamphaeng PhetKamphaeng Phet
    58
  60. 60SurinSurin
    58
  61. 60AranyaprathetSa Kaeo
    58
  62. 62Bang Pakonglow-cost sensorsChachoengsao
    57
  63. 63Samut PrakanSamut Prakan
    57
  64. 64Mueang NonthaburiNonthaburi
    57
  65. 64Nakhon NayokNakhon Nayok
    57
  66. 66PhetchaburiPhetchaburi
    56
  67. 66PhetchabunPhetchabun
    56
  68. 68Nong Bua LamphuNong Bua Lamphu
    56
  69. 68ChanthaburiChanthaburi
    56
  70. 70Hua HinPrachuap Khiri Khan
    52
  71. 71PhatthalungPhatthalung
    43
  72. 72PattaniPattani
    43
  73. 73ChumphonChumphon
    42
  74. 74TrangTrang
    41
  75. 75BetongYala
    39
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, May 2026 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, May 2026, smogrank.com/th/history/2026-05 (accessed 2 Oct 2026).

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