SmogRank / World / Thailand / April 2026

Most polluted cities in Thailand, April 2026

81 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Mae Sai at 112.6 µg/m³, #2 of 2,573 cities in the world. Cleanest: Betong at 14.4. A city needs measurements on 70% of the days to be ranked.

← Mae Sai 112.6
Every city in Thailand ranked for April 2026, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Mae SaiChiang Rai
    276
  2. 2NanNan
    228
  3. 3PhayaoPhayao
    228
  4. 4Chiang RaiChiang Rai
    204
  5. 5LamphunLamphun
    173
  6. 6LampangLampang
    173
  7. 7PhraePhrae
    156
  8. 8Chiang MaiChiang Mai
    125
  9. 9LoeiLoei
    121
  10. 10SukhothaiSukhothai
    118
  11. 11Mae SotTak
    104
  12. 12UttaraditUttaradit
    100
  13. 12PhichitPhichit
    100
  14. 14Kamphaeng PhetKamphaeng Phet
    97
  15. 15Uthai ThaniUthai Thani
    95
  16. 16Ubon RatchathaniUbon Ratchathani
    92
  17. 17Nakhon SawanNakhon Sawan
    92
  18. 18Chai NatChai Nat
    86
  19. 19Suphan BuriSuphan Buri
    81
  20. 20Nong Bua LamphuNong Bua Lamphu
    80
  21. 21Udon ThaniUdon Thani
    80
  22. 22PhetchabunPhetchabun
    78
  23. 23Sing BuriSing Buri
    73
  24. 24Sakon NakhonSakon Nakhon
    71
  25. 25Lop BuriLopburi
    71
  26. 25KalasinKalasin
    71
  27. 27ChaiyaphumChaiyaphum
    70
  28. 28Roi EtRoi Et
    70
  29. 29Amnat CharoenAmnat Charoen
    68
  30. 30Maha SarakhamMaha Sarakham
    65
  31. 31MukdahanMukdahan
    63
  32. 32RatchaburiRatchaburi
    59
  33. 33Nakhon LuangPhra Nakhon Si Ayutthaya
    59
  34. 34YasothonYasothon
    56
  35. 35KanchanaburiKanchanaburi
    54
  36. 36Si Sa KetSi Sa Ket
    54
  37. 37Nakhon RatchasimaNakhon Ratchasima
    53
  38. 38Bang Pakonglow-cost sensorsChachoengsao
    51
  39. 39PhetchaburiPhetchaburi
    51
  40. 40Si Maha PhotPrachin Buri
    50
  41. 41Khlong LuangPathum Thani
    48
  42. 42SaraburiSaraburi
    48
  43. 42Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    48
  44. 44Bang NaBangkok
    47
  45. 45Khlong Sam WaBangkok
    47
  46. 46Khan Na YaoBangkok
    45
  47. 47Buri RamBuriram
    45
  48. 48SurinSurin
    45
  49. 49Lat KrabangBangkok
    45
  50. 50Phra PradaengSamut Prakan
    43
  51. 50Nong ChokBangkok
    43
  52. 52Nakhon NayokNakhon Nayok
    43
  53. 53Samut SakhonSamut Sakhon
    43
  54. 54Sai MaiBangkok
    43
  55. 55Saphan SungBangkok
    43
  56. 56Nakhon PathomNakhon Pathom
    42
  57. 57Bang Bo DistrictSamut Prakan
    42
  58. 58Ban Samae DamBangkok
    42
  59. 58Bang KapiBangkok
    42
  60. 60Mueang NonthaburiNonthaburi
    42
  61. 61Nong KhaemBangkok
    40
  62. 62Lak SiBangkok
    40
  63. 63BangkokBangkok
    40
  64. 64AranyaprathetSa Kaeo
    40
  65. 65Bueng KumBangkok
    38
  66. 66Ban Talat BuengChon Buri
    37
  67. 67Ban Khlong PrawetBangkok
    37
  68. 68Hua HinPrachuap Khiri Khan
    37
  69. 69Samut PrakanSamut Prakan
    35
  70. 70SadaoSongkhla
    35
  71. 70Ban ChangRayong
    35
  72. 72TratTrat
    35
  73. 72RayongRayong
    35
  74. 74Laem ChabangChon Buri
    33
  75. 75RanongRanong province
    32
  76. 76ChumphonChumphon
    32
  77. 77ChanthaburiChanthaburi
    30
  78. 78PhatthalungPhatthalung
    27
  79. 78PattaniPattani
    27
  80. 80TrangTrang
    25
  81. 81BetongYala
    23
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Thailand, PM2.5, April 2026, smogrank.com/th/history/2026-04 (accessed 2 Oct 2026).

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