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 µg/m³ 100 µg/m³0
Every city in Thailand ranked for April 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. 1Mae SaiChiang Rai
    147
  2. 2NanNan
    131
  3. 3PhayaoPhayao
    131
  4. 4Chiang RaiChiang Rai
    122
  5. 5LamphunLamphun
    110
  6. 6LampangLampang
    109
  7. 7PhraePhrae
    103
  8. 8Chiang MaiChiang Mai
    92
  9. 9LoeiLoei
    90
  10. 10SukhothaiSukhothai
    89
  11. 11Mae SotTak
    84
  12. 12UttaraditUttaradit
    81
  13. 12PhichitPhichit
    81
  14. 14Kamphaeng PhetKamphaeng Phet
    79
  15. 15Uthai ThaniUthai Thani
    77
  16. 16Ubon RatchathaniUbon Ratchathani
    76
  17. 17Nakhon SawanNakhon Sawan
    75
  18. 18Chai NatChai Nat
    71
  19. 19Suphan BuriSuphan Buri
    68
  20. 20Nong Bua LamphuNong Bua Lamphu
    67
  21. 21Udon ThaniUdon Thani
    66
  22. 22PhetchabunPhetchabun
    65
  23. 23Sing BuriSing Buri
    61
  24. 24Sakon NakhonSakon Nakhon
    60
  25. 25Lop BuriLopburi
    60
  26. 25KalasinKalasin
    60
  27. 27ChaiyaphumChaiyaphum
    59
  28. 28Roi EtRoi Et
    59
  29. 29Amnat CharoenAmnat Charoen
    58
  30. 30Maha SarakhamMaha Sarakham
    56
  31. 31MukdahanMukdahan
    54
  32. 32RatchaburiRatchaburi
    52
  33. 33Nakhon LuangPhra Nakhon Si Ayutthaya
    51
  34. 34YasothonYasothon
    48
  35. 35KanchanaburiKanchanaburi
    48
  36. 36Si Sa KetSi Sa Ket
    47
  37. 37Nakhon RatchasimaNakhon Ratchasima
    46
  38. 38Bang Pakonglow-cost sensorsChachoengsao
    45
  39. 39PhetchaburiPhetchaburi
    44
  40. 40Si Maha PhotPrachin Buri
    44
  41. 41Khlong LuangPathum Thani
    42
  42. 42SaraburiSaraburi
    41
  43. 42Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    41
  44. 44Bang NaBangkok
    41
  45. 45Khlong Sam WaBangkok
    40
  46. 46Khan Na YaoBangkok
    39
  47. 47Buri RamBuriram
    39
  48. 48SurinSurin
    39
  49. 49Lat KrabangBangkok
    38
  50. 50Phra PradaengSamut Prakan
    38
  51. 50Nong ChokBangkok
    38
  52. 52Nakhon NayokNakhon Nayok
    38
  53. 53Samut SakhonSamut Sakhon
    37
  54. 54Sai MaiBangkok
    37
  55. 55Saphan SungBangkok
    37
  56. 56Nakhon PathomNakhon Pathom
    36
  57. 57Bang Bo DistrictSamut Prakan
    36
  58. 58Ban Samae DamBangkok
    36
  59. 58Bang KapiBangkok
    36
  60. 60Mueang NonthaburiNonthaburi
    36
  61. 61Nong KhaemBangkok
    35
  62. 62Lak SiBangkok
    35
  63. 63BangkokBangkok
    35
  64. 64AranyaprathetSa Kaeo
    34
  65. 65Bueng KumBangkok
    33
  66. 66Ban Talat BuengChon Buri
    32
  67. 67Ban Khlong PrawetBangkok
    32
  68. 68Hua HinPrachuap Khiri Khan
    32
  69. 69Samut PrakanSamut Prakan
    31
  70. 70SadaoSongkhla
    30
  71. 70Ban ChangRayong
    30
  72. 72TratTrat
    30
  73. 72RayongRayong
    30
  74. 74Laem ChabangChon Buri
    28
  75. 75RanongRanong province
    27
  76. 76ChumphonChumphon
    27
  77. 77ChanthaburiChanthaburi
    27
  78. 78PhatthalungPhatthalung
    23
  79. 78PattaniPattani
    23
  80. 80TrangTrang
    22
  81. 81BetongYala
    21
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual 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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