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
    191
  2. 2NanNan
    182
  3. 3PhayaoPhayao
    182
  4. 4Chiang RaiChiang Rai
    177
  5. 5LamphunLamphun
    170
  6. 6LampangLampang
    170
  7. 7PhraePhrae
    166
  8. 8Chiang MaiChiang Mai
    160
  9. 9LoeiLoei
    159
  10. 10SukhothaiSukhothai
    158
  11. 11Mae SotTak
    155
  12. 12UttaraditUttaradit
    154
  13. 12PhichitPhichit
    154
  14. 14Kamphaeng PhetKamphaeng Phet
    153
  15. 15Uthai ThaniUthai Thani
    152
  16. 16Ubon RatchathaniUbon Ratchathani
    150
  17. 17Nakhon SawanNakhon Sawan
    149
  18. 18Chai NatChai Nat
    141
  19. 19Suphan BuriSuphan Buri
    134
  20. 20Nong Bua LamphuNong Bua Lamphu
    132
  21. 21Udon ThaniUdon Thani
    131
  22. 22PhetchabunPhetchabun
    128
  23. 23Sing BuriSing Buri
    121
  24. 24Sakon NakhonSakon Nakhon
    119
  25. 25Lop BuriLopburi
    118
  26. 25KalasinKalasin
    118
  27. 27ChaiyaphumChaiyaphum
    117
  28. 28Roi EtRoi Et
    116
  29. 29Amnat CharoenAmnat Charoen
    114
  30. 30Maha SarakhamMaha Sarakham
    110
  31. 31MukdahanMukdahan
    107
  32. 32RatchaburiRatchaburi
    102
  33. 33Nakhon LuangPhra Nakhon Si Ayutthaya
    101
  34. 34YasothonYasothon
    96
  35. 35KanchanaburiKanchanaburi
    96
  36. 36Si Sa KetSi Sa Ket
    95
  37. 37Nakhon RatchasimaNakhon Ratchasima
    94
  38. 38Bang Pakonglow-cost sensorsChachoengsao
    92
  39. 39PhetchaburiPhetchaburi
    91
  40. 40Si Maha PhotPrachin Buri
    90
  41. 41Khlong LuangPathum Thani
    88
  42. 42SaraburiSaraburi
    87
  43. 42Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    87
  44. 44Bang NaBangkok
    87
  45. 45Khlong Sam WaBangkok
    86
  46. 46Khan Na YaoBangkok
    85
  47. 47Buri RamBuriram
    85
  48. 48SurinSurin
    84
  49. 49Lat KrabangBangkok
    84
  50. 50Phra PradaengSamut Prakan
    83
  51. 50Nong ChokBangkok
    83
  52. 52Nakhon NayokNakhon Nayok
    83
  53. 53Samut SakhonSamut Sakhon
    82
  54. 54Sai MaiBangkok
    82
  55. 55Saphan SungBangkok
    82
  56. 56Nakhon PathomNakhon Pathom
    81
  57. 57Bang Bo DistrictSamut Prakan
    81
  58. 58Ban Samae DamBangkok
    80
  59. 58Bang KapiBangkok
    80
  60. 60Mueang NonthaburiNonthaburi
    80
  61. 61Nong KhaemBangkok
    79
  62. 62Lak SiBangkok
    79
  63. 63BangkokBangkok
    79
  64. 64AranyaprathetSa Kaeo
    78
  65. 65Bueng KumBangkok
    77
  66. 66Ban Talat BuengChon Buri
    75
  67. 67Ban Khlong PrawetBangkok
    75
  68. 68Hua HinPrachuap Khiri Khan
    75
  69. 69Samut PrakanSamut Prakan
    74
  70. 70SadaoSongkhla
    72
  71. 70Ban ChangRayong
    72
  72. 72TratTrat
    72
  73. 72RayongRayong
    72
  74. 74Laem ChabangChon Buri
    71
  75. 75RanongRanong province
    69
  76. 76ChumphonChumphon
    69
  77. 77ChanthaburiChanthaburi
    68
  78. 78PhatthalungPhatthalung
    64
  79. 78PattaniPattani
    64
  80. 80TrangTrang
    63
  81. 81BetongYala
    61
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, April 2026 · Thailand now

Use this board

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

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.