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
    10+
  2. 2NanNan
    10
  3. 3PhayaoPhayao
    10
  4. 4Chiang RaiChiang Rai
    10
  5. 5LamphunLamphun
    9
  6. 6LampangLampang
    9
  7. 7PhraePhrae
    8
  8. 8Chiang MaiChiang Mai
    7
  9. 9LoeiLoei
    7
  10. 10SukhothaiSukhothai
    7
  11. 11Mae SotTak
    7
  12. 12UttaraditUttaradit
    6
  13. 12PhichitPhichit
    6
  14. 14Kamphaeng PhetKamphaeng Phet
    6
  15. 15Uthai ThaniUthai Thani
    6
  16. 16Ubon RatchathaniUbon Ratchathani
    6
  17. 17Nakhon SawanNakhon Sawan
    6
  18. 18Chai NatChai Nat
    6
  19. 19Suphan BuriSuphan Buri
    5
  20. 20Nong Bua LamphuNong Bua Lamphu
    5
  21. 21Udon ThaniUdon Thani
    5
  22. 22PhetchabunPhetchabun
    5
  23. 23Sing BuriSing Buri
    5
  24. 24Sakon NakhonSakon Nakhon
    5
  25. 25Lop BuriLopburi
    5
  26. 25KalasinKalasin
    5
  27. 27ChaiyaphumChaiyaphum
    5
  28. 28Roi EtRoi Et
    5
  29. 29Amnat CharoenAmnat Charoen
    5
  30. 30Maha SarakhamMaha Sarakham
    4
  31. 31MukdahanMukdahan
    4
  32. 32RatchaburiRatchaburi
    4
  33. 33Nakhon LuangPhra Nakhon Si Ayutthaya
    4
  34. 34YasothonYasothon
    4
  35. 35KanchanaburiKanchanaburi
    4
  36. 36Si Sa KetSi Sa Ket
    4
  37. 37Nakhon RatchasimaNakhon Ratchasima
    4
  38. 38Bang Pakonglow-cost sensorsChachoengsao
    4
  39. 39PhetchaburiPhetchaburi
    4
  40. 40Si Maha PhotPrachin Buri
    4
  41. 41Khlong LuangPathum Thani
    3
  42. 42SaraburiSaraburi
    3
  43. 42Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    3
  44. 44Bang NaBangkok
    3
  45. 45Khlong Sam WaBangkok
    3
  46. 46Khan Na YaoBangkok
    3
  47. 47Buri RamBuriram
    3
  48. 48SurinSurin
    3
  49. 49Lat KrabangBangkok
    3
  50. 50Phra PradaengSamut Prakan
    3
  51. 50Nong ChokBangkok
    3
  52. 52Nakhon NayokNakhon Nayok
    3
  53. 53Samut SakhonSamut Sakhon
    3
  54. 54Sai MaiBangkok
    3
  55. 55Saphan SungBangkok
    3
  56. 56Nakhon PathomNakhon Pathom
    3
  57. 57Bang Bo DistrictSamut Prakan
    3
  58. 58Ban Samae DamBangkok
    3
  59. 58Bang KapiBangkok
    3
  60. 60Mueang NonthaburiNonthaburi
    3
  61. 61Nong KhaemBangkok
    3
  62. 62Lak SiBangkok
    3
  63. 63BangkokBangkok
    3
  64. 64AranyaprathetSa Kaeo
    3
  65. 65Bueng KumBangkok
    3
  66. 66Ban Talat BuengChon Buri
    3
  67. 67Ban Khlong PrawetBangkok
    3
  68. 68Hua HinPrachuap Khiri Khan
    3
  69. 69Samut PrakanSamut Prakan
    3
  70. 70SadaoSongkhla
    3
  71. 70Ban ChangRayong
    3
  72. 72TratTrat
    3
  73. 72RayongRayong
    3
  74. 74Laem ChabangChon Buri
    2
  75. 75RanongRanong province
    2
  76. 76ChumphonChumphon
    2
  77. 77ChanthaburiChanthaburi
    2
  78. 78PhatthalungPhatthalung
    2
  79. 78PattaniPattani
    2
  80. 80TrangTrang
    2
  81. 81BetongYala
    2
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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.