SmogRank / World / Thailand / October 2026

Most polluted cities in Thailand, October 2026

75 cities in Thailand ranked by their average PM2.5 so far (1 of 31 days). Worst: Ban Chang at 42.9 µg/m³, #22 of 1,630 cities in the world. Cleanest: Chai Nat at 8.0. A city needs measurements on 70% of the days to be ranked.

← Ban Chang 42.9 µg/m³ 40 µg/m³0
Every city in Thailand ranked for October 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 ChangRayong
    119
  2. 2Khon KaenKhon Kaen
    80
  3. 3Khan Na YaoBangkok
    79
  4. 4Bang Pakonglow-cost sensorsChachoengsao
    78
  5. 5Bang NaBangkok
    76
  6. 6Khlong Sam WaBangkok
    75
  7. 7Lat KrabangBangkok
    73
  8. 8KalasinKalasin
    73
  9. 9Ban Talat BuengChon Buri
    72
  10. 10NarathiwatNarathiwat
    71
  11. 10Hat YaiSongkhla
    71
  12. 12Lak SiBangkok
    71
  13. 13Ban Samae DamBangkok
    71
  14. 14YalaYala
    71
  15. 15PattaniPattani
    71
  16. 16TratTrat
    70
  17. 17KanchanaburiKanchanaburi
    70
  18. 18BetongYala
    70
  19. 19Phra PradaengSamut Prakan
    70
  20. 19Khlong LuangPathum Thani
    70
  21. 19ChanthaburiChanthaburi
    70
  22. 22RayongRayong
    69
  23. 23PhuketPhuket
    68
  24. 24Roi EtRoi Et
    68
  25. 24Bang KapiBangkok
    68
  26. 26MukdahanMukdahan
    67
  27. 27Maha SarakhamMaha Sarakham
    67
  28. 28Nong ChokBangkok
    66
  29. 28Amnat CharoenAmnat Charoen
    66
  30. 30Samut SakhonSamut Sakhon
    66
  31. 30BangkokBangkok
    66
  32. 32TrangTrang
    65
  33. 32Mae SaiChiang Rai
    65
  34. 32Laem ChabangChon Buri
    65
  35. 35PhatthalungPhatthalung
    65
  36. 35Nakhon RatchasimaNakhon Ratchasima
    65
  37. 37Nong KhaemBangkok
    65
  38. 38SaraburiSaraburi
    64
  39. 38Ban Khlong PrawetBangkok
    64
  40. 40NanNan
    64
  41. 41UttaraditUttaradit
    64
  42. 41Bueng KumBangkok
    64
  43. 43Samut PrakanSamut Prakan
    63
  44. 44Ubon RatchathaniUbon Ratchathani
    63
  45. 45Sai MaiBangkok
    62
  46. 46Si Sa KetSi Sa Ket
    62
  47. 47Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    62
  48. 48Bang Bo DistrictSamut Prakan
    61
  49. 49Nakhon PathomNakhon Pathom
    61
  50. 50ChumphonChumphon
    61
  51. 51Nakhon NayokNakhon Nayok
    60
  52. 52Chiang MaiChiang Mai
    59
  53. 52Lop BuriLopburi
    59
  54. 54AranyaprathetSa Kaeo
    59
  55. 55LamphunLamphun
    57
  56. 56Mueang NonthaburiNonthaburi
    57
  57. 57PhayaoPhayao
    56
  58. 58Kamphaeng PhetKamphaeng Phet
    56
  59. 59Uthai ThaniUthai Thani
    55
  60. 60PhraePhrae
    55
  61. 60ChaiyaphumChaiyaphum
    55
  62. 62Udon ThaniUdon Thani
    55
  63. 63YasothonYasothon
    54
  64. 63Buri RamBuriram
    54
  65. 65PhichitPhichit
    54
  66. 66SukhothaiSukhothai
    54
  67. 67Chiang RaiChiang Rai
    53
  68. 67Sakon NakhonSakon Nakhon
    53
  69. 67Nong Bua LamphuNong Bua Lamphu
    53
  70. 70SurinSurin
    53
  71. 71PhetchabunPhetchabun
    51
  72. 72Hua HinPrachuap Khiri Khan
    49
  73. 73Suphan BuriSuphan Buri
    48
  74. 74Sing BuriSing Buri
    46
  75. 75Chai NatChai Nat
    44
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, October 2026 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, October 2026 (so far), smogrank.com/th/history/2026-10 (accessed 2 Oct 2026).

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