SmogRank / World / South Korea / September 2025

Most polluted cities in South Korea, September 2025

135 cities in South Korea ranked by their average PM2.5 over the 30 days. Worst: Haenam at 20.4 µg/m³, #196 of 2,711 cities in the world. Cleanest: Cheongsong gun at 3.8. A city needs measurements on 70% of the days to be ranked.

← Haenam 20.4 µg/m³ 20 µg/m³0
Every city in South Korea ranked for September 2025, 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. 1HaenamJeollanam-do
    72
  2. 2HwadoGyeonggi-do
    62
  3. 3SeonghwanChungcheongnam-do
    58
  4. 4PyeongtaekGyeonggi-do
    57
  5. 5Ganghwa-gunIncheon
    56
  6. 6IncheonIncheon
    55
  7. 7MokpoJeollanam-do
    55
  8. 8Hwaseong-siGyeonggi-do
    55
  9. 8Donghae CityGangwon-do
    55
  10. 10Gimpo-siGyeonggi-do
    55
  11. 11KimjeJeollabuk-do
    54
  12. 11Icheon-siGyeonggi-do
    54
  13. 13SantyokuGangwon-do
    54
  14. 13GumiGyeongsangbuk-do
    54
  15. 15CheonanChungcheongnam-do
    54
  16. 16HongseongChungcheongnam-do
    53
  17. 16HayangGyeongsangbuk-do
    53
  18. 18Ansan-siGyeonggi-do
    53
  19. 19YesanChungcheongnam-do
    53
  20. 20AsanChungcheongnam-do
    53
  21. 20GwangmyeongGyeonggi-do
    53
  22. 22UlsanUlsan
    53
  23. 22OsanGyeonggi-do
    53
  24. 24TangjinChungcheongnam-do
    52
  25. 24Taesal-liChungcheongnam-do
    52
  26. 26GoseongGyeongsangnam-do
    52
  27. 26KoesanNorth Chungcheong
    52
  28. 26HwawŏnDaegu
    52
  29. 29YeonggwangJeollanam-do
    52
  30. 29WanjuJeollabuk-do
    52
  31. 29SuwonGyeonggi-do
    52
  32. 29TongyeongGyeongsangnam-do
    52
  33. 29Cheongju-siNorth Chungcheong
    52
  34. 29SinhyeonGyeongsangnam-do
    52
  35. 35JungpyongNorth Chungcheong
    52
  36. 36NangenJeollabuk-do
    51
  37. 36ChangnyeongGyeongsangnam-do
    51
  38. 38PohangGyeongsangbuk-do
    51
  39. 38JeongeupJeollabuk-do
    51
  40. 40YangsanGyeongsangnam-do
    51
  41. 40Bucheon-siGyeonggi-do
    51
  42. 40Goyang-siGyeonggi-do
    51
  43. 40CheorwonGangwon-do
    51
  44. 40ChangwonGyeongsangnam-do
    51
  45. 45WŏnjuGangwon-do
    50
  46. 45PubalGyeonggi-do
    50
  47. 47BuanJeollabuk-do
    49
  48. 48Uijeongbu-siGyeonggi-do
    49
  49. 48BoryeongChungcheongnam-do
    49
  50. 48BuyeoChungcheongnam-do
    49
  51. 48UngsangGyeongsangnam-do
    49
  52. 52SeoulSeoul
    48
  53. 52NaesŏGyeongsangnam-do
    48
  54. 54SeosanChungcheongnam-do
    48
  55. 55EisenGyeongsangbuk-do
    47
  56. 55GunsanJeollabuk-do
    47
  57. 55IksanJeollabuk-do
    47
  58. 55Anyang-siGyeonggi-do
    47
  59. 55YŏnmuChungcheongnam-do
    47
  60. 55SejongSejong-si
    47
  61. 61BusanBusan
    47
  62. 61Guri-siGyeonggi-do
    47
  63. 61GimcheonGyeongsangbuk-do
    47
  64. 64NonsanChungcheongnam-do
    46
  65. 64Gyeongsan-siGyeongsangbuk-do
    46
  66. 64ChungjuNorth Chungcheong
    46
  67. 64ChinjuGyeongsangnam-do
    46
  68. 68MasanGwangju
    46
  69. 68GeojeGyeongsangnam-do
    46
  70. 70YeongdongNorth Chungcheong
    45
  71. 70DaeguDaegu
    45
  72. 70HanamGyeonggi-do
    45
  73. 73MunsanGyeonggi-do
    44
  74. 73YeosuJeollanam-do
    44
  75. 75NamsaJeollabuk-do
    44
  76. 75MiryangGyeongsangnam-do
    44
  77. 75GijangBusan
    44
  78. 78Jeju CityJeju-do
    43
  79. 79YeonilGyeongsangbuk-do
    43
  80. 79WaegwanGyeongsangbuk-do
    43
  81. 79GongjuChungcheongnam-do
    43
  82. 79KimhaeGyeongsangnam-do
    43
  83. 83GwangjuGyeonggi-do
    42
  84. 83BoseongJeollanam-do
    42
  85. 85YecheonGyeongsangbuk-do
    42
  86. 85NajuJeollanam-do
    42
  87. 85KwangyangJeollanam-do
    42
  88. 85GwangyangJeollanam-do
    42
  89. 89ImsilJeollabuk-do
    41
  90. 89JeonjuJeollabuk-do
    41
  91. 89NamyangjuGyeonggi-do
    41
  92. 92BeolgyoJeollanam-do
    41
  93. 92MuanJeollanam-do
    41
  94. 92Chinch'ŏnNorth Chungcheong
    41
  95. 92Seongnam-siGyeonggi-do
    41
  96. 92SinanJeollanam-do
    41
  97. 92HadongGyeongsangnam-do
    41
  98. 98DaejeonDaejeon
    40
  99. 98GwangjuGwangju
    40
  100. 98HwasunJeollanam-do
    40
  101. 101YeongjuGyeongsangbuk-do
    39
  102. 101SuncheonJeollanam-do
    39
  103. 101JangseongJeollanam-do
    39
  104. 101JangheungJeollanam-do
    39
  105. 101GaigeturiJeju-do
    39
  106. 106DamyangJeollanam-do
    39
  107. 107KinzanChungcheongnam-do
    38
  108. 108NeietsuGangwon-do
    38
  109. 108AnseongGyeonggi-do
    38
  110. 110YeojuGyeonggi-do
    37
  111. 110Yangp'yŏngGyeonggi-do
    37
  112. 112SangjuGyeongsangbuk-do
    36
  113. 112SeogwipoJeju-do
    36
  114. 114ChangsuJeollabuk-do
    34
  115. 115GangneungGangwon-do
    33
  116. 116OkcheonNorth Chungcheong
    33
  117. 117GyeongjuGyeongsangbuk-do
    32
  118. 118YangjuGyeonggi-do
    31
  119. 118T’aebaekGangwon-do
    31
  120. 118AndongGyeongsangbuk-do
    31
  121. 121HwacheonGangwon-do
    30
  122. 122Koch'angJeollabuk-do
    29
  123. 123MungyeongGyeongsangbuk-do
    28
  124. 123JumunjinGangwon-do
    28
  125. 125ChuncheonGangwon-do
    28
  126. 126Jinan-gunJeollabuk-do
    27
  127. 127SokchoGangwon-do
    26
  128. 128GapyeongGyeonggi-do
    26
  129. 129YangguGangwon-do
    25
  130. 129YeongamJeollanam-do
    25
  131. 131KosongGangwon-do
    24
  132. 131KunwiGyeongsangbuk-do
    24
  133. 131Hongch’ŏnGangwon-do
    24
  134. 134WabuGyeonggi-do
    22
  135. 135Cheongsong gunGyeongsangbuk-do
    21
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, September 2025 · South Korea now

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SmogRank, most polluted cities in South Korea, PM2.5, September 2025, smogrank.com/kr/history/2025-09 (accessed 2 Oct 2026).

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