SmogRank / World / South Korea / May 2025

Most polluted cities in South Korea, May 2025

135 cities in South Korea ranked by their average PM2.5 over the 31 days. Worst: Seonghwan at 21.4 µg/m³, #231 of 2,451 cities in the world. Cleanest: Kosong at 9.8. A city needs measurements on 70% of the days to be ranked.

← Seonghwan 21.4 µg/m³ 20 µg/m³0
Every city in South Korea ranked for May 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. 1SeonghwanChungcheongnam-do
    74
  2. 2TangjinChungcheongnam-do
    74
  3. 3GumiGyeongsangbuk-do
    73
  4. 4AsanChungcheongnam-do
    72
  5. 4Gimpo-siGyeonggi-do
    72
  6. 4Ansan-siGyeonggi-do
    72
  7. 7Goyang-siGyeonggi-do
    71
  8. 8IncheonIncheon
    71
  9. 9SeoulSeoul
    71
  10. 10IksanJeollabuk-do
    71
  11. 11Bucheon-siGyeonggi-do
    71
  12. 12Hwaseong-siGyeonggi-do
    70
  13. 12PubalGyeonggi-do
    70
  14. 14YeojuGyeonggi-do
    70
  15. 15OsanGyeonggi-do
    70
  16. 15Guri-siGyeonggi-do
    70
  17. 17WŏnjuGangwon-do
    69
  18. 18SuwonGyeonggi-do
    69
  19. 18Ganghwa-gunIncheon
    69
  20. 20Icheon-siGyeonggi-do
    69
  21. 21NajuJeollanam-do
    69
  22. 22YesanChungcheongnam-do
    68
  23. 22GwangmyeongGyeonggi-do
    68
  24. 24WaegwanGyeongsangbuk-do
    68
  25. 25Anyang-siGyeonggi-do
    68
  26. 26GunsanJeollabuk-do
    68
  27. 26JungpyongNorth Chungcheong
    68
  28. 28PyeongtaekGyeonggi-do
    68
  29. 28KinzanChungcheongnam-do
    68
  30. 30CheonanChungcheongnam-do
    67
  31. 31Uijeongbu-siGyeonggi-do
    67
  32. 32HongseongChungcheongnam-do
    67
  33. 32YŏnmuChungcheongnam-do
    67
  34. 34YeongjuGyeongsangbuk-do
    67
  35. 34SantyokuGangwon-do
    67
  36. 36SejongSejong-si
    66
  37. 37JeongeupJeollabuk-do
    66
  38. 38SangjuGyeongsangbuk-do
    66
  39. 39PohangGyeongsangbuk-do
    66
  40. 39NonsanChungcheongnam-do
    66
  41. 41NangenJeollabuk-do
    65
  42. 41CheorwonGangwon-do
    65
  43. 43MiryangGyeongsangnam-do
    65
  44. 43HanamGyeonggi-do
    65
  45. 45OkcheonNorth Chungcheong
    65
  46. 45NamsaJeollabuk-do
    65
  47. 45MunsanGyeonggi-do
    65
  48. 45GwangjuGyeonggi-do
    65
  49. 49HayangGyeongsangbuk-do
    65
  50. 50Yangp'yŏngGyeonggi-do
    64
  51. 51WanjuJeollabuk-do
    64
  52. 51TongyeongGyeongsangnam-do
    64
  53. 53Cheongju-siNorth Chungcheong
    64
  54. 53YeongamJeollanam-do
    64
  55. 55Chinch'ŏnNorth Chungcheong
    64
  56. 56UlsanUlsan
    64
  57. 56DaeguDaegu
    64
  58. 56BuanJeollabuk-do
    64
  59. 56GoseongGyeongsangnam-do
    64
  60. 56NamyangjuGyeonggi-do
    64
  61. 61MasanGwangju
    63
  62. 62YecheonGyeongsangbuk-do
    63
  63. 62SeosanChungcheongnam-do
    63
  64. 62AnseongGyeonggi-do
    63
  65. 65DaejeonDaejeon
    63
  66. 65HaenamJeollanam-do
    63
  67. 67ChinjuGyeongsangnam-do
    63
  68. 67WabuGyeonggi-do
    63
  69. 67HwawŏnDaegu
    63
  70. 70YeongdongNorth Chungcheong
    63
  71. 70BoryeongChungcheongnam-do
    63
  72. 70MungyeongGyeongsangbuk-do
    63
  73. 70Donghae CityGangwon-do
    63
  74. 70Seongnam-siGyeonggi-do
    63
  75. 75ChungjuNorth Chungcheong
    62
  76. 75NaesŏGyeongsangnam-do
    62
  77. 77Jeju CityJeju-do
    62
  78. 78KoesanNorth Chungcheong
    62
  79. 79KwangyangJeollanam-do
    62
  80. 80YangjuGyeonggi-do
    62
  81. 80BuyeoChungcheongnam-do
    62
  82. 80Hongch’ŏnGangwon-do
    62
  83. 80ChangsuJeollabuk-do
    62
  84. 84Gyeongsan-siGyeongsangbuk-do
    61
  85. 84GapyeongGyeonggi-do
    61
  86. 86YeonilGyeongsangbuk-do
    61
  87. 86BusanBusan
    61
  88. 86GwangyangJeollanam-do
    61
  89. 89KimjeJeollabuk-do
    61
  90. 90ImsilJeollabuk-do
    61
  91. 91DamyangJeollanam-do
    61
  92. 91GangneungGangwon-do
    61
  93. 91ChangwonGyeongsangnam-do
    61
  94. 91HadongGyeongsangnam-do
    61
  95. 95GongjuChungcheongnam-do
    61
  96. 95GimcheonGyeongsangbuk-do
    61
  97. 97GwangjuGwangju
    60
  98. 97JumunjinGangwon-do
    60
  99. 99ChangnyeongGyeongsangnam-do
    60
  100. 99BoseongJeollanam-do
    60
  101. 101YangsanGyeongsangnam-do
    60
  102. 101SokchoGangwon-do
    60
  103. 103SinhyeonGyeongsangnam-do
    60
  104. 104MokpoJeollanam-do
    59
  105. 104Cheongsong gunGyeongsangbuk-do
    59
  106. 104JangseongJeollanam-do
    59
  107. 104HwadoGyeonggi-do
    59
  108. 108GijangBusan
    59
  109. 108GaigeturiJeju-do
    59
  110. 108SeogwipoJeju-do
    59
  111. 111YeonggwangJeollanam-do
    59
  112. 111HwasunJeollanam-do
    59
  113. 111JeonjuJeollabuk-do
    59
  114. 111JangheungJeollanam-do
    59
  115. 111GeojeGyeongsangnam-do
    59
  116. 116YangguGangwon-do
    59
  117. 116KimhaeGyeongsangnam-do
    59
  118. 116YeosuJeollanam-do
    59
  119. 119SuncheonJeollanam-do
    58
  120. 119GyeongjuGyeongsangbuk-do
    58
  121. 119KunwiGyeongsangbuk-do
    58
  122. 122MuanJeollanam-do
    58
  123. 123NeietsuGangwon-do
    58
  124. 123AndongGyeongsangbuk-do
    58
  125. 125KuryeJeollanam-do
    58
  126. 125Jinan-gunJeollabuk-do
    58
  127. 127EisenGyeongsangbuk-do
    57
  128. 127BeolgyoJeollanam-do
    57
  129. 127ChuncheonGangwon-do
    57
  130. 130Koch'angJeollabuk-do
    57
  131. 131Taesal-liChungcheongnam-do
    57
  132. 132SinanJeollanam-do
    56
  133. 133UngsangGyeongsangnam-do
    56
  134. 134HwacheonGangwon-do
    55
  135. 135KosongGangwon-do
    52
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

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SmogRank, most polluted cities in South Korea, PM2.5, May 2025, smogrank.com/kr/history/2025-05 (accessed 2 Oct 2026).

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