SmogRank / History / May 28, 2025

Most polluted cities on May 28, 2025

2,500 cities ranked by their average PM2.5 over the day; the worst was Puerto Varas, Chile, at 219.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 28, 2025. All episodes.

← Puerto Varas 219.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for May 28, 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. 1Puerto VarasLos Lagos Region, Chile
    29414.6×
  2. 2OsornoLos Lagos Region, Chile
    2078.8×
  3. 3TemucoAraucania, Chile
    1877.1×
  4. 4Santa Anita - Los FicusLima region, Peru
    1836.7×
  5. 5VillarricaAraucania, Chile
    1725.7×
  6. 6Puerto MonttLos Lagos Region, Chile
    1725.7×
  7. 7HualpénBiobio, Chile
    1725.7×
  8. 8La UniónLos Ríos Region, Chile
    1715.6×
  9. 9ValdiviaLos Ríos Region, Chile
    1574.2×
  10. 10TalcahuanoBiobio, Chile
    1543.9×
  11. 11DelhiDelhi, India
    1523.8×
  12. 12NacimientoBiobio, Chile
    1513.7×
  13. 12LimaLima Province, Peru
    1513.7×
  14. 14Puerto AysénAysén, Chile
    1513.7×
  15. 14San Francisco De BorjaLima region, Peru
    1513.7×
  16. 16CuranilahueBiobio, Chile
    1503.7×
  17. 17CoronelBiobio, Chile
    1493.7×
  18. 18JakartaJakarta, Indonesia
    1483.6×
  19. 19Lahorelow-cost sensorsPunjab, Pakistan
    1303.2×
  20. 20Icheon-siGyeonggi-do, South Korea
    1253.0×
  21. 20CoyhaiqueAysén, Chile
    1253.0×
  22. 22Dubailow-cost sensorsDubai, United Arab Emirates
    1222.9×
  23. 23PubalGyeonggi-do, South Korea
    1222.9×
  24. 24ManamaManama, Bahrain
    1182.8×
  25. 25HwadoGyeonggi-do, South Korea
    1172.8×
  26. 26Victoria de DurangoDurango, Mexico
    1162.8×
  27. 27Goyang-siGyeonggi-do, South Korea
    1122.7×
  28. 27HualquiBiobio, Chile
    1122.7×
  29. 29YeojuGyeonggi-do, South Korea
    1122.7×
  30. 29Gimpo-siGyeonggi-do, South Korea
    1122.7×
  31. 31Bucheon-siGyeonggi-do, South Korea
    1112.6×
  32. 32SeoulSeoul, South Korea
    1102.6×
  33. 33SeonghwanChungcheongnam-do, South Korea
    1102.6×
  34. 34OsanGyeonggi-do, South Korea
    1092.6×
  35. 34Hwaseong-siGyeonggi-do, South Korea
    1092.6×
  36. 36IncheonIncheon, South Korea
    1082.6×
  37. 37Ansan-siGyeonggi-do, South Korea
    1072.5×
  38. 38Guri-siGyeonggi-do, South Korea
    1072.5×
  39. 39ConcepciónBiobio, Chile
    1062.5×
  40. 40GwangmyeongGyeonggi-do, South Korea
    1052.5×
  41. 41GumiGyeongsangbuk-do, South Korea
    1042.5×
  42. 42JungpyongNorth Chungcheong, South Korea
    1032.4×
  43. 42San CarlosÑuble, Chile
    1032.4×
  44. 44KigaliKigali, Rwanda
    1032.4×
  45. 44AsanChungcheongnam-do, South Korea
    1032.4×
  46. 46Anyang-siGyeonggi-do, South Korea
    1032.4×
  47. 47TangjinChungcheongnam-do, South Korea
    1022.4×
  48. 48Puente AltoSantiago Metropolitan, Chile
    1012.4×
  49. 49PyeongtaekGyeonggi-do, South Korea
    1002.4×
  50. 49RancaguaO'Higgins Region, Chile
    1002.4×
  51. 51IksanJeollabuk-do, South Korea
    992.3×
  52. 52TalaganteSantiago Metropolitan, Chile
    982.3×
  53. 53Islamabadlow-cost sensorsIslamabad, Pakistan
    982.3×
  54. 54KinzanChungcheongnam-do, South Korea
    972.3×
  55. 55SantiagoSantiago Metropolitan, Chile
    972.3×
  56. 56Ban Talat BuengChon Buri, Thailand
    972.3×
  57. 56Hacienda Santa FeJalisco, Mexico
    972.3×
  58. 58WŏnjuGangwon-do, South Korea
    962.2×
  59. 58Chinch'ŏnNorth Chungcheong, South Korea
    962.2×
  60. 60Ganghwa-gunIncheon, South Korea
    962.2×
  61. 61Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa
    962.2×
  62. 62HaenamJeollanam-do, South Korea
    952.2×
  63. 62HanamGyeonggi-do, South Korea
    952.2×
  64. 62LinaresMaule Region, Chile
    952.2×
  65. 65CheorwonGangwon-do, South Korea
    952.2×
  66. 66Uijeongbu-siGyeonggi-do, South Korea
    942.2×
  67. 66CallaoCallao, Peru
    942.2×
  68. 68Yangp'yŏngGyeonggi-do, South Korea
    942.2×
  69. 68CuricóMaule Region, Chile
    942.2×
  70. 70WaegwanGyeongsangbuk-do, South Korea
    942.1×
  71. 71SangjuGyeongsangbuk-do, South Korea
    942.1×
  72. 72KwangyangJeollanam-do, South Korea
    942.1×
  73. 73NangenJeollabuk-do, South Korea
    932.1×
  74. 73WabuGyeonggi-do, South Korea
    932.1×
  75. 73HwawŏnDaegu, South Korea
    932.1×
  76. 76MunsanGyeonggi-do, South Korea
    932.1×
  77. 77GwangjuGyeonggi-do, South Korea
    932.1×
  78. 78YangjuGyeonggi-do, South Korea
    932.1×
  79. 79ToméBiobio, Chile
    922.1×
  80. 80YesanChungcheongnam-do, South Korea
    922.1×
  81. 80OkcheonNorth Chungcheong, South Korea
    922.1×
  82. 80San Pedro de la PazBiobio, Chile
    922.1×
  83. 83MiryangGyeongsangnam-do, South Korea
    912.1×
  84. 83CoquimboCoquimbo Region, Chile
    912.1×
  85. 85HayangGyeongsangbuk-do, South Korea
    912.0×
  86. 86SuwonGyeonggi-do, South Korea
    912.0×
  87. 86NajuJeollanam-do, South Korea
    912.0×
  88. 88ChungjuNorth Chungcheong, South Korea
    912.0×
  89. 89DaeguDaegu, South Korea
    902.0×
  90. 90NamyangjuGyeonggi-do, South Korea
    902.0×
  91. 91ChangsuJeollabuk-do, South Korea
    902.0×
  92. 92Gyeongsan-siGyeongsangbuk-do, South Korea
    902.0×
  93. 93YeongdongNorth Chungcheong, South Korea
    892.0×
  94. 94ChiguayanteBiobio, Chile
    892.0×
  95. 95BuanJeollabuk-do, South Korea
    892.0×
  96. 96GunsanJeollabuk-do, South Korea
    881.9×
  97. 97CopiapóAtacama, Chile
    881.9×
  98. 98HongseongChungcheongnam-do, South Korea
    881.9×
  99. 99YŏnmuChungcheongnam-do, South Korea
    871.9×
  100. 100GapyeongGyeonggi-do, South Korea
    871.9×
  101. 100AguascalientesAguascalientes, Mexico
    871.9×
  102. 102SuncheonJeollanam-do, South Korea
    871.9×
  103. 102SaltilloCoahuila, Mexico
    871.9×
  104. 104SejongSejong-si, South Korea
    861.9×
  105. 104JeongeupJeollabuk-do, South Korea
    861.9×
  106. 106WanjuJeollabuk-do, South Korea
    861.9×
  107. 106Cheongju-siNorth Chungcheong, South Korea
    861.9×
  108. 108GuadalajaraJalisco, Mexico
    861.8×
  109. 109YeongjuGyeongsangbuk-do, South Korea
    851.8×
  110. 109YecheonGyeongsangbuk-do, South Korea
    851.8×
  111. 111ShenyangLiaoning, China
    851.8×
  112. 111ChillánÑuble, Chile
    851.8×
  113. 111SeogwipoJeju-do, South Korea
    851.8×
  114. 114GuangzhouGuangdong, China
    851.8×
  115. 114QuilpuéValparaiso, Chile
    851.8×
  116. 116NamsaJeollabuk-do, South Korea
    851.8×
  117. 117KuryeJeollanam-do, South Korea
    851.8×
  118. 117KoesanNorth Chungcheong, South Korea
    851.8×
  119. 119MungyeongGyeongsangbuk-do, South Korea
    841.8×
  120. 119GimcheonGyeongsangbuk-do, South Korea
    841.8×
  121. 119CheonanChungcheongnam-do, South Korea
    841.8×
  122. 119TalcaMaule Region, Chile
    841.8×
  123. 119ChangnyeongGyeongsangnam-do, South Korea
    841.8×
  124. 124SantyokuGangwon-do, South Korea
    841.8×
  125. 124TlaquepaqueJalisco, Mexico
    841.8×
  126. 126RengoO'Higgins Region, Chile
    841.8×
  127. 127MasanGwangju, South Korea
    831.8×
  128. 127Jinan-gunJeollabuk-do, South Korea
    831.8×
  129. 127JangheungJeollanam-do, South Korea
    831.8×
  130. 127BoseongJeollanam-do, South Korea
    831.8×
  131. 127YeongamJeollanam-do, South Korea
    831.8×
  132. 132DaejeonDaejeon, South Korea
    831.7×
  133. 133Jeju CityJeju-do, South Korea
    821.7×
  134. 134ConcónValparaiso, Chile
    821.7×
  135. 135NonsanChungcheongnam-do, South Korea
    821.7×
  136. 135Seongnam-siGyeonggi-do, South Korea
    821.7×
  137. 137TocopillaAntofagasta, Chile
    821.7×
  138. 138BeolgyoJeollanam-do, South Korea
    821.7×
  139. 139BoryeongChungcheongnam-do, South Korea
    811.7×
  140. 140KunwiGyeongsangbuk-do, South Korea
    801.7×
  141. 140Los ÁngelesBiobio, Chile
    801.7×
  142. 140CauquenesMaule Region, Chile
    801.7×
  143. 143AshgabatAshgabat, Turkmenistan
    801.6×
  144. 143KimjeJeollabuk-do, South Korea
    801.6×
  145. 145GongjuChungcheongnam-do, South Korea
    801.6×
  146. 145HadongGyeongsangnam-do, South Korea
    801.6×
  147. 147Istanbullow-cost sensorsIstanbul, Turkey
    801.6×
  148. 147DamyangJeollanam-do, South Korea
    801.6×
  149. 147TuxtlaChiapas, Mexico
    801.6×
  150. 150AnseongGyeonggi-do, South Korea
    801.6×
  151. 151EisenGyeongsangbuk-do, South Korea
    791.6×
  152. 151PohangGyeongsangbuk-do, South Korea
    791.6×
  153. 151HwasunJeollanam-do, South Korea
    791.6×
  154. 154ChinjuGyeongsangnam-do, South Korea
    791.6×
  155. 155ImsilJeollabuk-do, South Korea
    791.6×
  156. 156GwangjuGwangju, South Korea
    791.6×
  157. 156ChuncheonGangwon-do, South Korea
    791.6×
  158. 158DushanbeDushanbe, Tajikistan
    781.6×
  159. 158ChennaiTamil Nadu, India
    781.6×
  160. 160MokpoJeollanam-do, South Korea
    781.6×
  161. 161Hongch’ŏnGangwon-do, South Korea
    771.6×
  162. 161GaigeturiJeju-do, South Korea
    771.6×
  163. 163QuinteroValparaiso, Chile
    771.5×
  164. 164AricaArica y Parinacota Region, Chile
    771.5×
  165. 165YeonilGyeongsangbuk-do, South Korea
    771.5×
  166. 165YangguGangwon-do, South Korea
    771.5×
  167. 167Khlong LuangPathum Thani, Thailand
    771.5×
  168. 168NaesŏGyeongsangnam-do, South Korea
    761.5×
  169. 169ChangwonGyeongsangnam-do, South Korea
    761.5×
  170. 170YangsanGyeongsangnam-do, South Korea
    761.5×
  171. 171Wan ChaiWan Chai, Hong Kong
    751.5×
  172. 172Bang NaBangkok, Thailand
    751.5×
  173. 173MonterreyNuevo León, Mexico
    751.5×
  174. 173Ciudad Benito JuárezNuevo León, Mexico
    751.5×
  175. 175JangseongJeollanam-do, South Korea
    751.5×
  176. 176YeonggwangJeollanam-do, South Korea
    751.5×
  177. 176JeonjuJeollabuk-do, South Korea
    751.5×
  178. 178UlsanUlsan, South Korea
    741.4×
  179. 179YeosuJeollanam-do, South Korea
    741.4×
  180. 179GwangyangJeollanam-do, South Korea
    741.4×
  181. 181San Luis PotosíSan Luis Potosí, Mexico
    741.4×
  182. 182AndongGyeongsangbuk-do, South Korea
    741.4×
  183. 183NeietsuGangwon-do, South Korea
    741.4×
  184. 183MuanJeollanam-do, South Korea
    741.4×
  185. 183SinhyeonGyeongsangnam-do, South Korea
    741.4×
  186. 183Dunedinlow-cost sensorsOtago, New Zealand
    741.4×
  187. 187Alto HospicioTarapacá, Chile
    731.4×
  188. 188BelmopanCayo District, Belize
    731.4×
  189. 189ChicoCalifornia, United States
    721.4×
  190. 190Cheongsong gunGyeongsangbuk-do, South Korea
    721.4×
  191. 191VilniusVilnius, Lithuania
    711.3×
  192. 191Donghae CityGangwon-do, South Korea
    711.3×
  193. 193BuyeoChungcheongnam-do, South Korea
    711.3×
  194. 193Viña del MarValparaiso, Chile
    711.3×
  195. 193SinanJeollanam-do, South Korea
    711.3×
  196. 196Santa AnitaJalisco, Mexico
    711.3×
  197. 197Vientianelow-cost sensorsVientiane Prefecture, Laos
    711.3×
  198. 197MéridaYucatán, Mexico
    711.3×
  199. 199ZhushanTaiwan, Taiwan
    711.3×
  200. 199HwacheonGangwon-do, South Korea
    711.3×

Top 200 of 2,500 shown.

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

Not covered: the government monitoring networks of China and Turkey, which publish no terms that let us reuse their readings. Most cities there are missing from this board, not clean. Why.

Use this board

SmogRank, most polluted cities, PM2.5, May 28, 2025, smogrank.com/history/2025-05-28 (accessed 3 Oct 2026).

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