SmogRank / History / April 9, 2025

Most polluted cities on April 9, 2025

2,349 cities ranked by their average PM2.5 over the day; the worst was Coyhaique, Chile, at 102.3 µg/m³. Each city's own local calendar day.

← Coyhaique 102.3 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for April 9, 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. 1CoyhaiqueAysén, Chile
    1846.8×
  2. 2DelhiDelhi, India
    1806.4×
  3. 3Mae SaiChiang Rai, Thailand
    1796.4×
  4. 4Ubon RatchathaniUbon Ratchathani, Thailand
    1675.3×
  5. 6VillarricaAraucania, Chile
    1614.7×
  6. 7Amnat CharoenAmnat Charoen, Thailand
    1614.7×
  7. 8KruševacCentral Serbia, Serbia
    1594.5×
  8. 9Roi EtRoi Et, Thailand
    1554.1×
  9. 10ZaječarCentral Serbia, Serbia
    1533.9×
  10. 11MukdahanMukdahan, Thailand
    1513.7×
  11. 12LeskovacCentral Serbia, Serbia
    1493.7×
  12. 13KalasinKalasin, Thailand
    1463.6×
  13. 14NacimientoBiobio, Chile
    1433.5×
  14. 15Chiang RaiChiang Rai, Thailand
    1423.5×
  15. 16Chai NatChai Nat, Thailand
    1403.4×
  16. 17AguascalientesAguascalientes, Mexico
    1393.4×
  17. 18Vientianelow-cost sensorsVientiane Prefecture, Laos
    1373.3×
  18. 19ShenyangLiaoning, China
    1343.3×
  19. 20Maha SarakhamMaha Sarakham, Thailand
    1323.2×
  20. 21MexicaliBaja California, Mexico
    1293.1×
  21. 22ProkupljeCentral Serbia, Serbia
    1273.1×
  22. 23CuricóMaule Region, Chile
    1222.9×
  23. 24Novi PazarCentral Serbia, Serbia
    1222.9×
  24. 25VranjeCentral Serbia, Serbia
    1192.8×
  25. 26TlaquepaqueJalisco, Mexico
    1182.8×
  26. 27Islamabadlow-cost sensorsIslamabad, Pakistan
    1172.8×
  27. 28TemucoAraucania, Chile
    1142.7×
  28. 29Kamphaeng PhetKamphaeng Phet, Thailand
    1132.7×
  29. 30TocopillaAntofagasta, Chile
    1122.7×
  30. 31Victoria de DurangoDurango, Mexico
    1112.6×
  31. 32Nakhon SawanNakhon Sawan, Thailand
    1112.6×
  32. 33TalcaMaule Region, Chile
    1092.6×
  33. 34NišCentral Serbia, Serbia
    1082.6×
  34. 35HanoiHanoi, Vietnam
    1082.6×
  35. 35Sakon NakhonSakon Nakhon, Thailand
    1082.6×
  36. 37La UniónLos Ríos Region, Chile
    1082.5×
  37. 38Sing BuriSing Buri, Thailand
    1072.5×
  38. 39NanNan, Thailand
    1062.5×
  39. 40Si Sa KetSi Sa Ket, Thailand
    1042.5×
  40. 40LinaresMaule Region, Chile
    1042.5×
  41. 42Nakhon RatchasimaNakhon Ratchasima, Thailand
    1032.4×
  42. 43JinchengFukien, Taiwan
    1032.4×
  43. 44PhraePhrae, Thailand
    1022.4×
  44. 45ChaiyaphumChaiyaphum, Thailand
    1002.3×
  45. 46SantiagoSantiago Metropolitan, Chile
    992.3×
  46. 47Si Maha PhotPrachin Buri, Thailand
    992.3×
  47. 48SurinSurin, Thailand
    982.3×
  48. 48Puente AltoSantiago Metropolitan, Chile
    982.3×
  49. 50ChillánÑuble, Chile
    972.3×
  50. 51Lop BuriLopburi, Thailand
    972.3×
  51. 52ValjevoCentral Serbia, Serbia
    972.2×
  52. 53Nakhon LuangPhra Nakhon Si Ayutthaya, Thailand
    962.2×
  53. 53Banja LukaSrpska, Bosnia and Herzegovina
    962.2×
  54. 55GuangzhouGuangdong, China
    962.2×
  55. 56JakartaJakarta, Indonesia
    962.2×
  56. 57KanchanaburiKanchanaburi, Thailand
    952.2×
  57. 58TaoyuanTaiwan, Taiwan
    952.2×
  58. 59Ban ChangRayong, Thailand
    952.2×
  59. 60NeiliTaiwan, Taiwan
    952.2×
  60. 61Suphan BuriSuphan Buri, Thailand
    952.2×
  61. 61GumiGyeongsangbuk-do, South Korea
    952.2×
  62. 63Los ÁngelesBiobio, Chile
    942.2×
  63. 64TongyeongGyeongsangnam-do, South Korea
    942.1×
  64. 65CauquenesMaule Region, Chile
    932.1×
  65. 66PhayaoPhayao, Thailand
    932.1×
  66. 66CallaoCallao, Peru
    932.1×
  67. 68Bang Pakonglow-cost sensorsChachoengsao, Thailand
    922.1×
  68. 69Chiang MaiChiang Mai, Thailand
    922.1×
  69. 70KraljevoCentral Serbia, Serbia
    922.1×
  70. 70SukhothaiSukhothai, Thailand
    922.1×
  71. 70Bang NaBangkok, Thailand
    922.1×
  72. 70UlsanUlsan, South Korea
    922.1×
  73. 74ErlunTaiwan, Taiwan
    922.1×
  74. 74RancaguaO'Higgins Region, Chile
    922.1×
  75. 76PohangGyeongsangbuk-do, South Korea
    912.0×
  76. 77Udon ThaniUdon Thani, Thailand
    912.0×
  77. 78Buri RamBuriram, Thailand
    902.0×
  78. 78RengoO'Higgins Region, Chile
    902.0×
  79. 80Santa AnitaJalisco, Mexico
    902.0×
  80. 81YeonilGyeongsangbuk-do, South Korea
    902.0×
  81. 82Medina Estateslow-cost sensorsGreater Accra, Ghana
    902.0×
  82. 84ConcónValparaiso, Chile
    892.0×
  83. 85ČačakCentral Serbia, Serbia
    892.0×
  84. 86Ganghwa-gunIncheon, South Korea
    892.0×
  85. 86HayangGyeongsangbuk-do, South Korea
    892.0×
  86. 88BusanBusan, South Korea
    881.9×
  87. 89Gimpo-siGyeonggi-do, South Korea
    881.9×
  88. 89GijangBusan, South Korea
    881.9×
  89. 91IncheonIncheon, South Korea
    881.9×
  90. 91TalaganteSantiago Metropolitan, Chile
    881.9×
  91. 91San CarlosÑuble, Chile
    881.9×
  92. 94YuanlinTaiwan, Taiwan
    881.9×
  93. 95DaeguDaegu, South Korea
    881.9×
  94. 96KrotoszynGreater Poland, Poland
    881.9×
  95. 96New Taipei CityTaipei, Taiwan
    881.9×
  96. 98TaipeiTaiwan, Taiwan
    871.9×
  97. 98MiryangGyeongsangnam-do, South Korea
    871.9×
  98. 98Gyeongsan-siGyeongsangbuk-do, South Korea
    871.9×
  99. 101Puerto AysénAysén, Chile
    871.9×
  100. 102UžiceCentral Serbia, Serbia
    871.9×
  101. 103DurangoBasque Country, Spain
    861.9×
  102. 104RatchaburiRatchaburi, Thailand
    861.9×
  103. 104AmorebietaBasque Country, Spain
    861.9×
  104. 104CuranilahueBiobio, Chile
    861.9×
  105. 104Khlong Sam WaBangkok, Thailand
    861.9×
  106. 108CheorwonGangwon-do, South Korea
    861.9×
  107. 108QuinteroValparaiso, Chile
    861.9×
  108. 110ManamaManama, Bahrain
    861.8×
  109. 110BilbaoBasque Country, Spain
    861.8×
  110. 112Puerto VarasLos Lagos Region, Chile
    851.8×
  111. 113YeongjuGyeongsangbuk-do, South Korea
    851.8×
  112. 114SeonghwanChungcheongnam-do, South Korea
    851.8×
  113. 114UngsangGyeongsangnam-do, South Korea
    851.8×
  114. 114NaesŏGyeongsangnam-do, South Korea
    851.8×
  115. 114QuillotaValparaiso, Chile
    851.8×
  116. 114HualpénBiobio, Chile
    851.8×
  117. 119GyeongjuGyeongsangbuk-do, South Korea
    851.8×
  118. 120ErlinTaiwan, Taiwan
    851.8×
  119. 120ZhubeiTaiwan, Taiwan
    851.8×
  120. 120Wan ChaiWan Chai, Hong Kong
    851.8×
  121. 120OriaBasque Country, Spain
    851.8×
  122. 120Puerto MonttLos Lagos Region, Chile
    851.8×
  123. 125ĆuprijaCentral Serbia, Serbia
    841.8×
  124. 125UttaraditUttaradit, Thailand
    841.8×
  125. 125GoseongGyeongsangnam-do, South Korea
    841.8×
  126. 125GapyeongGyeonggi-do, South Korea
    841.8×
  127. 125HualquiBiobio, Chile
    841.8×
  128. 125Lat KrabangBangkok, Thailand
    841.8×
  129. 131WŏnjuGangwon-do, South Korea
    841.8×
  130. 131AndongGyeongsangbuk-do, South Korea
    841.8×
  131. 131GeojeGyeongsangnam-do, South Korea
    841.8×
  132. 134WaegwanGyeongsangbuk-do, South Korea
    841.8×
  133. 134PubalGyeonggi-do, South Korea
    841.8×
  134. 134HwawŏnDaegu, South Korea
    841.8×
  135. 134GwangmyeongGyeonggi-do, South Korea
    841.8×
  136. 134ValdiviaLos Ríos Region, Chile
    841.8×
  137. 139Nong Bua LamphuNong Bua Lamphu, Thailand
    841.8×
  138. 139KimhaeGyeongsangnam-do, South Korea
    841.8×
  139. 139ŻywiecSilesia, Poland
    841.8×
  140. 142DouliuTaiwan, Taiwan
    841.8×
  141. 143LoznicaCentral Serbia, Serbia
    831.8×
  142. 144LamphunLamphun, Thailand
    831.8×
  143. 145LazarevacCentral Serbia, Serbia
    831.8×
  144. 145PhichitPhichit, Thailand
    831.8×
  145. 147LampangLampang, Thailand
    831.7×
  146. 147GimcheonGyeongsangbuk-do, South Korea
    831.7×
  147. 147OsornoLos Lagos Region, Chile
    831.7×
  148. 150Bielsko-BialaSilesia, Poland
    831.7×
  149. 151PhetchabunPhetchabun, Thailand
    821.7×
  150. 151ChanghuaTaiwan, Taiwan
    821.7×
  151. 153CoronelBiobio, Chile
    821.7×
  152. 154LoeiLoei, Thailand
    821.7×
  153. 154Hacienda Santa FeJalisco, Mexico
    821.7×
  154. 156SantyokuGangwon-do, South Korea
    821.7×
  155. 156Hwaseong-siGyeonggi-do, South Korea
    821.7×
  156. 156TamanoOkayama, Japan
    821.7×
  157. 156Jastrzębie ZdrójSilesia, Poland
    821.7×
  158. 160DaxiTaiwan, Taiwan
    821.7×
  159. 160GunsanJeollabuk-do, South Korea
    821.7×
  160. 162PožarevacCentral Serbia, Serbia
    821.7×
  161. 162Mae SotTak, Thailand
    821.7×
  162. 162IksanJeollabuk-do, South Korea
    821.7×
  163. 162ChangwonGyeongsangnam-do, South Korea
    821.7×
  164. 162KurashikiOkayama, Japan
    821.7×
  165. 167ShulinTaipei, Taiwan
    811.7×
  166. 168ZhushanTaiwan, Taiwan
    811.7×
  167. 168Bucheon-siGyeonggi-do, South Korea
    811.7×
  168. 168MunsanGyeonggi-do, South Korea
    811.7×
  169. 168CholulaPuebla, Mexico
    811.7×
  170. 172SeoulSeoul, South Korea
    811.7×
  171. 172Ansan-siGyeonggi-do, South Korea
    811.7×
  172. 172Accralow-cost sensorsGreater Accra, Ghana
    811.7×
  173. 175TaibaoTaiwan, Taiwan
    811.7×
  174. 175Goyang-siGyeonggi-do, South Korea
    811.7×
  175. 177Lak SiBangkok, Thailand
    801.7×
  176. 178TainanTaiwan, Taiwan
    801.7×
  177. 179MilanLombardy, Italy
    801.6×
  178. 179AsakuchiOkayama, Japan
    801.6×
  179. 181YeojuGyeonggi-do, South Korea
    801.6×
  180. 181YangsanGyeongsangnam-do, South Korea
    801.6×
  181. 181Guri-siGyeonggi-do, South Korea
    801.6×
  182. 181CoquimboCoquimbo Region, Chile
    801.6×
  183. 181Saphan SungBangkok, Thailand
    801.6×
  184. 186BeigangTaiwan, Taiwan
    801.6×
  185. 186PyeongtaekGyeonggi-do, South Korea
    801.6×
  186. 186ChinjuGyeongsangnam-do, South Korea
    801.6×
  187. 186SinhyeonGyeongsangnam-do, South Korea
    801.6×
  188. 186Cadereyta JiménezNuevo León, Mexico
    801.6×
  189. 191Ban Talat BuengChon Buri, Thailand
    791.6×
  190. 191KinzanChungcheongnam-do, South Korea
    791.6×
  191. 191ValenciaValencia, Spain
    791.6×
  192. 191QuilpuéValparaiso, Chile
    791.6×
  193. 191Khan Na YaoBangkok, Thailand
    791.6×
  194. 196EisenGyeongsangbuk-do, South Korea
    791.6×
  195. 196JungpyongNorth Chungcheong, South Korea
    791.6×
  196. 196KariyaHyōgo, Japan
    791.6×
  197. 196ŠabacCentral Serbia, Serbia
    791.6×
  198. 196ChangnyeongGyeongsangnam-do, South Korea
    791.6×

Top 200 of 2,349 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, April 9, 2025, smogrank.com/history/2025-04-09 (accessed 2 Oct 2026).

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