SmogRank / History / April 27, 2023

Most polluted cities on April 27, 2023

1,316 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 354.0 µg/m³. Each city's own local calendar day.

← Piedras Negras 354.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 27, 2023, 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. 1Piedras NegrasCoahuila, Mexico
    500+23.6×
  2. 2Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    500+23.3×
  3. 3San CarlosÑuble, Chile
    1957.9×
  4. 3LinaresMaule Region, Chile
    1957.9×
  5. 5ChillánÑuble, Chile
    1897.3×
  6. 6TalcaMaule Region, Chile
    1725.7×
  7. 7Kathmandulow-cost sensorsBagmati Province, Nepal
    1725.7×
  8. 8Dhakalow-cost sensorsDhaka Division, Bangladesh
    1715.6×
  9. 9DelhiDelhi, India
    1685.3×
  10. 10CuricóMaule Region, Chile
    1685.3×
  11. 11BamakoBamako, Mali
    1675.2×
  12. 12RancaguaO'Higgins Region, Chile
    1604.5×
  13. 13CoyhaiqueAysén, Chile
    1604.5×
  14. 14San Luis PotosíSan Luis Potosí, Mexico
    1584.4×
  15. 15BeijingBeijing, China
    1544.0×
  16. 16NacimientoBiobio, Chile
    1533.8×
  17. 17CauquenesMaule Region, Chile
    1493.7×
  18. 18Ban HouakhouaBokeo, Laos
    1453.5×
  19. 19SantiagoSantiago Metropolitan, Chile
    1393.4×
  20. 20Bang NaBangkok, Thailand
    1383.4×
  21. 21CholulaPuebla, Mexico
    1373.3×
  22. 22HyderabadTelangana, India
    1353.3×
  23. 23Mae SaiChiang Rai, Thailand
    1343.3×
  24. 24Puente AltoSantiago Metropolitan, Chile
    1313.2×
  25. 25Los ÁngelesBiobio, Chile
    1303.2×
  26. 26BelmopanCayo District, Belize
    1303.1×
  27. 27Chiang MaiChiang Mai, Thailand
    1293.1×
  28. 28CuranilahueBiobio, Chile
    1273.1×
  29. 29ShanghaiShanghai, China
    1233.0×
  30. 30KhartoumKhartoum, Sudan
    1222.9×
  31. 31TalaganteSantiago Metropolitan, Chile
    1212.9×
  32. 32RabinalBaja Verapaz, Guatemala
    1192.9×
  33. 33HanoiHanoi, Vietnam
    1192.9×
  34. 33Guatemala CityGuatemala, Guatemala
    1192.9×
  35. 35BaghdadBaghdad, Iraq
    1182.8×
  36. 36LamphunLamphun, Thailand
    1172.8×
  37. 37Bueng KumBangkok, Thailand
    1122.7×
  38. 38CuernavacaMorelos, Mexico
    1122.7×
  39. 39Viña del MarValparaiso, Chile
    1112.6×
  40. 40Puerto VarasLos Lagos Region, Chile
    1112.6×
  41. 41Ban Samae DamBangkok, Thailand
    1102.6×
  42. 41Khan Na YaoBangkok, Thailand
    1102.6×
  43. 43YangonYangon, Myanmar
    1102.6×
  44. 44QuillotaValparaiso, Chile
    1082.6×
  45. 45CelayaGuanajuato, Mexico
    1072.5×
  46. 46Lahorelow-cost sensorsPunjab, Pakistan
    1072.5×
  47. 47Khlong Sam WaBangkok, Thailand
    1052.5×
  48. 48ColomboWestern Province, Sri Lanka
    1052.5×
  49. 49Bang KapiBangkok, Thailand
    1042.5×
  50. 50PhayaoPhayao, Thailand
    1042.4×
  51. 51Addis AbabaAddis Ababa, Ethiopia
    1032.4×
  52. 52Chiang RaiChiang Rai, Thailand
    1022.4×
  53. 53ValdiviaLos Ríos Region, Chile
    1012.4×
  54. 54Nong KhaemBangkok, Thailand
    992.3×
  55. 55LampangLampang, Thailand
    992.3×
  56. 55Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    992.3×
  57. 57Sing BuriSing Buri, Thailand
    982.3×
  58. 58Tha BoNong Khai, Thailand
    982.3×
  59. 58Mexico CityMexico City, Mexico
    982.3×
  60. 60Si Maha PhotPrachin Buri, Thailand
    972.3×
  61. 61HualpénBiobio, Chile
    972.2×
  62. 62MexicaliBaja California, Mexico
    962.2×
  63. 63CoronelBiobio, Chile
    962.2×
  64. 64ConcónValparaiso, Chile
    962.2×
  65. 65UttaraditUttaradit, Thailand
    952.2×
  66. 66Saphan SungBangkok, Thailand
    952.2×
  67. 67Lat KrabangBangkok, Thailand
    942.2×
  68. 68GuangzhouGuangdong, China
    942.2×
  69. 69Ubon RatchathaniUbon Ratchathani, Thailand
    942.1×
  70. 70La UniónLos Ríos Region, Chile
    932.1×
  71. 71Lak SiBangkok, Thailand
    932.1×
  72. 72BangkokBangkok, Thailand
    922.1×
  73. 73Kampalalow-cost sensorsCentral Region, Uganda
    922.1×
  74. 74OsornoLos Lagos Region, Chile
    912.0×
  75. 74Sai MaiBangkok, Thailand
    912.0×
  76. 76TalcahuanoBiobio, Chile
    912.0×
  77. 76QuinteroValparaiso, Chile
    912.0×
  78. 78Naucalpan de JuárezMéxico, Mexico
    912.0×
  79. 79Ban Khlong PrawetBangkok, Thailand
    902.0×
  80. 80PhichitPhichit, Thailand
    902.0×
  81. 81PhraePhrae, Thailand
    902.0×
  82. 82ToméBiobio, Chile
    902.0×
  83. 82Puerto AysénAysén, Chile
    902.0×
  84. 84Samut SakhonSamut Sakhon, Thailand
    892.0×
  85. 85Khlong LuangPathum Thani, Thailand
    892.0×
  86. 86Ciudad NezahualcoyotlMéxico, Mexico
    892.0×
  87. 87ChaiyaphumChaiyaphum, Thailand
    881.9×
  88. 88Samut PrakanSamut Prakan, Thailand
    881.9×
  89. 88Mueang NonthaburiNonthaburi, Thailand
    881.9×
  90. 90Ban ChangRayong, Thailand
    881.9×
  91. 91HualquiBiobio, Chile
    871.9×
  92. 92PhetchabunPhetchabun, Thailand
    871.9×
  93. 93Lop BuriLopburi, Thailand
    871.9×
  94. 94Suphan BuriSuphan Buri, Thailand
    871.9×
  95. 95PristinaPristina, Kosovo
    861.9×
  96. 95Si Sa KetSi Sa Ket, Thailand
    861.9×
  97. 97Nakhon RatchasimaNakhon Ratchasima, Thailand
    861.8×
  98. 98Phra PradaengSamut Prakan, Thailand
    851.8×
  99. 99Islamabadlow-cost sensorsIslamabad, Pakistan
    841.8×
  100. 99TemucoAraucania, Chile
    841.8×
  101. 99ConcepciónBiobio, Chile
    841.8×
  102. 102Pachuca de SotoHidalgo, Mexico
    841.8×
  103. 103Roi EtRoi Et, Thailand
    841.8×
  104. 104Bang Bo DistrictSamut Prakan, Thailand
    841.8×
  105. 105Chai NatChai Nat, Thailand
    831.8×
  106. 106SukhothaiSukhothai, Thailand
    831.8×
  107. 106Laem ChabangChon Buri, Thailand
    831.8×
  108. 106Los AngelesCalifornia, United States
    831.8×
  109. 109León de los AldamaGuanajuato, Mexico
    831.7×
  110. 110Silao de la VictoriaGuanajuato, Mexico
    821.7×
  111. 111LotaBiobio, Chile
    821.7×
  112. 112SalamancaGuanajuato, Mexico
    821.7×
  113. 113PakxanBolikhamsai, Laos
    811.7×
  114. 114KigaliKigali, Rwanda
    811.7×
  115. 115Udon ThaniUdon Thani, Thailand
    801.7×
  116. 115Túxpam de Rodríguez CanoVeracruz, Mexico
    801.7×
  117. 115AntofagastaAntofagasta, Chile
    801.7×
  118. 118RatchaburiRatchaburi, Thailand
    791.6×
  119. 118Buri RamBuriram, Thailand
    791.6×
  120. 118Puerto MonttLos Lagos Region, Chile
    791.6×
  121. 121Ciudad JuárezChihuahua, Mexico
    781.6×
  122. 122Wan ChaiWan Chai, Hong Kong
    781.6×
  123. 123SalorTashkent Region, Uzbekistan
    771.6×
  124. 124MonsWallonia, Belgium
    771.5×
  125. 124NaplesCampania, Italy
    771.5×
  126. 126Nakhon SawanNakhon Sawan, Thailand
    771.5×
  127. 127Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    771.5×
  128. 127HuelvaAndalusia, Spain
    771.5×
  129. 129KalasinKalasin, Thailand
    761.5×
  130. 130Nakhon PathomNakhon Pathom, Thailand
    761.5×
  131. 131SaraburiSaraburi, Thailand
    761.5×
  132. 132San Pedro de la PazBiobio, Chile
    761.5×
  133. 133BéthuneHauts-de-France, France
    751.5×
  134. 133Santiago de QuerétaroQuerétaro, Mexico
    751.5×
  135. 135RayongRayong, Thailand
    741.4×
  136. 136PueblaPuebla, Mexico
    741.4×
  137. 136ChiguayanteBiobio, Chile
    741.4×
  138. 136Lomitalow-cost sensorsCalifornia, United States
    741.4×
  139. 139LilleHauts-de-France, France
    731.4×
  140. 140Mong KokYau Tsim Mong District, Hong Kong
    731.4×
  141. 141AntananarivoAnalamanga, Madagascar
    731.4×
  142. 141DunkirkHauts-de-France, France
    731.4×
  143. 143AbasoloGuanajuato, Mexico
    731.4×
  144. 144ValenciennesHauts-de-France, France
    721.4×
  145. 145BurbankCalifornia, United States
    721.4×
  146. 146Ban Talat BuengChon Buri, Thailand
    721.4×
  147. 146RoeselareFlanders, Belgium
    721.4×
  148. 146IzegemFlanders, Belgium
    721.4×
  149. 149MenenFlanders, Belgium
    721.4×
  150. 150AshgabatAshgabat, Turkmenistan
    721.3×
  151. 150YalaYala, Thailand
    721.3×
  152. 152MumbaiMaharashtra, India
    711.3×
  153. 152GraysEngland, United Kingdom
    711.3×
  154. 152AndenneWallonia, Belgium
    711.3×
  155. 155ShenyangLiaoning, China
    711.3×
  156. 155BohumínMoravian-Silesian Region, Czechia
    711.3×
  157. 155TijuanaBaja California, Mexico
    711.3×
  158. 158KanchanaburiKanchanaburi, Thailand
    711.3×
  159. 158KortrijkFlanders, Belgium
    711.3×
  160. 158CopiapóAtacama, Chile
    711.3×
  161. 158GlendoraCalifornia, United States
    711.3×
  162. 162JülichNorth Rhine-Westphalia, Germany
    711.3×
  163. 162GuanajuatoGuanajuato, Mexico
    711.3×
  164. 164TournaiWallonia, Belgium
    711.3×
  165. 165Kwai ChungKwai Tsing District, Hong Kong
    701.3×
  166. 166ChanthaburiChanthaburi, Thailand
    701.3×
  167. 167ComptonCalifornia, United States
    691.3×
  168. 168CharleroiWallonia, Belgium
    691.3×
  169. 168GarcíaNuevo León, Mexico
    691.3×
  170. 170EvergemFlanders, Belgium
    691.2×
  171. 170TopekaKansas, United States
    691.2×
  172. 172KoksijdeFlanders, Belgium
    691.2×
  173. 172San Juan del RíoQuerétaro, Mexico
    691.2×
  174. 174San JoséSan José, Costa Rica
    691.2×
  175. 175HarrisburgPennsylvania, United States
    681.2×
  176. 176San DiegoCalifornia, United States
    681.2×
  177. 177Hua HinPrachuap Khiri Khan, Thailand
    681.2×
  178. 178Karachilow-cost sensorsSindh, Pakistan
    681.2×
  179. 178CarlislePennsylvania, United States
    681.2×
  180. 178Carsonlow-cost sensorsCalifornia, United States
    681.2×
  181. 181LiègeWallonia, Belgium
    671.2×
  182. 182Şabāḩ as SālimMubārak al Kabīr, Kuwait
    671.2×
  183. 183Tsuen WanTsuen Wan, Hong Kong
    671.2×
  184. 184AranyaprathetSa Kaeo, Thailand
    671.2×
  185. 184DouaiHauts-de-France, France
    671.2×
  186. 184Jurupa ValleyCalifornia, United States
    671.2×
  187. 187TratTrat, Thailand
    661.2×
  188. 187VictoriaCentral and Western, Hong Kong
    661.2×
  189. 187HavířovMoravian-Silesian Region, Czechia
    661.2×
  190. 190LebanonPennsylvania, United States
    661.2×
  191. 191NišCentral Serbia, Serbia
    661.1×
  192. 191BogotáBogota D.C., Colombia
    661.1×
  193. 193LondonEngland, United Kingdom
    661.1×
  194. 194San Tung Chung HangIslands, Hong Kong
    661.1×
  195. 195Tai PoTai Po, Hong Kong
    661.1×
  196. 195WeidenBavaria, Germany
    661.1×
  197. 195CoquimboCoquimbo Region, Chile
    661.1×
  198. 195IrapuatoGuanajuato, Mexico
    661.1×
  199. 195ShakopeeMinnesota, United States
    661.1×
  200. 200San Miguel de AllendeGuanajuato, Mexico
    651.1×

Top 200 of 1,316 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

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SmogRank, most polluted cities, PM2.5, April 27, 2023, smogrank.com/history/2023-04-27 (accessed 2 Oct 2026).

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