SmogRank / History / April 9, 2023

Most polluted cities on April 9, 2023

1,426 cities ranked by their average PM2.5 over the day; the worst was Mae Sai, Thailand, at 249.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 9, 2023. All episodes.

← Mae Sai 249.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for April 9, 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. 1Mae SaiChiang Rai, Thailand
    34816.6×
  2. 2N'DjamenaN’Djaména, Chad
    26412.6×
  3. 3Chiang RaiChiang Rai, Thailand
    24411.3×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    2139.2×
  5. 5Chiang MaiChiang Mai, Thailand
    2098.9×
  6. 6Lahorelow-cost sensorsPunjab, Pakistan
    1856.9×
  7. 7Kathmandulow-cost sensorsBagmati Province, Nepal
    1836.7×
  8. 8DelhiDelhi, India
    1766.1×
  9. 9Puerto VarasLos Lagos Region, Chile
    1715.6×
  10. 10OsornoLos Lagos Region, Chile
    1705.5×
  11. 11LoeiLoei, Thailand
    1685.4×
  12. 12JeddahMecca Region, Saudi Arabia
    1644.9×
  13. 13Novi PazarCentral Serbia, Serbia
    1624.7×
  14. 14AlexandriaAlexandria, Egypt
    1614.6×
  15. 15Mae SotTak, Thailand
    1594.5×
  16. 16MumbaiMaharashtra, India
    1564.2×
  17. 17BeijingBeijing, China
    1564.2×
  18. 18LazarevacCentral Serbia, Serbia
    1564.2×
  19. 19BaghdadBaghdad, Iraq
    1544.0×
  20. 20UttaraditUttaradit, Thailand
    1544.0×
  21. 21HanoiHanoi, Vietnam
    1533.9×
  22. 22ValjevoCentral Serbia, Serbia
    1493.7×
  23. 23KhartoumKhartoum, Sudan
    1413.5×
  24. 24SukhothaiSukhothai, Thailand
    1393.4×
  25. 25ObrenovacCentral Serbia, Serbia
    1383.4×
  26. 26JakartaJakarta, Indonesia
    1373.4×
  27. 27SmederevoCentral Serbia, Serbia
    1363.3×
  28. 28PančevoVojvodina, Serbia
    1293.1×
  29. 28BamakoBamako, Mali
    1293.1×
  30. 30Ga-RankuwaNorth West, South Africa
    1273.1×
  31. 31Ubon RatchathaniUbon Ratchathani, Thailand
    1222.9×
  32. 32GuangzhouGuangdong, China
    1212.9×
  33. 33ZemunCentral Serbia, Serbia
    1182.8×
  34. 34BremerhavenBremen, Germany
    1162.8×
  35. 34NacimientoBiobio, Chile
    1162.8×
  36. 36YangonYangon, Myanmar
    1152.8×
  37. 37CottbusBrandenburg, Germany
    1152.7×
  38. 38IaşiIași County, Romania
    1142.7×
  39. 39BelgradeCentral Serbia, Serbia
    1132.7×
  40. 39HyderabadTelangana, India
    1132.7×
  41. 41ShenyangLiaoning, China
    1132.7×
  42. 42NišCentral Serbia, Serbia
    1122.7×
  43. 43WilhelmshavenLower Saxony, Germany
    1122.7×
  44. 44ValdiviaLos Ríos Region, Chile
    1112.6×
  45. 45KragujevacCentral Serbia, Serbia
    1112.6×
  46. 46CuranilahueBiobio, Chile
    1102.6×
  47. 47FutogVojvodina, Serbia
    1092.6×
  48. 48ČačakCentral Serbia, Serbia
    1072.5×
  49. 49Ponca CityOklahoma, United States
    1062.5×
  50. 50TlaquepaqueJalisco, Mexico
    1052.5×
  51. 51Tha BoNong Khai, Thailand
    1052.5×
  52. 52ŁaskŁódź Voivodeship, Poland
    1032.4×
  53. 52Novi SadVojvodina, Serbia
    1032.4×
  54. 54TemucoAraucania, Chile
    1032.4×
  55. 55Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1032.4×
  56. 56AshgabatAshgabat, Turkmenistan
    1032.4×
  57. 57HamburgHamburg, Germany
    1022.4×
  58. 58PirotCentral Serbia, Serbia
    1012.4×
  59. 59Udon ThaniUdon Thani, Thailand
    1002.3×
  60. 59Suphan BuriSuphan Buri, Thailand
    1002.3×
  61. 61Puerto MonttLos Lagos Region, Chile
    992.3×
  62. 62SremčicaCentral Serbia, Serbia
    992.3×
  63. 63RoeselareFlanders, Belgium
    992.3×
  64. 63Český TěšínMoravian-Silesian Region, Czechia
    992.3×
  65. 65Islamabadlow-cost sensorsIslamabad, Pakistan
    992.3×
  66. 65BohumínMoravian-Silesian Region, Czechia
    992.3×
  67. 65MexicaliBaja California, Mexico
    992.3×
  68. 68CoronelBiobio, Chile
    982.3×
  69. 69La UniónLos Ríos Region, Chile
    982.3×
  70. 70ItzehoeSchleswig-Holstein, Germany
    972.3×
  71. 71HavířovMoravian-Silesian Region, Czechia
    972.3×
  72. 71Tepeji del Río de OcampoHidalgo, Mexico
    972.3×
  73. 73MonsWallonia, Belgium
    972.2×
  74. 74Mong KokYau Tsim Mong District, Hong Kong
    962.2×
  75. 75RatchaburiRatchaburi, Thailand
    962.2×
  76. 75PakxanBolikhamsai, Laos
    962.2×
  77. 75EtwatwaGauteng, South Africa
    962.2×
  78. 78Şabāḩ as SālimMubārak al Kabīr, Kuwait
    962.2×
  79. 79Bang NaBangkok, Thailand
    962.2×
  80. 79CalaisHauts-de-France, France
    962.2×
  81. 79ChillánÑuble, Chile
    962.2×
  82. 82EvergemFlanders, Belgium
    962.2×
  83. 83San CarlosÑuble, Chile
    952.2×
  84. 84KortrijkFlanders, Belgium
    952.2×
  85. 85Si Maha PhotPrachin Buri, Thailand
    942.1×
  86. 85PhichitPhichit, Thailand
    942.1×
  87. 85's-GravenzandeSouth Holland, The Netherlands
    942.1×
  88. 88Lop BuriLopburi, Thailand
    942.1×
  89. 89PristinaPristina, Kosovo
    942.1×
  90. 89OldenburgLower Saxony, Germany
    942.1×
  91. 89MünsterNorth Rhine-Westphalia, Germany
    942.1×
  92. 89San Francisco TlalcilalcalpanMéxico, Mexico
    942.1×
  93. 89Khlong Sam WaBangkok, Thailand
    942.1×
  94. 94Bang Khun ThianBangkok, Thailand
    932.1×
  95. 94TalaganteSantiago Metropolitan, Chile
    932.1×
  96. 94GuadalajaraJalisco, Mexico
    932.1×
  97. 97Blankenfelde-MahlowBrandenburg, Germany
    932.1×
  98. 98Wan ChaiWan Chai, Hong Kong
    932.1×
  99. 98Valašské MeziříčíZlín, Czechia
    932.1×
  100. 100San Mateo AtencoMéxico, Mexico
    922.1×
  101. 101BorCentral Serbia, Serbia
    912.1×
  102. 101Frýdek-MístekMoravian-Silesian Region, Czechia
    912.1×
  103. 101TolucaMéxico, Mexico
    912.1×
  104. 101HualpénBiobio, Chile
    912.1×
  105. 105OstravaMoravian-Silesian Region, Czechia
    912.0×
  106. 106HualquiBiobio, Chile
    912.0×
  107. 107Buri RamBuriram, Thailand
    912.0×
  108. 107BraunschweigLower Saxony, Germany
    912.0×
  109. 109OsnabrückLower Saxony, Germany
    902.0×
  110. 109FriesoytheLower Saxony, Germany
    902.0×
  111. 109BremenBremen, Germany
    902.0×
  112. 109CelayaGuanajuato, Mexico
    902.0×
  113. 113Tai PoTai Po, Hong Kong
    902.0×
  114. 113DěčínÚstí nad Labem Region, Czechia
    902.0×
  115. 115TalcahuanoBiobio, Chile
    892.0×
  116. 116Tsuen WanTsuen Wan, Hong Kong
    892.0×
  117. 116RoubaixHauts-de-France, France
    892.0×
  118. 118IzegemFlanders, Belgium
    892.0×
  119. 119Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    892.0×
  120. 119Tin Shui WaiYuen Long, Hong Kong
    892.0×
  121. 119Kwai ChungKwai Tsing District, Hong Kong
    892.0×
  122. 122BielefeldNorth Rhine-Westphalia, Germany
    881.9×
  123. 122Viña del MarValparaiso, Chile
    881.9×
  124. 124Nong ChokBangkok, Thailand
    881.9×
  125. 125XonacatlánMéxico, Mexico
    881.9×
  126. 125SantiagoSantiago Metropolitan, Chile
    881.9×
  127. 127Khan Na YaoBangkok, Thailand
    881.9×
  128. 128LinaresMaule Region, Chile
    871.9×
  129. 129MenenFlanders, Belgium
    871.9×
  130. 129QuinteroValparaiso, Chile
    871.9×
  131. 129QuillotaValparaiso, Chile
    871.9×
  132. 132VictoriaCentral and Western, Hong Kong
    871.9×
  133. 132ArrecifeCanary Islands, Spain
    871.9×
  134. 132KasselHesse, Germany
    871.9×
  135. 132ZapopanJalisco, Mexico
    871.9×
  136. 136Khlong LuangPathum Thani, Thailand
    871.9×
  137. 136LotaBiobio, Chile
    871.9×
  138. 136Los ÁngelesBiobio, Chile
    871.9×
  139. 139Bang KapiBangkok, Thailand
    861.9×
  140. 140BurgosCastille and León, Spain
    851.8×
  141. 140CuricóMaule Region, Chile
    851.8×
  142. 142Saphan SungBangkok, Thailand
    851.8×
  143. 143MaassluisSouth Holland, The Netherlands
    851.8×
  144. 143MaldegemFlanders, Belgium
    851.8×
  145. 145EnschedeOverijssel, The Netherlands
    851.8×
  146. 145LilleHauts-de-France, France
    851.8×
  147. 147MukdahanMukdahan, Thailand
    851.8×
  148. 148FanlingNorth District, Hong Kong
    841.8×
  149. 149EisenhüttenstadtBrandenburg, Germany
    841.8×
  150. 149RancaguaO'Higgins Region, Chile
    841.8×
  151. 149Sai MaiBangkok, Thailand
    841.8×
  152. 152GentFlanders, Belgium
    841.8×
  153. 152GöttingenLower Saxony, Germany
    841.8×
  154. 152WittenbergSaxony-Anhalt, Germany
    841.8×
  155. 155Bueng KumBangkok, Thailand
    841.8×
  156. 156The HagueSouth Holland, The Netherlands
    831.8×
  157. 157SeafordEngland, United Kingdom
    831.8×
  158. 157Frankfurt (Oder)Brandenburg, Germany
    831.8×
  159. 159BeverenFlanders, Belgium
    831.8×
  160. 160TeltowBrandenburg, Germany
    831.7×
  161. 161LochristiFlanders, Belgium
    821.7×
  162. 161TalcaMaule Region, Chile
    821.7×
  163. 163Lak SiBangkok, Thailand
    821.7×
  164. 164Velsen-ZuidNorth Holland, The Netherlands
    821.7×
  165. 164PotsdamBrandenburg, Germany
    821.7×
  166. 166LiberecLiberec Region, Czechia
    821.7×
  167. 167West FargoNorth Dakota, United States
    821.7×
  168. 168Botevgradlow-cost sensorsSofia, Bulgaria
    821.7×
  169. 168BerlinState of Berlin, Germany
    821.7×
  170. 168KutnoŁódź Voivodeship, Poland
    821.7×
  171. 168ToméBiobio, Chile
    821.7×
  172. 168Puente AltoSantiago Metropolitan, Chile
    821.7×
  173. 168Lat KrabangBangkok, Thailand
    821.7×
  174. 174Halle (Saale)Saxony-Anhalt, Germany
    811.7×
  175. 174UžiceCentral Serbia, Serbia
    811.7×
  176. 176OytenLower Saxony, Germany
    811.7×
  177. 177ZgierzŁódź Voivodeship, Poland
    811.7×
  178. 178Kampalalow-cost sensorsCentral Region, Uganda
    811.7×
  179. 178ThembisaGauteng, South Africa
    811.7×
  180. 180DelmenhorstLower Saxony, Germany
    801.7×
  181. 180BéthuneHauts-de-France, France
    801.7×
  182. 180MostÚstí nad Labem Region, Czechia
    801.7×
  183. 183ZaanstadNorth Holland, The Netherlands
    801.6×
  184. 183PalenciaCastille and León, Spain
    801.6×
  185. 183ConcónValparaiso, Chile
    801.6×
  186. 183CauquenesMaule Region, Chile
    801.6×
  187. 187RotterdamSouth Holland, The Netherlands
    801.6×
  188. 187TournaiWallonia, Belgium
    801.6×
  189. 189MühlhausenThuringia, Germany
    801.6×
  190. 190BrakpanGauteng, South Africa
    801.6×
  191. 191San Tung Chung HangIslands, Hong Kong
    791.6×
  192. 191ConakryConakry, Guinea
    791.6×
  193. 191EindhovenNorth Brabant, The Netherlands
    791.6×
  194. 191NauenBrandenburg, Germany
    791.6×
  195. 195Sha TinSha Tin, Hong Kong
    791.6×
  196. 195Puerto AysénAysén, Chile
    791.6×
  197. 197KöthenSaxony-Anhalt, Germany
    791.6×
  198. 197Banja LukaSrpska, Bosnia and Herzegovina
    791.6×
  199. 199AntwerpFlanders, Belgium
    781.6×
  200. 199ValenciennesHauts-de-France, France
    781.6×

Top 200 of 1,426 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 9, 2023, smogrank.com/history/2023-04-09 (accessed 2 Oct 2026).

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