SmogRank / History / April 30, 2023

Most polluted cities on April 30, 2023

1,491 cities ranked by their average PM2.5 over the day; the worst was Bloemfontein, South Africa, at 103.0 µg/m³. Each city's own local calendar day.

← Bloemfontein 103.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for April 30, 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. 1BloemfonteinFree State, South Africa
    1846.9×
  2. 2Kathmandulow-cost sensorsBagmati Province, Nepal
    1756.0×
  3. 3ManamaManama, Bahrain
    1614.7×
  4. 4Dhakalow-cost sensorsDhaka Division, Bangladesh
    1594.4×
  5. 5Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1564.2×
  6. 6NanNan, Thailand
    1523.8×
  7. 7BamakoBamako, Mali
    1523.8×
  8. 8DelhiDelhi, India
    1373.3×
  9. 9Chiang MaiChiang Mai, Thailand
    1363.3×
  10. 10Mae SaiChiang Rai, Thailand
    1363.3×
  11. 11Ban HouakhouaBokeo, Laos
    1353.3×
  12. 12Puerto VarasLos Lagos Region, Chile
    1273.1×
  13. 13Chiang RaiChiang Rai, Thailand
    1263.1×
  14. 14Islamabadlow-cost sensorsIslamabad, Pakistan
    1243.0×
  15. 15ZapopanJalisco, Mexico
    1212.9×
  16. 16CholulaPuebla, Mexico
    1192.8×
  17. 17San Mateo AtencoMéxico, Mexico
    1182.8×
  18. 17Puerto AysénAysén, Chile
    1182.8×
  19. 19Hacienda Santa FeJalisco, Mexico
    1152.7×
  20. 20Lahorelow-cost sensorsPunjab, Pakistan
    1142.7×
  21. 21PhayaoPhayao, Thailand
    1132.7×
  22. 22LamphunLamphun, Thailand
    1122.7×
  23. 23Ubon RatchathaniUbon Ratchathani, Thailand
    1112.6×
  24. 24LampangLampang, Thailand
    1112.6×
  25. 25Ga-RankuwaNorth West, South Africa
    1102.6×
  26. 26SukhothaiSukhothai, Thailand
    1082.6×
  27. 26OsornoLos Lagos Region, Chile
    1082.6×
  28. 28TolucaMéxico, Mexico
    1082.6×
  29. 29GuadalajaraJalisco, Mexico
    1072.5×
  30. 30Suphan BuriSuphan Buri, Thailand
    1062.5×
  31. 31San Francisco TlalcilalcalpanMéxico, Mexico
    1052.5×
  32. 32ShanghaiShanghai, China
    1032.4×
  33. 33PhraePhrae, Thailand
    992.3×
  34. 34CelayaGuanajuato, Mexico
    992.3×
  35. 35La UniónLos Ríos Region, Chile
    982.3×
  36. 36Kamphaeng PhetKamphaeng Phet, Thailand
    972.2×
  37. 37UttaraditUttaradit, Thailand
    962.2×
  38. 38Ciudad Benito JuárezNuevo León, Mexico
    962.2×
  39. 39Bang NaBangkok, Thailand
    952.2×
  40. 40HanoiHanoi, Vietnam
    942.2×
  41. 41TakTak, Thailand
    942.2×
  42. 42YangonYangon, Myanmar
    942.1×
  43. 43PristinaPristina, Kosovo
    932.1×
  44. 43XonacatlánMéxico, Mexico
    932.1×
  45. 45Khlong Sam WaBangkok, Thailand
    932.1×
  46. 46Puerto MonttLos Lagos Region, Chile
    922.1×
  47. 47ValdiviaLos Ríos Region, Chile
    922.1×
  48. 48LoeiLoei, Thailand
    912.0×
  49. 49Sing BuriSing Buri, Thailand
    912.0×
  50. 49CuranilahueBiobio, Chile
    912.0×
  51. 49CoronelBiobio, Chile
    912.0×
  52. 52AshgabatAshgabat, Turkmenistan
    912.0×
  53. 53MexicaliBaja California, Mexico
    902.0×
  54. 54Novi PazarCentral Serbia, Serbia
    902.0×
  55. 54PhetchabunPhetchabun, Thailand
    902.0×
  56. 56RabinalBaja Verapaz, Guatemala
    902.0×
  57. 56Guatemala CityGuatemala, Guatemala
    902.0×
  58. 58KigaliKigali, Rwanda
    892.0×
  59. 58Khlong LuangPathum Thani, Thailand
    892.0×
  60. 60Ciudad JuárezChihuahua, Mexico
    892.0×
  61. 61Chai NatChai Nat, Thailand
    881.9×
  62. 62Nakhon SawanNakhon Sawan, Thailand
    871.9×
  63. 63LazarevacCentral Serbia, Serbia
    861.9×
  64. 64Khan Na YaoBangkok, Thailand
    861.9×
  65. 65GuangzhouGuangdong, China
    861.9×
  66. 66PhichitPhichit, Thailand
    861.9×
  67. 67Tha BoNong Khai, Thailand
    851.8×
  68. 67JakartaJakarta, Indonesia
    851.8×
  69. 69Bueng KumBangkok, Thailand
    851.8×
  70. 70DushanbeDushanbe, Tajikistan
    851.8×
  71. 70PakxanBolikhamsai, Laos
    851.8×
  72. 72ThembisaGauteng, South Africa
    851.8×
  73. 73Ban Samae DamBangkok, Thailand
    841.8×
  74. 74Nong KhaemBangkok, Thailand
    841.8×
  75. 74Saphan SungBangkok, Thailand
    841.8×
  76. 76Lop BuriLopburi, Thailand
    831.8×
  77. 77BéthuneHauts-de-France, France
    831.7×
  78. 78Si Sa KetSi Sa Ket, Thailand
    831.7×
  79. 78LiberecLiberec Region, Czechia
    831.7×
  80. 80Addis AbabaAddis Ababa, Ethiopia
    821.7×
  81. 80Si Maha PhotPrachin Buri, Thailand
    821.7×
  82. 82AntananarivoAnalamanga, Madagascar
    821.7×
  83. 82Udon ThaniUdon Thani, Thailand
    821.7×
  84. 82BrightonEngland, United Kingdom
    821.7×
  85. 82Lak SiBangkok, Thailand
    821.7×
  86. 86Nong ChokBangkok, Thailand
    811.7×
  87. 87VereenigingGauteng, South Africa
    811.7×
  88. 88ShenyangLiaoning, China
    811.7×
  89. 89Lat KrabangBangkok, Thailand
    801.7×
  90. 90AcharnésAttica, Greece
    801.6×
  91. 90Lagoslow-cost sensorsLagos, Nigeria
    801.6×
  92. 92Ban ChangRayong, Thailand
    801.6×
  93. 92Sai MaiBangkok, Thailand
    801.6×
  94. 94Nakhon RatchasimaNakhon Ratchasima, Thailand
    801.6×
  95. 95BelmopanCayo District, Belize
    801.6×
  96. 96Canvey IslandEngland, United Kingdom
    791.6×
  97. 97ObrenovacCentral Serbia, Serbia
    791.6×
  98. 97HyderabadTelangana, India
    791.6×
  99. 97MukdahanMukdahan, Thailand
    791.6×
  100. 97AntofagastaAntofagasta, Chile
    791.6×
  101. 101Roi EtRoi Et, Thailand
    791.6×
  102. 101HualquiBiobio, Chile
    791.6×
  103. 101CranbrookBritish Columbia, Canada
    791.6×
  104. 104Karachilow-cost sensorsSindh, Pakistan
    781.6×
  105. 104CardiffWales, United Kingdom
    781.6×
  106. 106ZemunCentral Serbia, Serbia
    781.6×
  107. 106KalasinKalasin, Thailand
    781.6×
  108. 106CoyhaiqueAysén, Chile
    781.6×
  109. 109Nong Bua LamphuNong Bua Lamphu, Thailand
    781.6×
  110. 110PortsmouthEngland, United Kingdom
    781.6×
  111. 111BangkokBangkok, Thailand
    771.6×
  112. 111Naucalpan de JuárezMéxico, Mexico
    771.6×
  113. 113CuernavacaMorelos, Mexico
    771.5×
  114. 114Ciudad NezahualcoyotlMéxico, Mexico
    771.5×
  115. 114TalcahuanoBiobio, Chile
    771.5×
  116. 116RatchaburiRatchaburi, Thailand
    761.5×
  117. 116Silao de la VictoriaGuanajuato, Mexico
    761.5×
  118. 118VanderbijlparkGauteng, South Africa
    761.5×
  119. 118Hat YaiSongkhla, Thailand
    761.5×
  120. 118San Juan del RíoQuerétaro, Mexico
    761.5×
  121. 121Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    761.5×
  122. 122Mueang NonthaburiNonthaburi, Thailand
    761.5×
  123. 122Khon KaenKhon Kaen, Thailand
    761.5×
  124. 122HualpénBiobio, Chile
    761.5×
  125. 125BaghdadBaghdad, Iraq
    751.5×
  126. 125ValenciennesHauts-de-France, France
    751.5×
  127. 125La Crescenta-Montroselow-cost sensorsCalifornia, United States
    751.5×
  128. 128PirotCentral Serbia, Serbia
    751.5×
  129. 128Bang KapiBangkok, Thailand
    751.5×
  130. 128Mexico CityMexico City, Mexico
    751.5×
  131. 131Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo
    741.4×
  132. 132PančevoVojvodina, Serbia
    741.4×
  133. 132Le HavreNormandy, France
    741.4×
  134. 134NišCentral Serbia, Serbia
    741.4×
  135. 134SasolburgFree State, South Africa
    741.4×
  136. 136Hua HinPrachuap Khiri Khan, Thailand
    741.4×
  137. 136RayongRayong, Thailand
    741.4×
  138. 136Ban Khlong PrawetBangkok, Thailand
    741.4×
  139. 139Laem ChabangChon Buri, Thailand
    731.4×
  140. 139CalaisHauts-de-France, France
    731.4×
  141. 141KragujevacCentral Serbia, Serbia
    731.4×
  142. 141DunkirkHauts-de-France, France
    731.4×
  143. 143Buri RamBuriram, Thailand
    731.4×
  144. 143GraysEngland, United Kingdom
    731.4×
  145. 143NacimientoBiobio, Chile
    731.4×
  146. 146PueblaPuebla, Mexico
    731.4×
  147. 147Ban Talat BuengChon Buri, Thailand
    721.4×
  148. 148SmederevoCentral Serbia, Serbia
    721.4×
  149. 148YalaYala, Thailand
    721.4×
  150. 148Samut PrakanSamut Prakan, Thailand
    721.4×
  151. 148ChanthaburiChanthaburi, Thailand
    721.4×
  152. 148SalamancaGuanajuato, Mexico
    721.4×
  153. 153AranyaprathetSa Kaeo, Thailand
    721.4×
  154. 154AthensAttica, Greece
    721.4×
  155. 155SouthamptonEngland, United Kingdom
    721.3×
  156. 155LeedsEngland, United Kingdom
    721.3×
  157. 155LilleHauts-de-France, France
    721.3×
  158. 155DěčínÚstí nad Labem Region, Czechia
    721.3×
  159. 155León de los AldamaGuanajuato, Mexico
    721.3×
  160. 160BelgradeCentral Serbia, Serbia
    711.3×
  161. 160Nakhon PathomNakhon Pathom, Thailand
    711.3×
  162. 160PrestonEngland, United Kingdom
    711.3×
  163. 160ValjevoCentral Serbia, Serbia
    711.3×
  164. 160TlaxcalaTlaxcala, Mexico
    711.3×
  165. 160BurbankCalifornia, United States
    711.3×
  166. 166Samut SakhonSamut Sakhon, Thailand
    711.3×
  167. 166Wan ChaiWan Chai, Hong Kong
    711.3×
  168. 168MonsWallonia, Belgium
    711.3×
  169. 169ĆuprijaCentral Serbia, Serbia
    711.3×
  170. 169CopiapóAtacama, Chile
    711.3×
  171. 171KhartoumKhartoum, Sudan
    701.3×
  172. 171Surat ThaniSurat Thani, Thailand
    701.3×
  173. 173RoubaixHauts-de-France, France
    701.3×
  174. 174Phra PradaengSamut Prakan, Thailand
    701.3×
  175. 175QuinteroValparaiso, Chile
    701.3×
  176. 175CoquimboCoquimbo Region, Chile
    701.3×
  177. 177San Tung Chung HangIslands, Hong Kong
    701.3×
  178. 177DagenhamEngland, United Kingdom
    701.3×
  179. 179ConcepciónBiobio, Chile
    691.3×
  180. 180DouaiHauts-de-France, France
    691.3×
  181. 180La SerenaCoquimbo Region, Chile
    691.3×
  182. 182SaraburiSaraburi, Thailand
    691.3×
  183. 183AsprópyrgosAttica, Greece
    691.2×
  184. 183ChaiyaphumChaiyaphum, Thailand
    691.2×
  185. 185Los AngelesCalifornia, United States
    691.2×
  186. 186BucharestBucharest, Romania
    681.2×
  187. 186BexleyEngland, United Kingdom
    681.2×
  188. 188TemucoAraucania, Chile
    681.2×
  189. 189TratTrat, Thailand
    681.2×
  190. 189Sakon NakhonSakon Nakhon, Thailand
    681.2×
  191. 189LotaBiobio, Chile
    681.2×
  192. 192BarnsleyEngland, United Kingdom
    681.2×
  193. 193TocopillaAntofagasta, Chile
    671.2×
  194. 193Agouralow-cost sensorsCalifornia, United States
    671.2×
  195. 193HobbsNew Mexico, United States
    671.2×
  196. 196GuanajuatoGuanajuato, Mexico
    671.2×
  197. 197CharleroiWallonia, Belgium
    671.2×
  198. 198CanterburyEngland, United Kingdom
    671.2×
  199. 198AmiensHauts-de-France, France
    671.2×
  200. 198Jastrzębie ZdrójSilesia, Poland
    671.2×

Top 200 of 1,491 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

Use this board

SmogRank, most polluted cities, PM2.5, April 30, 2023, smogrank.com/history/2023-04-30 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.