SmogRank / History / April 7, 2023

Most polluted cities on April 7, 2023

1,489 cities ranked by their average PM2.5 over the day; the worst was Mae Sai, Thailand, at 345.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 7, 2023. All episodes.

← Mae Sai 345.0 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every city ranked for April 7, 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
    500+23.0×
  2. 2PhayaoPhayao, Thailand
    32215.7×
  3. 3Chiang RaiChiang Rai, Thailand
    30615.2×
  4. 3NanNan, Thailand
    30615.2×
  5. 5Chiang MaiChiang Mai, Thailand
    29814.9×
  6. 6N'DjamenaN’Djaména, Chad
    29714.8×
  7. 7LoeiLoei, Thailand
    29014.3×
  8. 8LampangLampang, Thailand
    25712.1×
  9. 9LamphunLamphun, Thailand
    25111.7×
  10. 10Tha BoNong Khai, Thailand
    2219.7×
  11. 11PhraePhrae, Thailand
    2109.0×
  12. 12PakxanBolikhamsai, Laos
    2078.8×
  13. 13SukhothaiSukhothai, Thailand
    1998.3×
  14. 14Nong Bua LamphuNong Bua Lamphu, Thailand
    1917.5×
  15. 15Dhakalow-cost sensorsDhaka Division, Bangladesh
    1897.3×
  16. 16UttaraditUttaradit, Thailand
    1786.2×
  17. 17Kathmandulow-cost sensorsBagmati Province, Nepal
    1675.2×
  18. 18Nakhon SawanNakhon Sawan, Thailand
    1655.1×
  19. 19Sing BuriSing Buri, Thailand
    1644.9×
  20. 19BamakoBamako, Mali
    1644.9×
  21. 21Bang Khun ThianBangkok, Thailand
    1634.9×
  22. 22Chai NatChai Nat, Thailand
    1634.8×
  23. 23PhetchabunPhetchabun, Thailand
    1604.6×
  24. 24AlexandriaAlexandria, Egypt
    1594.4×
  25. 24ChaiyaphumChaiyaphum, Thailand
    1594.4×
  26. 26Khon KaenKhon Kaen, Thailand
    1584.4×
  27. 27Lop BuriLopburi, Thailand
    1584.4×
  28. 28TakTak, Thailand
    1584.3×
  29. 29PhichitPhichit, Thailand
    1574.3×
  30. 29Puerto MonttLos Lagos Region, Chile
    1574.3×
  31. 31Puerto VarasLos Lagos Region, Chile
    1564.2×
  32. 32Mae SotTak, Thailand
    1564.1×
  33. 33Sakon NakhonSakon Nakhon, Thailand
    1564.1×
  34. 34Ga-RankuwaNorth West, South Africa
    1554.0×
  35. 35Suphan BuriSuphan Buri, Thailand
    1544.0×
  36. 36ShanghaiShanghai, China
    1533.9×
  37. 37Novi PazarCentral Serbia, Serbia
    1523.8×
  38. 38EtwatwaGauteng, South Africa
    1523.8×
  39. 39OsornoLos Lagos Region, Chile
    1523.8×
  40. 40BloemfonteinFree State, South Africa
    1523.8×
  41. 41KalasinKalasin, Thailand
    1513.7×
  42. 42Lahorelow-cost sensorsPunjab, Pakistan
    1513.7×
  43. 43Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    1513.7×
  44. 44MukdahanMukdahan, Thailand
    1503.7×
  45. 45RatchaburiRatchaburi, Thailand
    1463.6×
  46. 46Ubon RatchathaniUbon Ratchathani, Thailand
    1433.5×
  47. 47Roi EtRoi Et, Thailand
    1433.5×
  48. 48GuadalajaraJalisco, Mexico
    1423.5×
  49. 49PristinaPristina, Kosovo
    1423.5×
  50. 49PirotCentral Serbia, Serbia
    1423.5×
  51. 51KanchanaburiKanchanaburi, Thailand
    1423.5×
  52. 52HanoiHanoi, Vietnam
    1403.4×
  53. 53KragujevacCentral Serbia, Serbia
    1393.4×
  54. 54NišCentral Serbia, Serbia
    1383.4×
  55. 55Bang NaBangkok, Thailand
    1303.1×
  56. 56Nong KhaemBangkok, Thailand
    1293.1×
  57. 57ThembisaGauteng, South Africa
    1263.0×
  58. 58MumbaiMaharashtra, India
    1233.0×
  59. 59Ban Samae DamBangkok, Thailand
    1233.0×
  60. 60TlaquepaqueJalisco, Mexico
    1222.9×
  61. 61Hua HinPrachuap Khiri Khan, Thailand
    1212.9×
  62. 62Nakhon RatchasimaNakhon Ratchasima, Thailand
    1192.9×
  63. 62ValjevoCentral Serbia, Serbia
    1192.9×
  64. 64Khlong Sam WaBangkok, Thailand
    1172.8×
  65. 65LazarevacCentral Serbia, Serbia
    1172.8×
  66. 66Tepeji del Río de OcampoHidalgo, Mexico
    1162.8×
  67. 67PančevoVojvodina, Serbia
    1162.8×
  68. 68HyderabadTelangana, India
    1152.7×
  69. 68SaraburiSaraburi, Thailand
    1152.7×
  70. 68Nakhon PathomNakhon Pathom, Thailand
    1152.7×
  71. 71JakartaJakarta, Indonesia
    1152.7×
  72. 72BangkokBangkok, Thailand
    1142.7×
  73. 73ManamaManama, Bahrain
    1122.7×
  74. 74Si Maha PhotPrachin Buri, Thailand
    1122.7×
  75. 74Lak SiBangkok, Thailand
    1122.7×
  76. 76Khlong LuangPathum Thani, Thailand
    1112.6×
  77. 77Jastrzębie ZdrójSilesia, Poland
    1112.6×
  78. 78Nong ChokBangkok, Thailand
    1102.6×
  79. 79Si Sa KetSi Sa Ket, Thailand
    1092.6×
  80. 80Sai MaiBangkok, Thailand
    1092.6×
  81. 81DelhiDelhi, India
    1082.6×
  82. 82Bang KapiBangkok, Thailand
    1072.5×
  83. 83Khan Na YaoBangkok, Thailand
    1062.5×
  84. 84Mueang NonthaburiNonthaburi, Thailand
    1052.5×
  85. 85ZemunCentral Serbia, Serbia
    1042.5×
  86. 85ConakryConakry, Guinea
    1042.5×
  87. 87La UniónLos Ríos Region, Chile
    1042.5×
  88. 88RabinalBaja Verapaz, Guatemala
    1042.4×
  89. 88Guatemala CityGuatemala, Guatemala
    1042.4×
  90. 90Saphan SungBangkok, Thailand
    1042.4×
  91. 91LincolnNebraska, United States
    1032.4×
  92. 91Bueng KumBangkok, Thailand
    1032.4×
  93. 93Karachilow-cost sensorsSindh, Pakistan
    1012.4×
  94. 94Jelenia GóraLower Silesia, Poland
    1002.3×
  95. 95SmederevoCentral Serbia, Serbia
    992.3×
  96. 96YangonYangon, Myanmar
    992.3×
  97. 97Islamabadlow-cost sensorsIslamabad, Pakistan
    982.3×
  98. 98BelgradeCentral Serbia, Serbia
    982.3×
  99. 99Lat KrabangBangkok, Thailand
    972.3×
  100. 100ZapopanJalisco, Mexico
    972.3×
  101. 101Buri RamBuriram, Thailand
    972.2×
  102. 102SalorTashkent Region, Uzbekistan
    962.2×
  103. 103ObrenovacCentral Serbia, Serbia
    962.2×
  104. 103Phra PradaengSamut Prakan, Thailand
    962.2×
  105. 105Ban Khlong PrawetBangkok, Thailand
    962.2×
  106. 106KhartoumKhartoum, Sudan
    962.2×
  107. 106Samut SakhonSamut Sakhon, Thailand
    962.2×
  108. 106Samut PrakanSamut Prakan, Thailand
    962.2×
  109. 109Novi SadVojvodina, Serbia
    942.1×
  110. 110JeddahMecca Region, Saudi Arabia
    942.1×
  111. 110SremčicaCentral Serbia, Serbia
    942.1×
  112. 110CoyhaiqueAysén, Chile
    942.1×
  113. 113Bielsko-BialaSilesia, Poland
    932.1×
  114. 114Ban ChangRayong, Thailand
    932.1×
  115. 114FutogVojvodina, Serbia
    932.1×
  116. 116BrakpanGauteng, South Africa
    922.1×
  117. 117CelayaGuanajuato, Mexico
    922.1×
  118. 118Ponca CityOklahoma, United States
    922.1×
  119. 119KłodzkoLower Silesia, Poland
    912.1×
  120. 119MexicaliBaja California, Mexico
    912.1×
  121. 121ČačakCentral Serbia, Serbia
    912.0×
  122. 121DěčínÚstí nad Labem Region, Czechia
    912.0×
  123. 123XonacatlánMéxico, Mexico
    902.0×
  124. 124SantiagoSantiago Metropolitan, Chile
    902.0×
  125. 125TalaganteSantiago Metropolitan, Chile
    902.0×
  126. 126Laem ChabangChon Buri, Thailand
    892.0×
  127. 126HualquiBiobio, Chile
    892.0×
  128. 128San Mateo AtencoMéxico, Mexico
    881.9×
  129. 128CholulaPuebla, Mexico
    881.9×
  130. 130CoronelBiobio, Chile
    881.9×
  131. 131San Andrés TuxtlaVeracruz, Mexico
    871.9×
  132. 131Puerto AysénAysén, Chile
    871.9×
  133. 133PueblaPuebla, Mexico
    871.9×
  134. 134Bang Bo DistrictSamut Prakan, Thailand
    861.9×
  135. 135Ban Talat BuengChon Buri, Thailand
    861.9×
  136. 136TijuanaBaja California, Mexico
    861.9×
  137. 137San Francisco TlalcilalcalpanMéxico, Mexico
    861.8×
  138. 138QuillotaValparaiso, Chile
    851.8×
  139. 139TarnówLesser Poland, Poland
    851.8×
  140. 140BorCentral Serbia, Serbia
    851.8×
  141. 141RacibórzSilesia, Poland
    841.8×
  142. 141KrakówLesser Poland, Poland
    841.8×
  143. 143Czechowice-DziedziceSilesia, Poland
    821.7×
  144. 143CuranilahueBiobio, Chile
    821.7×
  145. 145Frýdek-MístekMoravian-Silesian Region, Czechia
    821.7×
  146. 145RancaguaO'Higgins Region, Chile
    821.7×
  147. 147ToméBiobio, Chile
    821.7×
  148. 148Abujalow-cost sensorsFCT, Nigeria
    821.7×
  149. 148ValdiviaLos Ríos Region, Chile
    821.7×
  150. 148Puente AltoSantiago Metropolitan, Chile
    821.7×
  151. 151Addis AbabaAddis Ababa, Ethiopia
    811.7×
  152. 152Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    811.7×
  153. 153TocopillaAntofagasta, Chile
    811.7×
  154. 153HualpénBiobio, Chile
    811.7×
  155. 155LiberpolisCounty of Osijek-Baranja, Croatia
    811.7×
  156. 156HavířovMoravian-Silesian Region, Czechia
    801.7×
  157. 156TolucaMéxico, Mexico
    801.7×
  158. 158BaghdadBaghdad, Iraq
    801.6×
  159. 158CoatzacoalcosVeracruz, Mexico
    801.6×
  160. 160ChisinauChișinău Municipality, Moldova
    791.6×
  161. 160Surat ThaniSurat Thani, Thailand
    791.6×
  162. 160TalcahuanoBiobio, Chile
    791.6×
  163. 163BohumínMoravian-Silesian Region, Czechia
    791.6×
  164. 164TemucoAraucania, Chile
    791.6×
  165. 165MostÚstí nad Labem Region, Czechia
    781.6×
  166. 165BerounCentral Bohemia, Czechia
    781.6×
  167. 167JohannesburgGauteng, South Africa
    781.6×
  168. 168GyőrGyőr-Moson-Sopron, Hungary
    781.6×
  169. 168KatowiceSilesia, Poland
    781.6×
  170. 168CayenneGuyane, French Guiana
    781.6×
  171. 171AricaArica y Parinacota Region, Chile
    771.6×
  172. 172Le LamentinMartinique, Martinique
    771.5×
  173. 172CuricóMaule Region, Chile
    771.5×
  174. 174Şabāḩ as SālimMubārak al Kabīr, Kuwait
    771.5×
  175. 175ZlínZlín, Czechia
    771.5×
  176. 176ĆuprijaCentral Serbia, Serbia
    761.5×
  177. 176HartbeespoortNorth West, South Africa
    761.5×
  178. 178RayongRayong, Thailand
    761.5×
  179. 179Ciudad NezahualcoyotlMéxico, Mexico
    761.5×
  180. 180RengoO'Higgins Region, Chile
    761.5×
  181. 181PilsenPlzeň Region, Czechia
    751.5×
  182. 181Le RobertMartinique, Martinique
    751.5×
  183. 181NacimientoBiobio, Chile
    751.5×
  184. 184Botevgradlow-cost sensorsSofia, Bulgaria
    751.5×
  185. 184Hradec KrálovéHradec Králové Region, Czechia
    751.5×
  186. 186ChanthaburiChanthaburi, Thailand
    751.5×
  187. 186LimaLima Province, Peru
    751.5×
  188. 188LiberecLiberec Region, Czechia
    751.5×
  189. 189PraguePrague, Czechia
    751.5×
  190. 189Banja LukaSrpska, Bosnia and Herzegovina
    751.5×
  191. 191Almatylow-cost sensorsAlmaty, Kazakhstan
    741.4×
  192. 191Hat YaiSongkhla, Thailand
    741.4×
  193. 193PhuketPhuket, Thailand
    741.4×
  194. 193OlomoucOlomouc Region, Czechia
    741.4×
  195. 195AshgabatAshgabat, Turkmenistan
    741.4×
  196. 195QuinteroValparaiso, Chile
    741.4×
  197. 197ChiguayanteBiobio, Chile
    741.4×
  198. 198Bishkeklow-cost sensorsBishkek, Kyrgyzstan
    741.4×
  199. 198AranyaprathetSa Kaeo, Thailand
    741.4×
  200. 200ConcónValparaiso, Chile
    731.4×

Top 200 of 1,489 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 7, 2023, smogrank.com/history/2023-04-07 (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.