SmogRank / History / April 1, 2024

Most polluted cities on April 1, 2024

2,060 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 244.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during April 1, 2024. All episodes.

← N'Djamena 244.0 µg/m³ 200 µg/m³15 WHO 24-hour guideline
Every city ranked for April 1, 2024, 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. 1N'DjamenaN’Djaména, Chad
    33816.3×
  2. 2Mae SaiChiang Rai, Thailand
    2199.6×
  3. 3PhayaoPhayao, Thailand
    1867.0×
  4. 4LampangLampang, Thailand
    1846.8×
  5. 5Vientianelow-cost sensorsVientiane Prefecture, Laos
    1826.6×
  6. 6NanNan, Thailand
    1766.1×
  7. 7Chiang MaiChiang Mai, Thailand
    1766.1×
  8. 8Mae SotTak, Thailand
    1715.6×
  9. 9UttaraditUttaradit, Thailand
    1685.3×
  10. 10PhraePhrae, Thailand
    1675.3×
  11. 11Chiang RaiChiang Rai, Thailand
    1675.2×
  12. 12LamphunLamphun, Thailand
    1655.0×
  13. 13Kamphaeng PhetKamphaeng Phet, Thailand
    1655.0×
  14. 14JakartaJakarta, Indonesia
    1644.9×
  15. 15SukhothaiSukhothai, Thailand
    1634.8×
  16. 16TolucaMéxico, Mexico
    1604.6×
  17. 17Dhakalow-cost sensorsDhaka Division, Bangladesh
    1584.4×
  18. 18EsztergomKomárom-Esztergom, Hungary
    1584.4×
  19. 19DelhiDelhi, India
    1574.3×
  20. 20LoeiLoei, Thailand
    1574.2×
  21. 21BihaćFederation of B&H, Bosnia and Herzegovina
    1564.2×
  22. 21Ciudad Benito JuárezNuevo León, Mexico
    1564.2×
  23. 23OsornoLos Lagos Region, Chile
    1564.1×
  24. 24Lahorelow-cost sensorsPunjab, Pakistan
    1554.1×
  25. 25San Salvador TizatlalliMéxico, Mexico
    1554.0×
  26. 26MartinŽilina Region, Slovakia
    1544.0×
  27. 27TřinecMoravian-Silesian Region, Czechia
    1544.0×
  28. 28Kathmandulow-cost sensorsBagmati Province, Nepal
    1533.9×
  29. 29KolkataWest Bengal, India
    1533.9×
  30. 30PrievidzaTrenčín Region, Slovakia
    1523.8×
  31. 31KanchanaburiKanchanaburi, Thailand
    1513.7×
  32. 31VeszprémVeszprém, Hungary
    1513.7×
  33. 33HanoiHanoi, Vietnam
    1493.7×
  34. 34SalernoCampania, Italy
    1463.6×
  35. 35MiskolcBorsod-Abaúj-Zemplén, Hungary
    1463.6×
  36. 36PhichitPhichit, Thailand
    1443.5×
  37. 37CairoCairo, Egypt
    1433.5×
  38. 38PrzemyślSubcarpathia, Poland
    1423.5×
  39. 39DunaújvárosFejér, Hungary
    1403.4×
  40. 40Valašské MeziříčíZlín, Czechia
    1403.4×
  41. 40OstravaMoravian-Silesian Region, Czechia
    1403.4×
  42. 42MukdahanMukdahan, Thailand
    1383.4×
  43. 43Karachilow-cost sensorsSindh, Pakistan
    1383.4×
  44. 44OpavaMoravian-Silesian Region, Czechia
    1373.3×
  45. 45Banja LukaSrpska, Bosnia and Herzegovina
    1373.3×
  46. 46PhetchabunPhetchabun, Thailand
    1363.3×
  47. 46BeijingBeijing, China
    1363.3×
  48. 48Udon ThaniUdon Thani, Thailand
    1353.3×
  49. 48Victoria de DurangoDurango, Mexico
    1353.3×
  50. 50PtujUrban Municipality of Ptuj, Slovenia
    1353.3×
  51. 51Frýdek-MístekMoravian-Silesian Region, Czechia
    1343.3×
  52. 52KalasinKalasin, Thailand
    1323.2×
  53. 52Wodzisław ŚląskiSilesia, Poland
    1323.2×
  54. 52CieszynSilesia, Poland
    1323.2×
  55. 55Novo MestoUrban Municipality of Novo Mesto, Slovenia
    1313.2×
  56. 56GyőrGyőr-Moson-Sopron, Hungary
    1283.1×
  57. 57Puerto VarasLos Lagos Region, Chile
    1273.1×
  58. 58HavířovMoravian-Silesian Region, Czechia
    1273.1×
  59. 59KomárnoNitra Region, Slovakia
    1273.1×
  60. 60BaghdadBaghdad, Iraq
    1263.0×
  61. 61Nakhon SawanNakhon Sawan, Thailand
    1263.0×
  62. 62Guatemala CityGuatemala, Guatemala
    1263.0×
  63. 63PécsBaranya, Hungary
    1253.0×
  64. 64MumbaiMaharashtra, India
    1243.0×
  65. 64Cadereyta JiménezNuevo León, Mexico
    1243.0×
  66. 66HyderabadTelangana, India
    1243.0×
  67. 67MariborUrban Municipality of Maribor, Slovenia
    1233.0×
  68. 68NaplesCampania, Italy
    1222.9×
  69. 69Puerto MonttLos Lagos Region, Chile
    1212.9×
  70. 70GyöngyösHeves County, Hungary
    1212.9×
  71. 71PruszkówMazovia, Poland
    1212.9×
  72. 72KigaliKigali, Rwanda
    1202.9×
  73. 72Novi PazarCentral Serbia, Serbia
    1202.9×
  74. 74Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1192.9×
  75. 75SarajevoFederation of B&H, Bosnia and Herzegovina
    1192.9×
  76. 76PřerovOlomouc Region, Czechia
    1182.8×
  77. 76LęborkPomerania, Poland
    1182.8×
  78. 78DziałdowoWarmia-Masuria, Poland
    1182.8×
  79. 79CeljeUrban Municipality of Celje, Slovenia
    1172.8×
  80. 80ChaiyaphumChaiyaphum, Thailand
    1172.8×
  81. 81StarachowiceŚwiętokrzyskie, Poland
    1172.8×
  82. 81Ciudad ApodacaNuevo León, Mexico
    1172.8×
  83. 83Nong Bua LamphuNong Bua Lamphu, Thailand
    1172.8×
  84. 84KrakówLesser Poland, Poland
    1172.8×
  85. 85KrosnoSubcarpathia, Poland
    1162.8×
  86. 85ŽilinaŽilina Region, Slovakia
    1162.8×
  87. 87Sing BuriSing Buri, Thailand
    1162.8×
  88. 88BardejovPrešov Region, Slovakia
    1152.7×
  89. 89Amnat CharoenAmnat Charoen, Thailand
    1142.7×
  90. 90MielecSubcarpathia, Poland
    1142.7×
  91. 91KościerzynaPomerania, Poland
    1132.7×
  92. 92Lop BuriLopburi, Thailand
    1122.7×
  93. 93ElblągWarmia-Masuria, Poland
    1122.7×
  94. 94Chai NatChai Nat, Thailand
    1112.6×
  95. 94CelayaGuanajuato, Mexico
    1112.6×
  96. 96OlsztynWarmia-Masuria, Poland
    1102.6×
  97. 97ShanghaiShanghai, China
    1102.6×
  98. 98YasothonYasothon, Thailand
    1092.6×
  99. 99Halle (Saale)Saxony-Anhalt, Germany
    1092.6×
  100. 100KutnoŁódź Voivodeship, Poland
    1092.6×
  101. 101SninaPrešov Region, Slovakia
    1092.6×
  102. 102Bielsko-BialaSilesia, Poland
    1082.6×
  103. 103Banská BystricaBanská Bystrica Region, Slovakia
    1082.6×
  104. 104KazincbarcikaBorsod-Abaúj-Zemplén, Hungary
    1082.6×
  105. 105WłocławekKujawsko-Pomorskie, Poland
    1082.5×
  106. 106LiepājaLiepaja, Latvia
    1072.5×
  107. 107GostivarGostivar, North Macedonia
    1072.5×
  108. 108LegionowoMazovia, Poland
    1072.5×
  109. 109KranjUrban Municipality of Kranj, Slovenia
    1062.5×
  110. 110SiedlceMazovia, Poland
    1062.5×
  111. 110GdyniaPomerania, Poland
    1062.5×
  112. 112Jastrzębie ZdrójSilesia, Poland
    1062.5×
  113. 113Islamabadlow-cost sensorsIslamabad, Pakistan
    1052.5×
  114. 114Khon KaenKhon Kaen, Thailand
    1052.5×
  115. 114TrbovljeMunicipality of Trbovlje, Slovenia
    1052.5×
  116. 116KlaipėdaKlaipėda County, Lithuania
    1042.5×
  117. 116Skarżysko-KamiennaŚwiętokrzyskie, Poland
    1042.5×
  118. 118Suphan BuriSuphan Buri, Thailand
    1042.5×
  119. 119ŻyrardówMazovia, Poland
    1042.4×
  120. 119MissionTexas, United States
    1042.4×
  121. 121Kędzierzyn-KoźleOpole Voivodeship, Poland
    1042.4×
  122. 122Sakon NakhonSakon Nakhon, Thailand
    1032.4×
  123. 122PartizánskeTrenčín Region, Slovakia
    1032.4×
  124. 124Konstancin-JeziornaMazovia, Poland
    1032.4×
  125. 124GyálPest County, Hungary
    1032.4×
  126. 126Czechowice-DziedziceSilesia, Poland
    1032.4×
  127. 127Ubon RatchathaniUbon Ratchathani, Thailand
    1032.4×
  128. 128RzeszówSubcarpathia, Poland
    1022.4×
  129. 129LublinLublin, Poland
    1022.4×
  130. 129BydgoszczKujawsko-Pomorskie, Poland
    1022.4×
  131. 131RacibórzSilesia, Poland
    1012.4×
  132. 132PrešovPrešov Region, Slovakia
    1012.4×
  133. 132PopradPrešov Region, Slovakia
    1012.4×
  134. 134AcerraCampania, Italy
    1002.4×
  135. 135Frankfurt (Oder)Brandenburg, Germany
    1002.4×
  136. 136ŁaskŁódź Voivodeship, Poland
    992.3×
  137. 137SzegedCsongrád, Hungary
    992.3×
  138. 138DěčínÚstí nad Labem Region, Czechia
    992.3×
  139. 139ManamaManama, Bahrain
    982.3×
  140. 139ZvolenBanská Bystrica Region, Slovakia
    982.3×
  141. 139KatowiceSilesia, Poland
    982.3×
  142. 139SalamancaGuanajuato, Mexico
    982.3×
  143. 143SzczecinWest Pomerania, Poland
    982.3×
  144. 144WarsawMazovia, Poland
    982.3×
  145. 144San Francisco TlalcilalcalpanMéxico, Mexico
    982.3×
  146. 144TemucoAraucania, Chile
    982.3×
  147. 144MonterreyNuevo León, Mexico
    982.3×
  148. 148TrnavaTrnava Region, Slovakia
    982.3×
  149. 148ŻywiecSilesia, Poland
    982.3×
  150. 150GdańskPomerania, Poland
    982.3×
  151. 151ZamośćLublin, Poland
    972.3×
  152. 151ĆuprijaCentral Serbia, Serbia
    972.3×
  153. 153Cluj-NapocaCluj County, Romania
    972.3×
  154. 153OlomoucOlomouc Region, Czechia
    972.3×
  155. 155WawerMazovia, Poland
    972.2×
  156. 155Roi EtRoi Et, Thailand
    972.2×
  157. 155ŻabbarĦaż-Żabbar, Malta
    972.2×
  158. 158Gorzów WielkopolskiLubusz, Poland
    962.2×
  159. 158LjubljanaLjubljana, Slovenia
    962.2×
  160. 160YangonYangon, Myanmar
    962.2×
  161. 160KoperUrban Municipality of Koper, Slovenia
    962.2×
  162. 160ChilliwackBritish Columbia, Canada
    962.2×
  163. 163JarosławSubcarpathia, Poland
    962.2×
  164. 163MostaIl-Mosta, Malta
    962.2×
  165. 163FutogVojvodina, Serbia
    962.2×
  166. 166NiskoSubcarpathia, Poland
    962.2×
  167. 166SenicaTrnava Region, Slovakia
    962.2×
  168. 168RēzekneRēzekne, Latvia
    962.2×
  169. 168Puerto AysénAysén, Chile
    962.2×
  170. 170RadomskoŁódź Voivodeship, Poland
    952.2×
  171. 171KaliszGreater Poland, Poland
    952.2×
  172. 172DębicaSubcarpathia, Poland
    942.2×
  173. 172TravnikFederation of B&H, Bosnia and Herzegovina
    942.2×
  174. 174GrajewoPodlasie, Poland
    942.2×
  175. 174WeißenfelsSaxony-Anhalt, Germany
    942.2×
  176. 174PłockMazovia, Poland
    942.2×
  177. 177La UniónLos Ríos Region, Chile
    932.1×
  178. 178PułtuskMazovia, Poland
    932.1×
  179. 179RadomMazovia, Poland
    932.1×
  180. 179BytówPomerania, Poland
    932.1×
  181. 181Nakhon RatchasimaNakhon Ratchasima, Thailand
    932.1×
  182. 181HandlováTrenčín Region, Slovakia
    932.1×
  183. 183EisenhüttenstadtBrandenburg, Germany
    922.1×
  184. 184TarnówLesser Poland, Poland
    922.1×
  185. 184EdinburgTexas, United States
    922.1×
  186. 186GuangzhouGuangdong, China
    912.1×
  187. 187GöttingenLower Saxony, Germany
    912.0×
  188. 187ToruńKujawsko-Pomorskie, Poland
    912.0×
  189. 187KościanGreater Poland, Poland
    912.0×
  190. 190Vranov nad TopľouPrešov Region, Slovakia
    912.0×
  191. 190Wan ChaiWan Chai, Hong Kong
    912.0×
  192. 192SofiaSofia-Capital, Bulgaria
    912.0×
  193. 192ObrenovacCentral Serbia, Serbia
    912.0×
  194. 194HumennéPrešov Region, Slovakia
    912.0×
  195. 194ShenyangLiaoning, China
    912.0×
  196. 194Hradec KrálovéHradec Králové Region, Czechia
    912.0×
  197. 197TeltowBrandenburg, Germany
    902.0×
  198. 197BratislavaBratislava Region, Slovakia
    902.0×
  199. 197UžiceCentral Serbia, Serbia
    902.0×
  200. 200Live OakTexas, United States
    902.0×

Top 200 of 2,060 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 1, 2024, smogrank.com/history/2024-04-01 (accessed 3 Oct 2026).

Download top 10 (PNG)

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