SmogRank / History / May 1, 2024

Most polluted cities on May 1, 2024

2,345 cities ranked by their average PM2.5 over the day; the worst was N'Djamena, Chad, at 162.0 µg/m³. Each city's own local calendar day.

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

← N'Djamena 162.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 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
    23710.8×
  2. 2OsornoLos Lagos Region, Chile
    1947.8×
  3. 3Kathmandulow-cost sensorsBagmati Province, Nepal
    1867.0×
  4. 4Puerto VarasLos Lagos Region, Chile
    1826.6×
  5. 5Mae SaiChiang Rai, Thailand
    1735.8×
  6. 6NacimientoBiobio, Chile
    1735.8×
  7. 7VillarricaAraucania, Chile
    1725.7×
  8. 8PhayaoPhayao, Thailand
    1715.6×
  9. 9NanNan, Thailand
    1695.4×
  10. 10Ubon RatchathaniUbon Ratchathani, Thailand
    1655.1×
  11. 11Chiang MaiChiang Mai, Thailand
    1634.9×
  12. 12Chiang RaiChiang Rai, Thailand
    1614.7×
  13. 13TlaquepaqueJalisco, Mexico
    1614.6×
  14. 14Puerto AysénAysén, Chile
    1604.5×
  15. 15Santa Anita - Los FicusLima region, Peru
    1594.5×
  16. 16UttaraditUttaradit, Thailand
    1594.5×
  17. 17CoyhaiqueAysén, Chile
    1574.3×
  18. 18LoeiLoei, Thailand
    1574.3×
  19. 19LampangLampang, Thailand
    1564.2×
  20. 20KalasinKalasin, Thailand
    1564.1×
  21. 21DelhiDelhi, India
    1544.0×
  22. 22Vientianelow-cost sensorsVientiane Prefecture, Laos
    1543.9×
  23. 23LamphunLamphun, Thailand
    1533.9×
  24. 24Lahorelow-cost sensorsPunjab, Pakistan
    1533.9×
  25. 25HualpénBiobio, Chile
    1533.9×
  26. 26PhraePhrae, Thailand
    1513.7×
  27. 27CuranilahueBiobio, Chile
    1473.6×
  28. 28Nong Bua LamphuNong Bua Lamphu, Thailand
    1473.6×
  29. 29Udon ThaniUdon Thani, Thailand
    1453.6×
  30. 30Kamphaeng PhetKamphaeng Phet, Thailand
    1453.6×
  31. 31SukhothaiSukhothai, Thailand
    1433.5×
  32. 32Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1373.4×
  33. 33San Salvador TizatlalliMéxico, Mexico
    1373.3×
  34. 34KolkataWest Bengal, India
    1363.3×
  35. 35PhetchabunPhetchabun, Thailand
    1363.3×
  36. 35MukdahanMukdahan, Thailand
    1363.3×
  37. 37Sakon NakhonSakon Nakhon, Thailand
    1353.3×
  38. 38PhichitPhichit, Thailand
    1343.3×
  39. 39Dhakalow-cost sensorsDhaka Division, Bangladesh
    1333.2×
  40. 40RatchaburiRatchaburi, Thailand
    1333.2×
  41. 41KanchanaburiKanchanaburi, Thailand
    1313.2×
  42. 42ValdiviaLos Ríos Region, Chile
    1313.2×
  43. 43TemucoAraucania, Chile
    1293.1×
  44. 44TalcahuanoBiobio, Chile
    1253.0×
  45. 45Khon KaenKhon Kaen, Thailand
    1243.0×
  46. 46PhetchaburiPhetchaburi, Thailand
    1233.0×
  47. 47Nakhon SawanNakhon Sawan, Thailand
    1222.9×
  48. 48Puerto MonttLos Lagos Region, Chile
    1212.9×
  49. 49ChaiyaphumChaiyaphum, Thailand
    1202.9×
  50. 50BaghdadBaghdad, Iraq
    1202.9×
  51. 51HyderabadTelangana, India
    1172.8×
  52. 52Nakhon PathomNakhon Pathom, Thailand
    1162.8×
  53. 53Sing BuriSing Buri, Thailand
    1162.8×
  54. 54Chai NatChai Nat, Thailand
    1152.7×
  55. 54Amnat CharoenAmnat Charoen, Thailand
    1152.7×
  56. 56Mae SotTak, Thailand
    1142.7×
  57. 56Hua HinPrachuap Khiri Khan, Thailand
    1142.7×
  58. 58San CarlosÑuble, Chile
    1142.7×
  59. 59Guatemala CityGuatemala, Guatemala
    1132.7×
  60. 60RabinalBaja Verapaz, Guatemala
    1112.6×
  61. 61MaputoMaputo City, Mozambique
    1092.6×
  62. 61Lop BuriLopburi, Thailand
    1092.6×
  63. 61Ban Samae DamBangkok, Thailand
    1092.6×
  64. 64TepicNayarit, Mexico
    1082.6×
  65. 65Suphan BuriSuphan Buri, Thailand
    1082.6×
  66. 65Nong KhaemBangkok, Thailand
    1082.6×
  67. 67BangkokBangkok, Thailand
    1072.5×
  68. 68AraoKumamoto, Japan
    1072.5×
  69. 69Samut SakhonSamut Sakhon, Thailand
    1052.5×
  70. 70Bang NaBangkok, Thailand
    1052.5×
  71. 71CairoCairo, Egypt
    1042.5×
  72. 72Ciudad Benito JuárezNuevo León, Mexico
    1032.4×
  73. 73JakartaJakarta, Indonesia
    1032.4×
  74. 74Roi EtRoi Et, Thailand
    1032.4×
  75. 75Mueang NonthaburiNonthaburi, Thailand
    1022.4×
  76. 76Los ÁngelesBiobio, Chile
    1022.4×
  77. 77HanoiHanoi, Vietnam
    1012.4×
  78. 78Phra PradaengSamut Prakan, Thailand
    992.3×
  79. 79Nakhon RatchasimaNakhon Ratchasima, Thailand
    982.3×
  80. 80YasothonYasothon, Thailand
    972.3×
  81. 81Lak SiBangkok, Thailand
    962.2×
  82. 82Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    962.2×
  83. 83CoronelBiobio, Chile
    962.2×
  84. 84LimaLima Province, Peru
    952.2×
  85. 85Ban Khlong PrawetBangkok, Thailand
    952.2×
  86. 86Bang KapiBangkok, Thailand
    942.2×
  87. 86ChillánÑuble, Chile
    942.2×
  88. 88Samut PrakanSamut Prakan, Thailand
    932.1×
  89. 89Khlong LuangPathum Thani, Thailand
    932.1×
  90. 90HualquiBiobio, Chile
    922.1×
  91. 91Addis AbabaAddis Ababa, Ethiopia
    922.1×
  92. 92ToméBiobio, Chile
    912.1×
  93. 93San Luis de la PazGuanajuato, Mexico
    912.0×
  94. 94PhuketPhuket, Thailand
    912.0×
  95. 95CeljeUrban Municipality of Celje, Slovenia
    902.0×
  96. 96Khan Na YaoBangkok, Thailand
    902.0×
  97. 97RanongRanong province, Thailand
    902.0×
  98. 98Kampalalow-cost sensorsCentral Region, Uganda
    902.0×
  99. 99SaraburiSaraburi, Thailand
    892.0×
  100. 100Ciudad ApodacaNuevo León, Mexico
    892.0×
  101. 101ConcepciónBiobio, Chile
    881.9×
  102. 102YangonYangon, Myanmar
    881.9×
  103. 103CelayaGuanajuato, Mexico
    881.9×
  104. 104ĆuprijaCentral Serbia, Serbia
    871.9×
  105. 104CuricóMaule Region, Chile
    871.9×
  106. 106Santa CatarinaNuevo León, Mexico
    861.9×
  107. 107ShanghaiShanghai, China
    861.8×
  108. 108RancaguaO'Higgins Region, Chile
    851.8×
  109. 109Si Sa KetSi Sa Ket, Thailand
    851.8×
  110. 110JeddahMecca Region, Saudi Arabia
    851.8×
  111. 111Nakhon NayokNakhon Nayok, Thailand
    841.8×
  112. 112São PauloSão Paulo, Brazil
    831.8×
  113. 113Abujalow-cost sensorsFCT, Nigeria
    821.7×
  114. 114SeonghwanChungcheongnam-do, South Korea
    821.7×
  115. 115MonterreyNuevo León, Mexico
    821.7×
  116. 116ChocopeLa Libertad, Peru
    801.7×
  117. 117BakuBaki, Azerbaijan
    801.7×
  118. 117Si Maha PhotPrachin Buri, Thailand
    801.7×
  119. 117Puente AltoSantiago Metropolitan, Chile
    801.7×
  120. 120Lat KrabangBangkok, Thailand
    801.6×
  121. 121CauquenesMaule Region, Chile
    801.6×
  122. 122Cadereyta JiménezNuevo León, Mexico
    791.6×
  123. 123Bang Bo DistrictSamut Prakan, Thailand
    791.6×
  124. 123ShenyangLiaoning, China
    791.6×
  125. 123León de los AldamaGuanajuato, Mexico
    791.6×
  126. 126KrefeldNorth Rhine-Westphalia, Germany
    791.6×
  127. 127CoquimboCoquimbo Region, Chile
    781.6×
  128. 127Jacobo HunterArequipa, Peru
    781.6×
  129. 129SalorTashkent Region, Uzbekistan
    781.6×
  130. 130MissionTexas, United States
    781.6×
  131. 131San Juan del RíoQuerétaro, Mexico
    781.6×
  132. 132SarajevoFederation of B&H, Bosnia and Herzegovina
    771.5×
  133. 132AricaArica y Parinacota Region, Chile
    771.5×
  134. 134PueblaPuebla, Mexico
    771.5×
  135. 134QuinteroValparaiso, Chile
    771.5×
  136. 134IrapuatoGuanajuato, Mexico
    771.5×
  137. 137Ciudad General EscobedoNuevo León, Mexico
    771.5×
  138. 138Islamabadlow-cost sensorsIslamabad, Pakistan
    761.5×
  139. 138DattelnNorth Rhine-Westphalia, Germany
    761.5×
  140. 140PattaniPattani, Thailand
    761.5×
  141. 140Ciudad JuárezChihuahua, Mexico
    761.5×
  142. 140EdinburgTexas, United States
    761.5×
  143. 143CopiapóAtacama, Chile
    751.5×
  144. 144LjubljanaLjubljana, Slovenia
    751.5×
  145. 145PyeongtaekGyeonggi-do, South Korea
    741.4×
  146. 145AmsterdamNorth Holland, The Netherlands
    741.4×
  147. 147Ulan BatorUlaanbaatar, Mongolia
    741.4×
  148. 147Villa Poeta José Gálvez BarrenecheaLima region, Peru
    741.4×
  149. 149StuttgartBaden-Wurttemberg, Germany
    741.4×
  150. 149SaalfeldThuringia, Germany
    741.4×
  151. 149San Pedro de la PazBiobio, Chile
    741.4×
  152. 152MariborUrban Municipality of Maribor, Slovenia
    741.4×
  153. 153AshgabatAshgabat, Turkmenistan
    741.4×
  154. 153Şabāḩ as SālimMubārak al Kabīr, Kuwait
    741.4×
  155. 153Velsen-ZuidNorth Holland, The Netherlands
    741.4×
  156. 156AntananarivoAnalamanga, Madagascar
    741.4×
  157. 156TangjinChungcheongnam-do, South Korea
    741.4×
  158. 158Eagle PassTexas, United States
    731.4×
  159. 159SatunSatun, Thailand
    731.4×
  160. 159Buri RamBuriram, Thailand
    731.4×
  161. 161QuillotaValparaiso, Chile
    731.4×
  162. 161AntofagastaAntofagasta, Chile
    731.4×
  163. 163DortmundNorth Rhine-Westphalia, Germany
    731.4×
  164. 164RengoO'Higgins Region, Chile
    731.4×
  165. 164La SerenaCoquimbo Region, Chile
    731.4×
  166. 166MaarssenUtrecht, The Netherlands
    721.4×
  167. 166BadhoevedorpNorth Holland, The Netherlands
    721.4×
  168. 166Ludwigshafen am RheinRheinland-Pfalz, Germany
    721.4×
  169. 169UnnaNorth Rhine-Westphalia, Germany
    721.4×
  170. 169GelsenkirchenNorth Rhine-Westphalia, Germany
    721.4×
  171. 171ŻabbarĦaż-Żabbar, Malta
    721.4×
  172. 171San Miguel de AllendeGuanajuato, Mexico
    721.4×
  173. 173EvergemFlanders, Belgium
    721.4×
  174. 173Novo MestoUrban Municipality of Novo Mesto, Slovenia
    721.4×
  175. 173TalcaMaule Region, Chile
    721.4×
  176. 176YesanChungcheongnam-do, South Korea
    721.3×
  177. 177Hat YaiSongkhla, Thailand
    711.3×
  178. 177Ban ChangRayong, Thailand
    711.3×
  179. 177Tepeji del Río de OcampoHidalgo, Mexico
    711.3×
  180. 180LochristiFlanders, Belgium
    711.3×
  181. 180Alto HospicioTarapacá, Chile
    711.3×
  182. 182ZaanstadNorth Holland, The Netherlands
    711.3×
  183. 182ReutlingenBaden-Wurttemberg, Germany
    711.3×
  184. 182OberhausenNorth Rhine-Westphalia, Germany
    711.3×
  185. 182SantiagoSantiago Metropolitan, Chile
    711.3×
  186. 186Wan ChaiWan Chai, Hong Kong
    711.3×
  187. 186Laem ChabangChon Buri, Thailand
    711.3×
  188. 186TalaganteSantiago Metropolitan, Chile
    711.3×
  189. 189TübingenBaden-Wurttemberg, Germany
    711.3×
  190. 190MedemblikNorth Holland, The Netherlands
    711.3×
  191. 190LudwigsburgBaden-Wurttemberg, Germany
    711.3×
  192. 192MannheimBaden-Wurttemberg, Germany
    701.3×
  193. 193GroningenGroningen, The Netherlands
    701.3×
  194. 193GreizThuringia, Germany
    701.3×
  195. 193VelserbroekNorth Holland, The Netherlands
    701.3×
  196. 196Surat ThaniSurat Thani, Thailand
    701.3×
  197. 196SurinSurin, Thailand
    701.3×
  198. 198IJsselsteinUtrecht, The Netherlands
    701.3×
  199. 198DuisburgNorth Rhine-Westphalia, Germany
    701.3×
  200. 200DamyangJeollanam-do, South Korea
    691.3×

Top 200 of 2,345 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, May 1, 2024, smogrank.com/history/2024-05-01 (accessed 3 Oct 2026).

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