SmogRank / History / April 4, 2024

Most polluted cities on April 4, 2024

2,197 cities ranked by their average PM2.5 over the day; the worst was Piedras Negras, Mexico, at 645.0 µg/m³. Each city's own local calendar day.

← Piedras Negras 645.0 µg/m³ 600 µg/m³15 WHO 24-hour guideline
Every city ranked for April 4, 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. 1Piedras NegrasCoahuila, Mexico
    500+43.0×
  2. 2Mae SaiChiang Rai, Thailand
    25612.1×
  3. 3N'DjamenaN’Djaména, Chad
    2058.7×
  4. 4Vientianelow-cost sensorsVientiane Prefecture, Laos
    1998.3×
  5. 5PhayaoPhayao, Thailand
    1988.1×
  6. 6Chiang MaiChiang Mai, Thailand
    1968.0×
  7. 7NanNan, Thailand
    1927.6×
  8. 8Chiang RaiChiang Rai, Thailand
    1917.5×
  9. 9LamphunLamphun, Thailand
    1897.3×
  10. 10LampangLampang, Thailand
    1867.0×
  11. 11Kathmandulow-cost sensorsBagmati Province, Nepal
    1806.4×
  12. 12LoeiLoei, Thailand
    1725.7×
  13. 13UttaraditUttaradit, Thailand
    1665.2×
  14. 14Udon ThaniUdon Thani, Thailand
    1665.1×
  15. 15PhraePhrae, Thailand
    1655.0×
  16. 16KalasinKalasin, Thailand
    1624.7×
  17. 17SukhothaiSukhothai, Thailand
    1614.6×
  18. 18Lahorelow-cost sensorsPunjab, Pakistan
    1614.6×
  19. 19Kamphaeng PhetKamphaeng Phet, Thailand
    1604.6×
  20. 20CairoCairo, Egypt
    1604.6×
  21. 21Dhakalow-cost sensorsDhaka Division, Bangladesh
    1594.5×
  22. 22Nong Bua LamphuNong Bua Lamphu, Thailand
    1584.4×
  23. 23PhichitPhichit, Thailand
    1574.2×
  24. 24PhetchabunPhetchabun, Thailand
    1574.2×
  25. 25MukdahanMukdahan, Thailand
    1574.2×
  26. 26Khon KaenKhon Kaen, Thailand
    1544.0×
  27. 27KanchanaburiKanchanaburi, Thailand
    1533.9×
  28. 28Nakhon SawanNakhon Sawan, Thailand
    1533.9×
  29. 29Chai NatChai Nat, Thailand
    1523.8×
  30. 30BaghdadBaghdad, Iraq
    1523.8×
  31. 31Roi EtRoi Et, Thailand
    1513.7×
  32. 32ChaiyaphumChaiyaphum, Thailand
    1513.7×
  33. 33Lop BuriLopburi, Thailand
    1493.7×
  34. 34YasothonYasothon, Thailand
    1483.6×
  35. 35Sakon NakhonSakon Nakhon, Thailand
    1463.6×
  36. 36ShenyangLiaoning, China
    1423.5×
  37. 37AstanaAstana, Kazakhstan
    1393.4×
  38. 38JakartaJakarta, Indonesia
    1373.3×
  39. 39Nakhon RatchasimaNakhon Ratchasima, Thailand
    1363.3×
  40. 40RabinalBaja Verapaz, Guatemala
    1353.3×
  41. 41BeijingBeijing, China
    1333.2×
  42. 42Sing BuriSing Buri, Thailand
    1313.2×
  43. 43Suphan BuriSuphan Buri, Thailand
    1303.1×
  44. 44Ubon RatchathaniUbon Ratchathani, Thailand
    1293.1×
  45. 45Mae SotTak, Thailand
    1283.1×
  46. 46KolkataWest Bengal, India
    1263.1×
  47. 47Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1263.0×
  48. 48Amnat CharoenAmnat Charoen, Thailand
    1253.0×
  49. 49HanoiHanoi, Vietnam
    1233.0×
  50. 50HyderabadTelangana, India
    1212.9×
  51. 51DelhiDelhi, India
    1182.8×
  52. 52Karachilow-cost sensorsSindh, Pakistan
    1102.6×
  53. 53CelayaGuanajuato, Mexico
    1092.6×
  54. 54KigaliKigali, Rwanda
    1022.4×
  55. 55Hua HinPrachuap Khiri Khan, Thailand
    1002.3×
  56. 56Islamabadlow-cost sensorsIslamabad, Pakistan
    992.3×
  57. 57RatchaburiRatchaburi, Thailand
    992.3×
  58. 57Puente AltoSantiago Metropolitan, Chile
    992.3×
  59. 59CholulaPuebla, Mexico
    982.3×
  60. 60SaraburiSaraburi, Thailand
    952.2×
  61. 61DushanbeDushanbe, Tajikistan
    952.2×
  62. 62YesanChungcheongnam-do, South Korea
    942.2×
  63. 63Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya, Thailand
    942.1×
  64. 64NacimientoBiobio, Chile
    942.1×
  65. 65Buri RamBuriram, Thailand
    922.1×
  66. 66BelmopanCayo District, Belize
    922.1×
  67. 67OsornoLos Lagos Region, Chile
    922.1×
  68. 68SantiagoSantiago Metropolitan, Chile
    912.1×
  69. 69YangonYangon, Myanmar
    912.0×
  70. 70Nakhon PathomNakhon Pathom, Thailand
    912.0×
  71. 71FengshanTakao, Taiwan
    912.0×
  72. 72PhetchaburiPhetchaburi, Thailand
    902.0×
  73. 72PhuketPhuket, Thailand
    902.0×
  74. 74SalorTashkent Region, Uzbekistan
    902.0×
  75. 75TemucoAraucania, Chile
    892.0×
  76. 76KaohsiungTakao, Taiwan
    892.0×
  77. 77Si Maha PhotPrachin Buri, Thailand
    892.0×
  78. 78TainanTaiwan, Taiwan
    881.9×
  79. 79JeddahMecca Region, Saudi Arabia
    881.9×
  80. 80Si Sa KetSi Sa Ket, Thailand
    871.9×
  81. 80MagongTaiwan, Taiwan
    871.9×
  82. 80Taesal-liChungcheongnam-do, South Korea
    871.9×
  83. 83YongkangTaiwan, Taiwan
    871.9×
  84. 84ZhushanTaiwan, Taiwan
    871.9×
  85. 85RanongRanong province, Thailand
    861.9×
  86. 86ShanghaiShanghai, China
    861.9×
  87. 86QuinteroValparaiso, Chile
    861.9×
  88. 88Khlong LuangPathum Thani, Thailand
    861.9×
  89. 88TaichungTaiwan, Taiwan
    861.9×
  90. 88Hualien CityTaiwan, Taiwan
    861.9×
  91. 88Khlong Sam WaBangkok, Thailand
    861.9×
  92. 92Bang NaBangkok, Thailand
    851.8×
  93. 92HualquiBiobio, Chile
    851.8×
  94. 94BeigangTaiwan, Taiwan
    851.8×
  95. 95ChaozhouTaiwan, Taiwan
    851.8×
  96. 96Mueang NonthaburiNonthaburi, Thailand
    841.8×
  97. 96TaibaoTaiwan, Taiwan
    841.8×
  98. 96SeosanChungcheongnam-do, South Korea
    841.8×
  99. 99ErlunTaiwan, Taiwan
    841.8×
  100. 100Nong KhaemBangkok, Thailand
    831.8×
  101. 100Nakhon NayokNakhon Nayok, Thailand
    831.8×
  102. 100HsinchuTaiwan, Taiwan
    831.8×
  103. 103ErlinTaiwan, Taiwan
    831.8×
  104. 104ShulinTaipei, Taiwan
    831.8×
  105. 105Puerto MonttLos Lagos Region, Chile
    831.7×
  106. 106HongseongChungcheongnam-do, South Korea
    821.7×
  107. 106CuranilahueBiobio, Chile
    821.7×
  108. 108YilanTaiwan, Taiwan
    821.7×
  109. 109Prachin BuriPrachin Buri, Thailand
    821.7×
  110. 109Hwaseong-siGyeonggi-do, South Korea
    821.7×
  111. 109ToméBiobio, Chile
    821.7×
  112. 112MumbaiMaharashtra, India
    821.7×
  113. 113Puerto VarasLos Lagos Region, Chile
    811.7×
  114. 114Ban Samae DamBangkok, Thailand
    811.7×
  115. 114BuziTaiwan, Taiwan
    811.7×
  116. 116IncheonIncheon, South Korea
    811.7×
  117. 117Bang Khun ThianBangkok, Thailand
    801.7×
  118. 118BangkokBangkok, Thailand
    801.7×
  119. 118TaipeiTaiwan, Taiwan
    801.7×
  120. 118AlgecirasAndalusia, Spain
    801.7×
  121. 121PuliTaiwan, Taiwan
    801.6×
  122. 121ZhubeiTaiwan, Taiwan
    801.6×
  123. 121JenksOklahoma, United States
    801.6×
  124. 124TalaganteSantiago Metropolitan, Chile
    801.6×
  125. 125Bang KapiBangkok, Thailand
    791.6×
  126. 125YuanlinTaiwan, Taiwan
    791.6×
  127. 127ToufenTaiwan, Taiwan
    791.6×
  128. 128NantouTaiwan, Taiwan
    791.6×
  129. 129TaitungTaiwan, Taiwan
    791.6×
  130. 130Chiayi CityTaiwan, Taiwan
    781.6×
  131. 130Victoria de DurangoDurango, Mexico
    781.6×
  132. 132Addis AbabaAddis Ababa, Ethiopia
    781.6×
  133. 132XizhiTaipei, Taiwan
    781.6×
  134. 134La UniónLos Ríos Region, Chile
    771.6×
  135. 135Surat ThaniSurat Thani, Thailand
    771.5×
  136. 135Phra PradaengSamut Prakan, Thailand
    771.5×
  137. 135CoronelBiobio, Chile
    771.5×
  138. 135New Taipei CityTaipei, Taiwan
    771.5×
  139. 139DouliuTaiwan, Taiwan
    771.5×
  140. 139ZhudongTaiwan, Taiwan
    771.5×
  141. 139ChanghuaTaiwan, Taiwan
    771.5×
  142. 142JinchengFukien, Taiwan
    771.5×
  143. 142KeelungTaiwan, Taiwan
    771.5×
  144. 142IksanJeollabuk-do, South Korea
    771.5×
  145. 142TaoyuanTaiwan, Taiwan
    771.5×
  146. 146HengchunTaiwan, Taiwan
    761.5×
  147. 147Novi PazarCentral Serbia, Serbia
    761.5×
  148. 147CoyhaiqueAysén, Chile
    761.5×
  149. 149XinyingTaiwan, Taiwan
    761.5×
  150. 149Puerto AysénAysén, Chile
    761.5×
  151. 149Santa Anita - Los FicusLima region, Peru
    761.5×
  152. 152Khan Na YaoBangkok, Thailand
    761.5×
  153. 152Sai MaiBangkok, Thailand
    761.5×
  154. 154HualpénBiobio, Chile
    761.5×
  155. 155NeiliTaiwan, Taiwan
    751.5×
  156. 155GunsanJeollabuk-do, South Korea
    751.5×
  157. 155TalcahuanoBiobio, Chile
    751.5×
  158. 158Nong ChokBangkok, Thailand
    751.5×
  159. 158Ganghwa-gunIncheon, South Korea
    751.5×
  160. 160XizhouTaiwan, Taiwan
    751.5×
  161. 160Ansan-siGyeonggi-do, South Korea
    751.5×
  162. 162PohangGyeongsangbuk-do, South Korea
    741.4×
  163. 163WanjuJeollabuk-do, South Korea
    741.4×
  164. 163Gimpo-siGyeonggi-do, South Korea
    741.4×
  165. 165Şabāḩ as SālimMubārak al Kabīr, Kuwait
    741.4×
  166. 165DaxiTaiwan, Taiwan
    741.4×
  167. 165GangneungGangwon-do, South Korea
    741.4×
  168. 168MiaoliTaiwan, Taiwan
    741.4×
  169. 168WaegwanGyeongsangbuk-do, South Korea
    741.4×
  170. 170Ban Khlong PrawetBangkok, Thailand
    731.4×
  171. 170SokchoGangwon-do, South Korea
    731.4×
  172. 172ÖstersundJämtland, Sweden
    731.4×
  173. 173AshgabatAshgabat, Turkmenistan
    731.4×
  174. 173Samut SakhonSamut Sakhon, Thailand
    731.4×
  175. 173SeonghwanChungcheongnam-do, South Korea
    731.4×
  176. 173GimcheonGyeongsangbuk-do, South Korea
    731.4×
  177. 173San Pedro de la PazBiobio, Chile
    731.4×
  178. 178BuanJeollabuk-do, South Korea
    731.4×
  179. 178TulsaOklahoma, United States
    731.4×
  180. 180San CarlosÑuble, Chile
    731.4×
  181. 181Bucheon-siGyeonggi-do, South Korea
    721.4×
  182. 181RancaguaO'Higgins Region, Chile
    721.4×
  183. 181ConcónValparaiso, Chile
    721.4×
  184. 184Samut PrakanSamut Prakan, Thailand
    721.4×
  185. 184Ang Mo Kio New TownSingapore
    721.4×
  186. 186SarajevoFederation of B&H, Bosnia and Herzegovina
    721.4×
  187. 186Duque de CaxiasRio de Janeiro, Brazil
    721.4×
  188. 188Bang Bo DistrictSamut Prakan, Thailand
    721.4×
  189. 188Saphan SungBangkok, Thailand
    721.4×
  190. 190DziałdowoWarmia-Masuria, Poland
    721.3×
  191. 190GdyniaPomerania, Poland
    721.3×
  192. 192GyeongjuGyeongsangbuk-do, South Korea
    711.3×
  193. 193BoryeongChungcheongnam-do, South Korea
    711.3×
  194. 193Viña del MarValparaiso, Chile
    711.3×
  195. 193SalamancaGuanajuato, Mexico
    711.3×
  196. 196CopiapóAtacama, Chile
    701.3×
  197. 197AntofagastaAntofagasta, Chile
    701.3×
  198. 198Goyang-siGyeonggi-do, South Korea
    701.3×
  199. 198Ciudad ApodacaNuevo León, Mexico
    701.3×
  200. 200JumunjinGangwon-do, South Korea
    701.3×

Top 200 of 2,197 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 4, 2024, smogrank.com/history/2024-04-04 (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.