SmogRank / History / February 4, 2023

Most polluted cities on February 4, 2023

1,180 cities ranked by their average PM2.5 over the day; the worst was Paredes, Portugal, at 55.3 µg/m³. Each city's own local calendar day.

OpenAQ's archive, where our readings come from, has almost none for this day. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; many cities elsewhere are missing from this board, not clean. Why.

Bad-air episodes during February 4, 2023. All episodes.

← Paredes 55.3 µg/m³ 50 µg/m³15 WHO 24-hour guideline0
Every city ranked for February 4, 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. 1ParedesPorto, Portugal
    1503.7×
  2. 2West JordanUtah, United States
    1433.5×
  3. 3North OgdenUtah, United States
    1413.4×
  4. 4MillcreekUtah, United States
    1393.4×
  5. 5StrumicaStrumica, North Macedonia
    1192.8×
  6. 6Salt Lake CityUtah, United States
    1182.8×
  7. 6West Valley CityUtah, United States
    1182.8×
  8. 8Banja LukaSrpska, Bosnia and Herzegovina
    1122.7×
  9. 9MagnaUtah, United States
    1092.6×
  10. 10VigoGalicia, Spain
    1052.5×
  11. 11BailénAndalusia, Spain
    1032.4×
  12. 12AmoraSetúbal, Portugal
    982.3×
  13. 13AthensAttica, Greece
    982.3×
  14. 13SallanchesAuvergne-Rhône-Alpes, France
    982.3×
  15. 15PrilepPrilep, North Macedonia
    962.2×
  16. 16ValdemoroMadrid, Spain
    952.2×
  17. 17KoperUrban Municipality of Koper, Slovenia
    922.1×
  18. 18SkopjeGrad Skopje, North Macedonia
    912.0×
  19. 19AcharnésAttica, Greece
    902.0×
  20. 20NogalesSonora, Mexico
    881.9×
  21. 21GevgelijaGevgelija, North Macedonia
    881.9×
  22. 22KavadarciKavadarci, North Macedonia
    871.9×
  23. 23HerrimanUtah, United States
    861.9×
  24. 24SevillaAndalusia, Spain
    851.8×
  25. 25TooeleUtah, United States
    841.8×
  26. 26HernaniBasque Country, Spain
    831.8×
  27. 27LugoGalicia, Spain
    831.8×
  28. 28MariglianoCampania, Italy
    821.7×
  29. 29DaxNew Aquitaine, France
    801.6×
  30. 30TarbesOccitanie, France
    801.6×
  31. 31KorçëKorçë County, Albania
    791.6×
  32. 31PorsgrunnTelemark, Norway
    791.6×
  33. 33OviedoAsturias, Spain
    791.6×
  34. 33BihaćFederation of B&H, Bosnia and Herzegovina
    791.6×
  35. 33Jurupa ValleyCalifornia, United States
    791.6×
  36. 36Grants PassOregon, United States
    781.6×
  37. 37BufteaIlfov, Romania
    761.5×
  38. 37PontevedraGalicia, Spain
    761.5×
  39. 39TurinPiedmont, Italy
    761.5×
  40. 40MontaubanOccitanie, France
    761.5×
  41. 41PátraWest Greece, Greece
    761.5×
  42. 41CasamassimaApulia, Italy
    761.5×
  43. 43TetovoTetovo, North Macedonia
    751.5×
  44. 44TorreviejaValencia, Spain
    751.5×
  45. 45OtwockMazovia, Poland
    741.4×
  46. 45MarratxíBalearic Islands, Spain
    741.4×
  47. 47AsprópyrgosAttica, Greece
    741.4×
  48. 47SolingenNorth Rhine-Westphalia, Germany
    741.4×
  49. 47ManosqueProvence-Alpes-Côte d'Azur, France
    741.4×
  50. 50PesaroThe Marches, Italy
    731.4×
  51. 51NogalesArizona, United States
    721.4×
  52. 51YakimaWashington, United States
    721.4×
  53. 53GardanneProvence-Alpes-Côte d'Azur, France
    721.4×
  54. 54VoluntariIlfov, Romania
    721.4×
  55. 55PiraeusAttica, Greece
    721.4×
  56. 56OremUtah, United States
    711.3×
  57. 57PauNew Aquitaine, France
    711.3×
  58. 57ValladolidCastille and León, Spain
    711.3×
  59. 59OriaBasque Country, Spain
    711.3×
  60. 60GijónAsturias, Spain
    701.3×
  61. 60FerrolGalicia, Spain
    701.3×
  62. 62AnconaThe Marches, Italy
    701.3×
  63. 63Santiago de CompostelaGalicia, Spain
    701.3×
  64. 64LourdesOccitanie, France
    701.3×
  65. 65Popeşti-LeordeniIlfov, Romania
    691.3×
  66. 65SamaAsturias, Spain
    691.3×
  67. 65RiversideCalifornia, United States
    691.3×
  68. 68DrammenBuskerud, Norway
    691.3×
  69. 68ModugnoApulia, Italy
    691.3×
  70. 70HanfordCalifornia, United States
    691.3×
  71. 71OntarioCalifornia, United States
    691.2×
  72. 72MonacoMunicipality of Monaco, Monaco
    691.2×
  73. 73OurenseGalicia, Spain
    681.2×
  74. 73Nocera InferioreCampania, Italy
    681.2×
  75. 75HagenNorth Rhine-Westphalia, Germany
    681.2×
  76. 76PruszkówMazovia, Poland
    681.2×
  77. 77Falconara MarittimaThe Marches, Italy
    681.2×
  78. 78BucharestBucharest, Romania
    681.2×
  79. 79CannesProvence-Alpes-Côte d'Azur, France
    671.2×
  80. 80DallasTexas, United States
    671.2×
  81. 81RadomskoŁódź Voivodeship, Poland
    671.2×
  82. 81Arden-ArcadeCalifornia, United States
    671.2×
  83. 83PalmaBalearic Islands, Spain
    661.2×
  84. 83ToulouseOccitanie, France
    661.2×
  85. 83DurangoBasque Country, Spain
    661.2×
  86. 86CorroiosSetúbal, Portugal
    661.1×
  87. 86Aix-en-ProvenceProvence-Alpes-Côte d'Azur, France
    661.1×
  88. 88LeverkusenNorth Rhine-Westphalia, Germany
    661.1×
  89. 88ArteixoGalicia, Spain
    661.1×
  90. 90KochaniKochani, North Macedonia
    661.1×
  91. 90MonsWallonia, Belgium
    661.1×
  92. 92CartagenaMurcia, Spain
    651.1×
  93. 92AustinTexas, United States
    651.1×
  94. 94JaénAndalusia, Spain
    651.1×
  95. 95Ciudad RealCastille-La Mancha, Spain
    651.1×
  96. 95MóstolesMadrid, Spain
    651.1×
  97. 97GetxoBasque Country, Spain
    651.1×
  98. 98LüdenscheidNorth Rhine-Westphalia, Germany
    641.1×
  99. 99DuisburgNorth Rhine-Westphalia, Germany
    641.1×
  100. 99GrenobleAuvergne-Rhône-Alpes, France
    641.1×
  101. 99AnnecyAuvergne-Rhône-Alpes, France
    641.1×
  102. 99SalamancaCastille and León, Spain
    641.1×
  103. 103DattelnNorth Rhine-Westphalia, Germany
    641.1×
  104. 103NarónGalicia, Spain
    641.1×
  105. 103A CoruñaGalicia, Spain
    641.1×
  106. 106Collado-VillalbaMadrid, Spain
    641.1×
  107. 106Novo MestoUrban Municipality of Novo Mesto, Slovenia
    641.1×
  108. 106MostarFederation of B&H, Bosnia and Herzegovina
    641.1×
  109. 109Laudio / LlodioBasque Country, Spain
    631.1×
  110. 109SaginawTexas, United States
    631.1×
  111. 111OndaValencia, Spain
    631.0×
  112. 111AmorebietaBasque Country, Spain
    631.0×
  113. 111PhoenixArizona, United States
    631.0×
  114. 114OberhausenNorth Rhine-Westphalia, Germany
    631.0×
  115. 114BilbaoBasque Country, Spain
    631.0×
  116. 116HuelvaAndalusia, Spain
    631.0×
  117. 116WuppertalNorth Rhine-Westphalia, Germany
    631.0×
  118. 116KölnNorth Rhine-Westphalia, Germany
    631.0×
  119. 119BitolaBitola, North Macedonia
    631.0×
  120. 119DortmundNorth Rhine-Westphalia, Germany
    631.0×
  121. 121RadomMazovia, Poland
    631.0×
  122. 121ValenciaValencia, Spain
    631.0×
  123. 121CuencaCastille-La Mancha, Spain
    631.0×
  124. 121BeneventoCampania, Italy
    631.0×
  125. 125LisbonLisbon, Portugal
    621.0×
  126. 126CacémLisbon, Portugal
    621.0×
  127. 127ŻyrardówMazovia, Poland
    621.0×
  128. 127GostivarGostivar, North Macedonia
    621.0×
  129. 127ToledoCastille-La Mancha, Spain
    621.0×
  130. 127TrierRheinland-Pfalz, Germany
    621.0×
  131. 127Gasteiz / VitoriaBasque Country, Spain
    621.0×
  132. 127HamarInnlandet, Norway
    621.0×
  133. 127AcerraCampania, Italy
    621.0×
  134. 134East RidgeTennessee, United States
    621.0×
  135. 135GalatinaApulia, Italy
    621.0×
  136. 135AnaheimCalifornia, United States
    621.0×
  137. 137WawerMazovia, Poland
    611.0×
  138. 137HoustonTexas, United States
    611.0×
  139. 139Cava Dè TirreniCampania, Italy
    611.0×
  140. 139Fort WorthTexas, United States
    611.0×
  141. 141Mont-de-MarsanNew Aquitaine, France
    611.0×
  142. 141Los AngelesCalifornia, United States
    611.0×
  143. 141GreeleyColorado, United States
    611.0×
  144. 144IlindenIlinden, North Macedonia
    611.0×
  145. 144GranadaAndalusia, Spain
    611.0×
  146. 144VenloLimburg, The Netherlands
    611.0×
  147. 144ValenciennesHauts-de-France, France
    611.0×
  148. 144ZaragozaAragon, Spain
    611.0×
  149. 144La SpeziaLiguria, Italy
    611.0×
  150. 150SchwerteNorth Rhine-Westphalia, Germany
    611.0×
  151. 151Spišská Nová VesKošice Region, Slovakia
    610.9×
  152. 152BonnNorth Rhine-Westphalia, Germany
    600.9×
  153. 152BordeauxNew Aquitaine, France
    600.9×
  154. 152CosladaMadrid, Spain
    600.9×
  155. 155RatingenNorth Rhine-Westphalia, Germany
    600.9×
  156. 155DüsseldorfNorth Rhine-Westphalia, Germany
    600.9×
  157. 155MeylanAuvergne-Rhône-Alpes, France
    600.9×
  158. 155AlbertvilleAuvergne-Rhône-Alpes, France
    600.9×
  159. 155MadridMadrid, Spain
    600.9×
  160. 155CalexicoCalifornia, United States
    600.9×
  161. 155FresnoCalifornia, United States
    600.9×
  162. 162CorcoranCalifornia, United States
    600.9×
  163. 163ThessaloníkiCentral Macedonia, Greece
    600.9×
  164. 163WaregemFlanders, Belgium
    600.9×
  165. 163HattingenNorth Rhine-Westphalia, Germany
    600.9×
  166. 163Donostia / San SebastiánBasque Country, Spain
    600.9×
  167. 163KoprivnicaKoprivnica-Križevci, Croatia
    600.9×
  168. 163El CajonCalifornia, United States
    600.9×
  169. 163EllensburgWashington, United States
    600.9×
  170. 170San SeveroApulia, Italy
    600.9×
  171. 170DearbornMichigan, United States
    600.9×
  172. 170Las VegasNevada, United States
    600.9×
  173. 173SarpsborgØstfold, Norway
    590.9×
  174. 174EindhovenNorth Brabant, The Netherlands
    590.9×
  175. 174GelsenkirchenNorth Rhine-Westphalia, Germany
    590.9×
  176. 174EssenNorth Rhine-Westphalia, Germany
    590.9×
  177. 174StocktonCalifornia, United States
    590.9×
  178. 178GapProvence-Alpes-Côte d'Azur, France
    590.9×
  179. 178BakersfieldCalifornia, United States
    590.9×
  180. 178MercedCalifornia, United States
    590.9×
  181. 178RosevilleCalifornia, United States
    590.9×
  182. 182MenenFlanders, Belgium
    590.9×
  183. 182RoubaixHauts-de-France, France
    590.9×
  184. 182AvilésAsturias, Spain
    590.9×
  185. 182KourouGuyane, French Guiana
    590.9×
  186. 182Missouri CityTexas, United States
    590.9×
  187. 187Kempten (Allgäu)Bavaria, Germany
    580.9×
  188. 187LecceApulia, Italy
    580.9×
  189. 189MolFlanders, Belgium
    580.9×
  190. 189MechelenFlanders, Belgium
    580.9×
  191. 189GenkFlanders, Belgium
    580.9×
  192. 189WeselNorth Rhine-Westphalia, Germany
    580.9×
  193. 189SavonaLiguria, Italy
    580.9×
  194. 194LegionowoMazovia, Poland
    580.9×
  195. 194ZaventemFlanders, Belgium
    580.9×
  196. 194Sainte-Geneviève-des-BoisÎle-de-France, France
    580.9×
  197. 194NiceProvence-Alpes-Côte d'Azur, France
    580.9×
  198. 198LublinLublin, Poland
    580.9×
  199. 198ArucasCanary Islands, Spain
    580.9×
  200. 198CharleroiWallonia, Belgium
    580.9×

Top 200 of 1,180 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

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SmogRank, most polluted cities, PM2.5, February 4, 2023, smogrank.com/history/2023-02-04 (accessed 2 Oct 2026).

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