SmogRank / History / July 23, 2024
Most polluted cities on July 23, 2024
2,266 cities ranked by their average PM2.5 over the day; the worst was Nacimiento, Chile, at 150.9 µg/m³. Each city's own local calendar day.
- North-western Canada and United States, July 202423 to 25 July 2024, 3 days17 cities140Calgary
- North-western United States and Canada, July 202420 to 24 July 2024, 5 days31 cities203Prince Albert
- Biobio, Chile, July 202420 to 23 July 2024, 4 days15 cities179Temuco
Bad-air episodes during July 23, 2024. All episodes.
← Nacimiento 150.9 µg/m³
100 µg/m³15 WHO 24-hour guideline
- 1NacimientoBiobio, Chile 22610.1×
- 2Los ÁngelesBiobio, Chile 2149.3×
- 3Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo 2119.1×
- 4HualpénBiobio, Chile 2068.7×
- 5CuranilahueBiobio, Chile 1937.7×
- 6ChillánÑuble, Chile 1877.1×
- 7VillarricaAraucania, Chile 1836.7×
- 7TemucoAraucania, Chile 1836.7×
- 9NampaIdaho, United States 1826.6×
- 10EdmontonAlberta, Canada 1796.4×
- 11HualquiBiobio, Chile 1786.3×
- 12MeridianIdaho, United States 1786.2×
- 13Fort McMurrayAlberta, Canada 1786.2×
- 14CoronelBiobio, Chile 1735.8×
- 15Santa Anita - Los FicusLima region, Peru 1735.8×
- 16Red DeerAlberta, Canada 1715.6×
- 17TalcahuanoBiobio, Chile 1634.8×
- 18TalcaMaule Region, Chile 1624.7×
- 19BoiseIdaho, United States 1614.7×
- 20Karachilow-cost sensorsSindh, Pakistan 1604.6×
- 21ToméBiobio, Chile 1604.5×
- 22St. AlbertAlberta, Canada 1594.4×
- 23ConcepciónBiobio, Chile 1554.0×
- 24CoyhaiqueAysén, Chile 1544.0×
- 25CuricóMaule Region, Chile 1533.9×
- 26Swift CurrentSaskatchewan, Canada 1523.8×
- 27RengoO'Higgins Region, Chile 1513.7×
- 28CalgaryAlberta, Canada 1513.7×
- 29ChiguayanteBiobio, Chile 1493.7×
- 30RancaguaO'Higgins Region, Chile 1483.6×
- 31AshgabatAshgabat, Turkmenistan 1433.5×
- 32Medicine HatAlberta, Canada 1343.3×
- 33ReginaSaskatchewan, Canada 1343.3×
- 34SantiagoSantiago Metropolitan, Chile 1333.2×
- 35ManamaManama, Bahrain 1323.2×
- 36LimaLima Province, Peru 1313.2×
- 37Lahorelow-cost sensorsPunjab, Pakistan 1293.1×
- 37La UniónLos Ríos Region, Chile 1293.1×
- 39SaskatoonSaskatchewan, Canada 1253.0×
- 40JakartaJakarta, Indonesia 1243.0×
- 41BeijingBeijing, China 1243.0×
- 42DelhiDelhi, India 1243.0×
- 43Puerto VarasLos Lagos Region, Chile 1222.9×
- 44ShenyangLiaoning, China 1202.9×
- 45AntananarivoAnalamanga, Madagascar 1172.8×
- 46Puente AltoSantiago Metropolitan, Chile 1142.7×
- 47San Francisco De BorjaLima region, Peru 1132.7×
- 48AltamontOregon, United States 1132.7×
- 49ValdiviaLos Ríos Region, Chile 1132.7×
- 50San Pedro de la PazBiobio, Chile 1102.6×
- 51AirdrieAlberta, Canada 1092.6×
- 52TalaganteSantiago Metropolitan, Chile 1062.5×
- 53QuillotaValparaiso, Chile 1052.5×
- 54LotaBiobio, Chile 1022.4×
- 55GilletteWyoming, United States 1022.4×
- 56CallaoCallao, Peru 1012.4×
- 57Islamabadlow-cost sensorsIslamabad, Pakistan 1012.4×
- 58OsornoLos Lagos Region, Chile 992.3×
- 59Prince AlbertSaskatchewan, Canada 992.3×
- 60LongmontColorado, United States 982.3×
- 61Rapid CitySouth Dakota, United States 972.2×
- 62ThorntonColorado, United States 942.1×
- 63Puerto AysénAysén, Chile 922.1×
- 64Asunciónlow-cost sensorsAsuncion, Paraguay 922.1×
- 64Villa Poeta José Gálvez BarrenecheaLima region, Peru 922.1×
- 66Jurong WestSingapore 912.0×
- 66MedfordOregon, United States 912.0×
- 68Colorado SpringsColorado, United States 892.0×
- 69QuilpuéValparaiso, Chile 892.0×
- 70Kampalalow-cost sensorsCentral Region, Uganda 892.0×
- 70Shakaskraallow-cost sensorsKwaZulu-Natal, South Africa 892.0×
- 70Grants PassOregon, United States 892.0×
- 73AshlandOregon, United States 881.9×
- 74Ang Mo Kio New TownSingapore 881.9×
- 75QuinteroValparaiso, Chile 871.9×
- 76Ken CarylColorado, United States 861.9×
- 77Fort CollinsColorado, United States 851.8×
- 78CheyenneWyoming, United States 851.8×
- 79SarajevoFederation of B&H, Bosnia and Herzegovina 851.8×
- 80GreeleyColorado, United States 841.8×
- 81BillingsMontana, United States 841.8×
- 82AricaArica y Parinacota Region, Chile 831.7×
- 83CasperWyoming, United States 821.7×
- 83SheridanWyoming, United States 821.7×
- 85Addis AbabaAddis Ababa, Ethiopia 821.7×
- 85ChocopeLa Libertad, Peru 821.7×
- 87MaputoMaputo City, Mozambique 811.7×
- 87Nong KhaemBangkok, Thailand 811.7×
- 89AberdeenSouth Dakota, United States 811.7×
- 89Great FallsMontana, United States 811.7×
- 89Lat KrabangBangkok, Thailand 811.7×
- 92DenverColorado, United States 801.6×
- 93ŌtsukiYamanashi, Japan 791.6×
- 94MissoulaMontana, United States 791.6×
- 95Ulu BedokSingapore 781.6×
- 96Viña del MarValparaiso, Chile 781.6×
- 97Debrecenlow-cost sensorsHajdú-Bihar, Hungary 771.6×
- 97GotembaShizuoka, Japan 771.6×
- 99Puerto MonttLos Lagos Region, Chile 771.5×
- 99LittletonColorado, United States 771.5×
- 101KanchanaburiKanchanaburi, Thailand 771.5×
- 101DushanbeDushanbe, Tajikistan 771.5×
- 101ConcónValparaiso, Chile 771.5×
- 104Bang NaBangkok, Thailand 771.5×
- 105Jacobo HunterArequipa, Peru 761.5×
- 106Ciudad Benito JuárezNuevo León, Mexico 761.5×
- 107WatertownSouth Dakota, United States 761.5×
- 108NakatsuOita, Japan 761.5×
- 109MillcreekUtah, United States 751.5×
- 109LaramieWyoming, United States 751.5×
- 111Rock SpringsWyoming, United States 751.5×
- 112Prince GeorgeBritish Columbia, Canada 751.5×
- 113LethbridgeAlberta, Canada 741.4×
- 114AsprópyrgosAttica, Greece 741.4×
- 115Khan Na YaoBangkok, Thailand 731.4×
- 116Queenstown Estatelow-cost sensorsSingapore 731.4×
- 117ChimboteAncash, Peru 731.4×
- 118Phra PradaengSamut Prakan, Thailand 731.4×
- 118GyöngyösHeves County, Hungary 731.4×
- 118Franklin ParkIllinois, United States 731.4×
- 121LewistonIdaho, United States 721.4×
- 122UžiceCentral Serbia, Serbia 721.4×
- 122OremUtah, United States 721.4×
- 124BoulderColorado, United States 721.4×
- 125Samut SakhonSamut Sakhon, Thailand 721.3×
- 126ŌitaOita, Japan 711.3×
- 126Falconara MarittimaThe Marches, Italy 711.3×
- 126AyaseKanagawa, Japan 711.3×
- 126YufuOita, Japan 711.3×
- 130CaryIllinois, United States 711.3×
- 131BountifulUtah, United States 711.3×
- 132MiskolcBorsod-Abaúj-Zemplén, Hungary 711.3×
- 133AiharaKanagawa, Japan 701.3×
- 133TimaruCanterbury, New Zealand 701.3×
- 133Salt Lake CityUtah, United States 701.3×
- 136Columbialow-cost sensorsMissouri, United States 701.3×
- 136OregonOhio, United States 701.3×
- 138SunnysideWashington, United States 701.3×
- 138ChikuseiIbaraki, Japan 701.3×
- 140BangkokBangkok, Thailand 701.3×
- 140West Valley CityUtah, United States 701.3×
- 142Samut PrakanSamut Prakan, Thailand 701.3×
- 143Nakhon RatchasimaNakhon Ratchasima, Thailand 691.3×
- 143Nakhon PathomNakhon Pathom, Thailand 691.3×
- 143MarugameKagawa, Japan 691.3×
- 146BucharestBucharest, Romania 691.3×
- 146Novi PazarCentral Serbia, Serbia 691.3×
- 146SaraburiSaraburi, Thailand 691.3×
- 149Şabāḩ as SālimMubārak al Kabīr, Kuwait 691.3×
- 149MiyazuKyoto, Japan 691.3×
- 149Guatemala CityGuatemala, Guatemala 691.3×
- 149HerrimanUtah, United States 691.3×
- 149AshburtonCanterbury, New Zealand 691.3×
- 154YauriCuzco Department, Peru 691.2×
- 154BuzenFukuoka, Japan 691.2×
- 156KofuYamanashi, Japan 691.2×
- 156Coeur d'AleneIdaho, United States 691.2×
- 156MoscowIdaho, United States 691.2×
- 159RochesterMinnesota, United States 691.2×
- 159CranbrookBritish Columbia, Canada 691.2×
- 161HelenaMontana, United States 681.2×
- 161Grande PrairieAlberta, Canada 681.2×
- 163NorthbrookIllinois, United States 681.2×
- 163PocatelloIdaho, United States 681.2×
- 165Tottori-shiTottori, Japan 681.2×
- 165North OgdenUtah, United States 681.2×
- 167ObamaFukui, Japan 681.2×
- 168KandaFukuoka, Japan 671.2×
- 168AntofagastaAntofagasta, Chile 671.2×
- 170BeppuOita, Japan 671.2×
- 170Grand JunctionColorado, United States 671.2×
- 172MinamirinkanKanagawa, Japan 671.2×
- 172AyabeKyoto, Japan 671.2×
- 172KalamazooMichigan, United States 671.2×
- 172ReddingCalifornia, United States 671.2×
- 176N'DjamenaN’Djaména, Chad 671.2×
- 177GostivarGostivar, North Macedonia 671.2×
- 177West JordanUtah, United States 671.2×
- 179ZemunCentral Serbia, Serbia 661.2×
- 179ZentsujichóKagawa, Japan 661.2×
- 179TakasakiGunma, Japan 661.2×
- 179OdawaraKanagawa, Japan 661.2×
- 179MinawaKanagawa, Japan 661.2×
- 179SusonoShizuoka, Japan 661.2×
- 179MatsusakaMie, Japan 661.2×
- 186Bang Bo DistrictSamut Prakan, Thailand 661.1×
- 186WoodlandsSingapore 661.1×
- 186RedfordMichigan, United States 661.1×
- 186El PasoTexas, United States 661.1×
- 190KraljevoCentral Serbia, Serbia 661.1×
- 190MankatoMinnesota, United States 661.1×
- 190West FargoNorth Dakota, United States 661.1×
- 193BitolaBitola, North Macedonia 661.1×
- 193Dhakalow-cost sensorsDhaka Division, Bangladesh 661.1×
- 193NiihamaEhime, Japan 661.1×
- 193FukuchiyamaKyoto, Japan 661.1×
- 193Alto HospicioTarapacá, Chile 661.1×
- 193West MifflinPennsylvania, United States 661.1×
- 193BrookingsSouth Dakota, United States 661.1×
- 200HadanoKanagawa, Japan 661.1×
Top 200 of 2,266 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, July 23, 2024, smogrank.com/history/2024-07-23 (accessed 3 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.