SmogRank / History / October 2026
Most polluted cities, October 2026
1,630 cities ranked by their average PM2.5 so far (1 of 31 days); the worst was Saint-Louis, Senegal, at 151.2 µg/m³. A city needs measurements on 70% of the days to be ranked.
← Saint-Louis 151.2 µg/m³
100 µg/m³0
- 1Saint-Louislow-cost sensorsSaint-Louis, Senegal 226
- 2Gujranwalalow-cost sensorsPunjab, Pakistan 185
- 3Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan 171
- 4Dhakalow-cost sensorsDhaka Division, Bangladesh 169
- 5Lahorelow-cost sensorsPunjab, Pakistan 162
- 6Faisalabadlow-cost sensorsPunjab, Pakistan 154
- 7Sialkotlow-cost sensorsPunjab, Pakistan 152
- 8VillarricaAraucania, Chile 152
- 9SzegedCsongrád, Hungary 150
- 9Jammulow-cost sensorsJammu and Kashmir, India 150
- 11Kuala LumpurKuala Lumpur, Malaysia 150
- 12Multanlow-cost sensorsPunjab, Pakistan 146
- 13Rahim Yar Khanlow-cost sensorsPunjab, Pakistan 144
- 14Butwāllow-cost sensorsLumbini Province, Nepal 134
- 15Kinshasalow-cost sensorsKinshasa, Democratic Republic of the Congo 133
- 16Tabananlow-cost sensorsBali, Indonesia 131
- 17Ubudlow-cost sensorsBali, Indonesia 126
- 18ValdiviaLos Ríos Region, Chile 125
- 19Alipurlow-cost sensorsIslamabad, Pakistan 124
- 20Rawalpindilow-cost sensorsPunjab, Pakistan 124
- 20HualpénBiobio, Chile 124
- 22Ban ChangRayong, Thailand 119
- 23Dalunglow-cost sensorsBali, Indonesia 116
- 24Singaporelow-cost sensorsSingapore 115
- 25Queenstown Estatelow-cost sensorsSingapore 114
- 26TzaneenLimpopo, South Africa 113
- 27CoyhaiqueAysén, Chile 112
- 28Islamabadlow-cost sensorsIslamabad, Pakistan 110
- 29Phuntsholinglow-cost sensorsChukha, Bhutan 109
- 30Denpasarlow-cost sensorsBali, Indonesia 107
- 31Bahawalpurlow-cost sensorsPunjab, Pakistan 107
- 32ChillánÑuble, Chile 102
- 33Iloilolow-cost sensorsWestern Visayas, Philippines 101
- 34Murreelow-cost sensorsPunjab, Pakistan 101
- 35Mzuzulow-cost sensorsNorthern Region, Malawi 99
- 36Quezon Citylow-cost sensorsNational Capital Region, Philippines 99
- 37San Luis PotosíSan Luis Potosí, Mexico 98
- 38Kathmandulow-cost sensorsBagmati Province, Nepal 98
- 39TalcahuanoBiobio, Chile 94
- 40TalcaMaule Region, Chile 94
- 41Kampalalow-cost sensorsCentral Region, Uganda 92
- 42OsornoLos Lagos Region, Chile 92
- 43CuranilahueBiobio, Chile 91
- 44ChennaiTamil Nadu, India 90
- 45Naucalpan de JuárezMéxico, Mexico 89
- 46TemucoAraucania, Chile 89
- 47PrijedorSrpska, Bosnia and Herzegovina 89
- 48Dubailow-cost sensorsDubai, United Arab Emirates 87
- 49AostaAosta Valley, Italy 87
- 50Mexico CityMexico City, Mexico 86
- 51Quettalow-cost sensorsBalochistan, Pakistan 85
- 52San Pedro Sulalow-cost sensorsCortés Department, Honduras 84
- 53Lilongwelow-cost sensorsCentral Region, Malawi 84
- 53SantiagoSantiago Metropolitan, Chile 84
- 53LinaresMaule Region, Chile 84
- 56Ibadanlow-cost sensorsOyo State, Nigeria 84
- 57Vientianelow-cost sensorsVientiane Prefecture, Laos 83
- 57San CarlosÑuble, Chile 83
- 59VereenigingGauteng, South Africa 83
- 60Lagoslow-cost sensorsLagos, Nigeria 82
- 61CauquenesMaule Region, Chile 81
- 62Ciudad NezahualcoyotlMéxico, Mexico 81
- 63KikindaVojvodina, Serbia 80
- 64Karachilow-cost sensorsSindh, Pakistan 80
- 65Khon KaenKhon Kaen, Thailand 80
- 65HualquiBiobio, Chile 80
- 67RancaguaO'Higgins Region, Chile 80
- 68Khan Na YaoBangkok, Thailand 79
- 69Bang Pakonglow-cost sensorsChachoengsao, Thailand 78
- 70Puente AltoSantiago Metropolitan, Chile 78
- 71CalexicoCalifornia, United States 77
- 72CoronelBiobio, Chile 77
- 73DushanbeDushanbe, Tajikistan 77
- 73BellinzonaTicino, Switzerland 77
- 75La UniónLos Ríos Region, Chile 76
- 76Bang NaBangkok, Thailand 76
- 77Khlong Sam WaBangkok, Thailand 75
- 78Los ÁngelesBiobio, Chile 75
- 79NurembergBavaria, Germany 74
- 79LandshutBavaria, Germany 74
- 79San Salvador TizatlalliMéxico, Mexico 74
- 82RengoO'Higgins Region, Chile 74
- 83Jurupa ValleyCalifornia, United States 73
- 83Lat KrabangBangkok, Thailand 73
- 85SasolburgFree State, South Africa 73
- 85Copenhagenlow-cost sensorsCapital Region, Denmark 73
- 85CopiapóAtacama, Chile 73
- 85TijuanaBaja California, Mexico 73
- 89KalasinKalasin, Thailand 73
- 89Sukutalow-cost sensorsWestern, Gambia 73
- 91Zagreblow-cost sensorsZagreb, Croatia 73
- 91Puerto MonttLos Lagos Region, Chile 73
- 93San Francisco TlalcilalcalpanMéxico, Mexico 72
- 94Târgu Mureşlow-cost sensorsMureș County, Romania 72
- 94Ban Talat BuengChon Buri, Thailand 72
- 94Doualalow-cost sensorsLittoral, Cameroon 72
- 94CuricóMaule Region, Chile 72
- 98Zombalow-cost sensorsSouthern Region, Malawi 72
- 99Puerto AysénAysén, Chile 72
- 99AntofagastaAntofagasta, Chile 72
- 101NarathiwatNarathiwat, Thailand 71
- 101Hat YaiSongkhla, Thailand 71
- 103Lak SiBangkok, Thailand 71
- 104Ban Samae DamBangkok, Thailand 71
- 104Los AngelesCalifornia, United States 71
- 104San Pedro de la PazBiobio, Chile 71
- 107YalaYala, Thailand 71
- 107HanfordCalifornia, United States 71
- 109PattaniPattani, Thailand 71
- 110TratTrat, Thailand 70
- 110UžiceCentral Serbia, Serbia 70
- 110ConcónValparaiso, Chile 70
- 113KanchanaburiKanchanaburi, Thailand 70
- 114Hyderabadlow-cost sensorsSindh, Pakistan 70
- 114BetongYala, Thailand 70
- 114Wheatonlow-cost sensorsIllinois, United States 70
- 117Phra PradaengSamut Prakan, Thailand 70
- 117Khlong LuangPathum Thani, Thailand 70
- 117ChanthaburiChanthaburi, Thailand 70
- 117MunichBavaria, Germany 70
- 121Istanbullow-cost sensorsIstanbul, Turkey 69
- 121La SerenaCoquimbo Region, Chile 69
- 123SmederevoCentral Serbia, Serbia 69
- 123Banja LukaSrpska, Bosnia and Herzegovina 69
- 125RayongRayong, Thailand 69
- 125Temalow-cost sensorsGreater Accra, Ghana 69
- 127PhuketPhuket, Thailand 68
- 127AugsburgBavaria, Germany 68
- 127TalaganteSantiago Metropolitan, Chile 68
- 127MexicaliBaja California, Mexico 68
- 131LeslieMpumalanga, South Africa 68
- 132CoquimboCoquimbo Region, Chile 68
- 133JumillaMurcia, Spain 68
- 133ChiguayanteBiobio, Chile 68
- 135SuceavaSuceava, Romania 68
- 135Roi EtRoi Et, Thailand 68
- 135Bang KapiBangkok, Thailand 68
- 135Ashaimanlow-cost sensorsGreater Accra, Ghana 68
- 139MukdahanMukdahan, Thailand 67
- 140FresnoCalifornia, United States 67
- 141Maha SarakhamMaha Sarakham, Thailand 67
- 141Wake Forestlow-cost sensorsNorth Carolina, United States 67
- 141WhittierCalifornia, United States 67
- 144Nong ChokBangkok, Thailand 66
- 144Amnat CharoenAmnat Charoen, Thailand 66
- 146ToméBiobio, Chile 66
- 146Ann Arborlow-cost sensorsMichigan, United States 66
- 148LotaBiobio, Chile 66
- 148CorcoranCalifornia, United States 66
- 150IngolstadtBavaria, Germany 66
- 150GyálPest County, Hungary 66
- 150FontanaCalifornia, United States 66
- 153Samut SakhonSamut Sakhon, Thailand 66
- 153BangkokBangkok, Thailand 66
- 153San DiegoCalifornia, United States 66
- 156LudwigsburgBaden-Wurttemberg, Germany 66
- 157TrangTrang, Thailand 65
- 157Mae SaiChiang Rai, Thailand 65
- 157Laem ChabangChon Buri, Thailand 65
- 157BiellaPiedmont, Italy 65
- 161BakuBaki, Azerbaijan 65
- 161Abujalow-cost sensorsFCT, Nigeria 65
- 161Viña del MarValparaiso, Chile 65
- 161QuinteroValparaiso, Chile 65
- 161OregonOhio, United States 65
- 161Mission ViejoCalifornia, United States 65
- 167PhatthalungPhatthalung, Thailand 65
- 167Nakhon RatchasimaNakhon Ratchasima, Thailand 65
- 167AnconaThe Marches, Italy 65
- 167QuilpuéValparaiso, Chile 65
- 167QuillotaValparaiso, Chile 65
- 172Nong KhaemBangkok, Thailand 65
- 173Novi PazarCentral Serbia, Serbia 64
- 173HeilbronnBaden-Wurttemberg, Germany 64
- 173ChattanoogaTennessee, United States 64
- 176SaraburiSaraburi, Thailand 64
- 176Ban Khlong PrawetBangkok, Thailand 64
- 176TraunreutBavaria, Germany 64
- 179NanNan, Thailand 64
- 179NauenBrandenburg, Germany 64
- 181UttaraditUttaradit, Thailand 64
- 181Nepeanlow-cost sensorsOntario, Canada 64
- 181Bueng KumBangkok, Thailand 64
- 184YangsanGyeongsangnam-do, South Korea 64
- 184Winterthurlow-cost sensorsZurich, Switzerland 64
- 186BurghausenBavaria, Germany 63
- 186Fort WayneIndiana, United States 63
- 186LimaOhio, United States 63
- 189Samut PrakanSamut Prakan, Thailand 63
- 189TaichungTaiwan, Taiwan 63
- 189Říčanylow-cost sensorsCentral Bohemia, Czechia 63
- 189Le LamentinMartinique, Martinique 63
- 189Adentalow-cost sensorsGreater Accra, Ghana 63
- 194Ubon RatchathaniUbon Ratchathani, Thailand 63
- 194Yaoundélow-cost sensorsCentre, Cameroon 63
- 194NeubrandenburgMecklenburg-Vorpommern, Germany 63
- 194Alto HospicioTarapacá, Chile 63
- 194PortsmouthOhio, United States 63
- 199MurciaMurcia, Spain 63
- 199FriedrichshafenBaden-Wurttemberg, Germany 63
Top 200 of 1,630 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
By country
Austria 16Belgium 29Bosnia and Herzegovina 4Brazil 6Bulgaria 9Canada 86Chile 40Estonia 4Finland 10France 91Germany 161Ghana 4Greece 3Hong Kong 9Hungary 10Indonesia 4Ireland 24Italy 5Japan 28Kazakhstan 5Latvia 4Lebanon 3Malawi 4Malta 4Mexico 33Montenegro 5New Zealand 3Nigeria 3North Macedonia 11Pakistan 15Portugal 3Romania 20Senegal 4Serbia 8Slovakia 22Slovenia 8South Africa 34South Korea 133Spain 60Sweden 4Switzerland 3Thailand 75The Netherlands 32United Kingdom 5United States 535
Ranked cities in each country, October 2026.
Use this board
SmogRank, most polluted cities, PM2.5, October 2026 (so far), smogrank.com/history/2026-10 (accessed 2 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.