SmogRank / History / May 18, 2024
Most polluted cities on May 18, 2024
2,316 cities ranked by their average PM2.5 over the day; the worst was Coyhaique, Chile, at 229.0 µg/m³. Each city's own local calendar day.
- Taiwan, May 202418 to 20 May 2024, 3 days16 cities40Tainan
- South-western Chile, May 202414 to 19 May 2024, 6 days19 cities275Osorno
- Belgium and Germany, May 202418 to 19 May 2024, 2 days12 cities33Grimbergen
Bad-air episodes during May 18, 2024. All episodes.
← Coyhaique 229.0 µg/m³
200 µg/m³15 WHO 24-hour guideline
- 1CoyhaiqueAysén, Chile 30815.3×
- 2N'DjamenaN’Djaména, Chad 28814.2×
- 3San CarlosÑuble, Chile 25411.9×
- 4OsornoLos Lagos Region, Chile 24011.0×
- 5NacimientoBiobio, Chile 22610.1×
- 6Puerto VarasLos Lagos Region, Chile 22510.0×
- 7Puerto MonttLos Lagos Region, Chile 2139.2×
- 8HualpénBiobio, Chile 2109.0×
- 9ChillánÑuble, Chile 2058.6×
- 10CoronelBiobio, Chile 2008.3×
- 11CuranilahueBiobio, Chile 1978.1×
- 12Santa Anita - Los FicusLima region, Peru 1937.7×
- 13VillarricaAraucania, Chile 1937.7×
- 14TalcahuanoBiobio, Chile 1887.2×
- 15TemucoAraucania, Chile 1867.0×
- 16La UniónLos Ríos Region, Chile 1836.7×
- 17Los ÁngelesBiobio, Chile 1796.4×
- 18TalcaMaule Region, Chile 1776.1×
- 19DelhiDelhi, India 1745.9×
- 20CuricóMaule Region, Chile 1725.7×
- 21BaghdadBaghdad, Iraq 1705.5×
- 22CauquenesMaule Region, Chile 1705.5×
- 23Kathmandulow-cost sensorsBagmati Province, Nepal 1705.5×
- 24Lahorelow-cost sensorsPunjab, Pakistan 1655.1×
- 25CairoCairo, Egypt 1614.7×
- 26RengoO'Higgins Region, Chile 1604.5×
- 27BeijingBeijing, China 1594.5×
- 28ChiguayanteBiobio, Chile 1554.1×
- 29CatañoCataño, Puerto Rico 1533.9×
- 30RancaguaO'Higgins Region, Chile 1523.8×
- 31San Pedro de la PazBiobio, Chile 1513.7×
- 32ToméBiobio, Chile 1513.7×
- 33Puerto AysénAysén, Chile 1463.6×
- 34TalaganteSantiago Metropolitan, Chile 1453.6×
- 35SantiagoSantiago Metropolitan, Chile 1383.4×
- 36Şabāḩ as SālimMubārak al Kabīr, Kuwait 1353.3×
- 37QuillotaValparaiso, Chile 1313.2×
- 38QuilpuéValparaiso, Chile 1313.2×
- 39ManamaManama, Bahrain 1273.1×
- 40BelmopanCayo District, Belize 1263.0×
- 41Dhakalow-cost sensorsDhaka Division, Bangladesh 1202.9×
- 42San Pawl il-BaħarSaint Paul’s Bay, Malta 1182.8×
- 43MostaIl-Mosta, Malta 1172.8×
- 44ŻabbarĦaż-Żabbar, Malta 1152.7×
- 45Puente AltoSantiago Metropolitan, Chile 1132.7×
- 46VallettaValletta, Malta 1112.6×
- 47NanNan, Thailand 1102.6×
- 48QuinteroValparaiso, Chile 1052.5×
- 49ValdiviaLos Ríos Region, Chile 972.2×
- 50IndioCalifornia, United States 962.2×
- 51San Luis de la PazGuanajuato, Mexico 962.2×
- 52Quezon Citylow-cost sensorsNational Capital Region, Philippines 962.2×
- 53MumbaiMaharashtra, India 952.2×
- 53CelayaGuanajuato, Mexico 952.2×
- 55Nakhon RatchasimaNakhon Ratchasima, Thailand 942.2×
- 56Addis AbabaAddis Ababa, Ethiopia 922.1×
- 57GuangzhouGuangdong, China 912.0×
- 58HasseltFlanders, Belgium 892.0×
- 59Islamabadlow-cost sensorsIslamabad, Pakistan 881.9×
- 60PueblaPuebla, Mexico 881.9×
- 60ConcónValparaiso, Chile 881.9×
- 62HanoiHanoi, Vietnam 881.9×
- 62BrusselsBrussels Capital, Belgium 881.9×
- 64ZaventemFlanders, Belgium 871.9×
- 65KolkataWest Bengal, India 871.9×
- 65GrimbergenFlanders, Belgium 871.9×
- 67Viña del MarValparaiso, Chile 871.9×
- 68AarschotFlanders, Belgium 861.9×
- 69AthensAttica, Greece 861.9×
- 70MukdahanMukdahan, Thailand 861.9×
- 71YongkangTaiwan, Taiwan 861.8×
- 71TainanTaiwan, Taiwan 861.8×
- 73Heroica MatamorosTamaulipas, Mexico 851.8×
- 74HouthalenFlanders, Belgium 851.8×
- 75KanchanaburiKanchanaburi, Thailand 851.8×
- 75Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan 851.8×
- 75BergheimNorth Rhine-Westphalia, Germany 851.8×
- 78ChaozhouTaiwan, Taiwan 841.8×
- 79MolFlanders, Belgium 841.8×
- 80UttaraditUttaradit, Thailand 841.8×
- 81Abujalow-cost sensorsFCT, Nigeria 841.8×
- 81La SerenaCoquimbo Region, Chile 841.8×
- 83ErlunTaiwan, Taiwan 831.8×
- 84BeigangTaiwan, Taiwan 831.8×
- 84ZhushanTaiwan, Taiwan 831.8×
- 86CoquimboCoquimbo Region, Chile 831.8×
- 87Chai NatChai Nat, Thailand 831.7×
- 88DouliuTaiwan, Taiwan 821.7×
- 89JülichNorth Rhine-Westphalia, Germany 821.7×
- 89MissionTexas, United States 821.7×
- 91Vientianelow-cost sensorsVientiane Prefecture, Laos 821.7×
- 92Chiayi CityTaiwan, Taiwan 811.7×
- 93Mae SaiChiang Rai, Thailand 811.7×
- 93MechelenFlanders, Belgium 811.7×
- 95Silao de la VictoriaGuanajuato, Mexico 811.7×
- 96JüchenNorth Rhine-Westphalia, Germany 801.7×
- 97FengshanTakao, Taiwan 801.6×
- 98KaohsiungTakao, Taiwan 801.6×
- 99LampangLampang, Thailand 791.6×
- 99BonnNorth Rhine-Westphalia, Germany 791.6×
- 101GostivarGostivar, North Macedonia 791.6×
- 102AntananarivoAnalamanga, Madagascar 791.6×
- 102ZhudongTaiwan, Taiwan 791.6×
- 104TaibaoTaiwan, Taiwan 791.6×
- 105Debrecenlow-cost sensorsHajdú-Bihar, Hungary 781.6×
- 105Bang NaBangkok, Thailand 781.6×
- 107EdinburgTexas, United States 781.6×
- 108PhraePhrae, Thailand 781.6×
- 108YuanlinTaiwan, Taiwan 781.6×
- 108TilburgNorth Brabant, The Netherlands 781.6×
- 108BredaNorth Brabant, The Netherlands 781.6×
- 108WillebroekFlanders, Belgium 781.6×
- 108AntwerpFlanders, Belgium 781.6×
- 108SarajevoFederation of B&H, Bosnia and Herzegovina 781.6×
- 115KölnNorth Rhine-Westphalia, Germany 771.5×
- 116ZhubeiTaiwan, Taiwan 771.5×
- 116Corpus ChristiTexas, United States 771.5×
- 118Sing BuriSing Buri, Thailand 761.5×
- 119NettetalNorth Rhine-Westphalia, Germany 761.5×
- 120Kampalalow-cost sensorsCentral Region, Uganda 761.5×
- 120Ubon RatchathaniUbon Ratchathani, Thailand 761.5×
- 120KapellenFlanders, Belgium 761.5×
- 123Karachilow-cost sensorsSindh, Pakistan 751.5×
- 123Lop BuriLopburi, Thailand 751.5×
- 125XinyingTaiwan, Taiwan 751.5×
- 126PhayaoPhayao, Thailand 751.5×
- 126KalasinKalasin, Thailand 751.5×
- 126ErlinTaiwan, Taiwan 751.5×
- 126CopiapóAtacama, Chile 751.5×
- 130TetovoTetovo, North Macedonia 751.5×
- 130NantouTaiwan, Taiwan 751.5×
- 130ShanghaiShanghai, China 751.5×
- 130HoustonTexas, United States 751.5×
- 134YeojuGyeonggi-do, South Korea 741.4×
- 134São PauloSão Paulo, Brazil 741.4×
- 134Pachuca de SotoHidalgo, Mexico 741.4×
- 137RidderkerkSouth Holland, The Netherlands 741.4×
- 138HeerlenLimburg, The Netherlands 741.4×
- 138MönchengladbachNorth Rhine-Westphalia, Germany 741.4×
- 138Ceglie MessapicaApulia, Italy 741.4×
- 141AsprópyrgosAttica, Greece 731.4×
- 142TratTrat, Thailand 731.4×
- 143Khon KaenKhon Kaen, Thailand 731.4×
- 143ZwijndrechtFlanders, Belgium 731.4×
- 145LochristiFlanders, Belgium 731.4×
- 145Khlong Sam WaBangkok, Thailand 731.4×
- 147EindhovenNorth Brabant, The Netherlands 731.4×
- 148ToufenTaiwan, Taiwan 721.4×
- 149Chiang RaiChiang Rai, Thailand 721.4×
- 149BeverenFlanders, Belgium 721.4×
- 151IwataShizuoka, Japan 721.4×
- 151RotterdamSouth Holland, The Netherlands 721.4×
- 153AntofagastaAntofagasta, Chile 721.3×
- 153MiamiFlorida, United States 721.3×
- 155Nakhon SawanNakhon Sawan, Thailand 711.3×
- 156JinchengFukien, Taiwan 711.3×
- 157SaraburiSaraburi, Thailand 711.3×
- 157MiaoliTaiwan, Taiwan 711.3×
- 157SpijkenisseSouth Holland, The Netherlands 711.3×
- 157SalernoCampania, Italy 711.3×
- 157AcerraCampania, Italy 711.3×
- 162RatchaburiRatchaburi, Thailand 711.3×
- 162Belle GladeFlorida, United States 711.3×
- 164BitolaBitola, North Macedonia 711.3×
- 165PuliTaiwan, Taiwan 711.3×
- 165Fort LauderdaleFlorida, United States 711.3×
- 167AcharnésAttica, Greece 701.3×
- 167Udon ThaniUdon Thani, Thailand 701.3×
- 167HsinchuTaiwan, Taiwan 701.3×
- 167San Juan del RíoQuerétaro, Mexico 701.3×
- 171KasaokaOkayama, Japan 701.3×
- 172TaichungTaiwan, Taiwan 701.3×
- 172VenrayLimburg, The Netherlands 701.3×
- 172Jacobo HunterArequipa, Peru 701.3×
- 172IrapuatoGuanajuato, Mexico 701.3×
- 172Coconut CreekFlorida, United States 701.3×
- 172Saphan SungBangkok, Thailand 701.3×
- 178GlasgowScotland, United Kingdom 701.3×
- 178East LakeFlorida, United States 701.3×
- 180JeddahMecca Region, Saudi Arabia 691.3×
- 180Mae SotTak, Thailand 691.3×
- 180Mission BendTexas, United States 691.3×
- 183NaplesCampania, Italy 691.3×
- 184XizhouTaiwan, Taiwan 691.3×
- 184KameyamaMie, Japan 691.3×
- 184EdinburghScotland, United Kingdom 691.3×
- 184HomesteadFlorida, United States 691.3×
- 188PátraWest Greece, Greece 691.2×
- 189FukuroiShizuoka, Japan 691.2×
- 189RoeselareFlanders, Belgium 691.2×
- 189BensalemPennsylvania, United States 691.2×
- 192Kamphaeng PhetKamphaeng Phet, Thailand 691.2×
- 192Kan’onjichōKagawa, Japan 691.2×
- 192IzegemFlanders, Belgium 691.2×
- 195Nakhon NayokNakhon Nayok, Thailand 681.2×
- 195MinatoWakayama, Japan 681.2×
- 195León de los AldamaGuanajuato, Mexico 681.2×
- 198BorCentral Serbia, Serbia 681.2×
- 198ShulinTaipei, Taiwan 681.2×
- 200PhetchabunPhetchabun, Thailand 681.2×
Top 200 of 2,316 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 18, 2024, smogrank.com/history/2024-05-18 (accessed 3 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.