650 cities by people breathing unhealthy air, last 30 days

Every city with enough measurements in this window, worst first.

CPCB in India: no readings since 12 Oct (488 monitors). EEA in Spain: no readings since 13 Oct (310 monitors). Their cities show older figures or are missing from this board, not clean.

About 98.8M people in these 650 cities breathed unhealthy air on an average day over the last 30 days.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

101QuettaBalochistan, Pakistan 0
102TemucoAraucania, Chile 0
103CoronelBiobio, Chile 0
104Los ÁngelesBiobio, Chile 0
105AshaimanGreater Accra, Ghana 0
106Cremonalast full day 11 OctLombardy, Italy 0
107QuinteroValparaiso, Chile 0
108eMbalenhleMpumalanga, South Africa 0
109Lak SiBangkok, Thailand 0
110TalcahuanoBiobio, Chile 0
111PuchuncavíValparaiso, Chile 0
112QuillotaValparaiso, Chile 0
113GuwahatiAssam, India 0
114MokpoJeollanam-do, South Korea 0
=115TemaGreater Accra, Ghana 0
=115Viña del MarValparaiso, Chile 0
117Trevigliolast full day 11 OctLombardy, Italy 0
118ErlinTaiwan, Taiwan 0
119ChiguayanteBiobio, Chile 0
=120BelgradeCentral Serbia, Serbia 0
=120JeongeupJeollabuk-do, South Korea 0
122GuadalajaraJalisco, Mexico 0
=123PietermaritzburgKwaZulu-Natal, South Africa 0
=123Nong KhaemBangkok, Thailand 0
125TangjinChungcheongnam-do, South Korea 0
126Gimpo-siGyeonggi-do, South Korea 0
=127Kalaburagilast full day 11 OctKarnataka, India 0
=127BuanJeollabuk-do, South Korea 0
=127AguascalientesAguascalientes, Mexico 0
130YeojuGyeonggi-do, South Korea 0
=131YesanChungcheongnam-do, South Korea 0
=131Milanlast full day 11 OctLombardy, Italy 0
=133BangkokBangkok, Thailand 0
=133GunsanJeollabuk-do, South Korea 0
=135TainanTaiwan, Taiwan 0
=135Rio ClaroSão Paulo, Brazil 0
=137IksanJeollabuk-do, South Korea 0
=137HongseongChungcheongnam-do, South Korea 0
=137Ciudad NezahualcoyotlMéxico, Mexico 0
140SevillaAndalusia, Spain 0
141TaichungTaiwan, Taiwan 0
=142AccraGreater Accra, Ghana 0
=142FreetownWestern Area, Sierra Leone 0
=144Ganghwa-gunIncheon, South Korea 0
=144PueblaPuebla, Mexico 0
=144TlaquepaqueJalisco, Mexico 0
=147DurgChhattisgarh, India 0
=147Ban Khlong PrawetBangkok, Thailand 0
=149YŏnmuChungcheongnam-do, South Korea 0
=149San Pedro SulaCortés Department, Honduras 0
=151MuanJeollanam-do, South Korea 0
=151IncheonIncheon, South Korea 0
=153DebrecenHajdú-Bihar, Hungary 0
=153Icheon-siGyeonggi-do, South Korea 0
=153CheorwonGangwon-do, South Korea 0
=156SkopjeGrad Skopje, North Macedonia 0
=156Bang PakongChachoengsao, Thailand 0
=156WrocławLower Silesia, Poland 0
159NamsaJeollabuk-do, South Korea 0
160RayongRayong, Thailand 0
=161KaohsiungTakao, Taiwan 0
=161Guri-siGyeonggi-do, South Korea 0
=161GumiGyeongsangbuk-do, South Korea 0
=161Goyang-siGyeonggi-do, South Korea 0
=161Ansan-siGyeonggi-do, South Korea 0
166SoachaCundinamarca, Colombia 0
167OsanGyeonggi-do, South Korea 0
168KoesanNorth Chungcheong, South Korea 0
=169ShakaskraalKwaZulu-Natal, South Africa 0
=169BoryeongChungcheongnam-do, South Korea 0
=169MasanGwangju, South Korea 0
=169PortoPorto, Portugal 0
=169AsunciónAsuncion, Paraguay 0
=169Yongsan-dongSeoul, South Korea 0
=175NeiliTaiwan, Taiwan 0
=175SeoulSeoul, South Korea 0
=175Cheongju-siNorth Chungcheong, South Korea 0
=175FresnoCalifornia, United States 0
=179JouniehMount Lebanon, Lebanon 0
=179SuwonGyeonggi-do, South Korea 0
=179Anyang-siGyeonggi-do, South Korea 0
182ShenzhenTaiwan, Taiwan 0
=183PrayagrajUttar Pradesh, India 0
=183AsanChungcheongnam-do, South Korea 0
=183CheonanChungcheongnam-do, South Korea 0
=183Chinch'ŏnNorth Chungcheong, South Korea 0
=183Donghae CityGangwon-do, South Korea 0
=183ŁódźŁódź Voivodeship, Poland 0
=183Mexico CityMexico City, Mexico 0
=190MiddelburgMpumalanga, South Africa 0
=190NonsanChungcheongnam-do, South Korea 0
=190MunsanGyeonggi-do, South Korea 0
193Chiang MaiChiang Mai, Thailand 0
194Sai MaiBangkok, Thailand 0
=195Jilavalast full day 10 OctIlfov, Romania 0
=195TaipeiTaiwan, Taiwan 0
=195SuncheonJeollanam-do, South Korea 0
=195JeonjuJeollabuk-do, South Korea 0
=195AbidjanAbidjan Autonomous District, Ivory Coast 0
200Bucheon-siGyeonggi-do, South Korea 0

What stands behind each figure: Checked at 2+ sites One reference monitor Low-cost sensors About these marks

Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.

Good0–50

Moderate51–100

Unhealthy for 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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.

Use this board

SmogRank, all cities ranked by people breathing unhealthy air (PM2.5), last 30 days to 14 Oct 2026, 07:00 UTC: each city's population times its share of measured days with a daily mean over 35.4 µg/m³ (only cities with 2 or more monitoring places 3 km or more apart), cities measured on 21 or more of the 30 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/rankings?w=30d&by=people. Ranked on low-cost sensors, with no reference monitor in the city: #1 Lahore, #2 Dhaka, #4 Peshawar, #8 Faisalabad and #10 Rawalpindi. Some values from Sensor.Community, ODbL. Some readings from Vietnam's government monitors; Aurassure; Department of Environment, Nepal; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published.

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-14 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Vietnam's government monitors; Aurassure; Department of Environment, Nepal; RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver); Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published (why we use them).