All 3,290 cities by unhealthy days, 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.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Cities with the same share are ordered by more unhealthy days, then by the higher average.

=996SaseboNagasaki, Japan 0%0 of 30
=996HigashiosakaOsaka, Japan 0%0 of 30
=996SukayamaChiba, Japan 0%0 of 29
=996TimaruCanterbury, New Zealand 0%0 of 30
=996La Línea de la ConcepciónAndalusia, Spain 0%0 of 30
=996BredaNorth Brabant, The Netherlands 0%0 of 29
=996WeizStyria, Austria 0%0 of 30
=996TraunUpper Austria, Austria 0%0 of 30
=996Bruck an der MurStyria, Austria 0%0 of 30
=996NeubrandenburgMecklenburg-Vorpommern, Germany 0%0 of 30
=996Hamburglast full day 10 OctHamburg, Germany 0%0 of 27
=996Burghausenlast full day 10 OctBavaria, Germany 0%0 of 27
=996Liptovský MikulášŽilina Region, Slovakia 0%0 of 30
=996BratislavaBratislava Region, Slovakia 0%0 of 30
=996MerateLombardy, Italy 0%0 of 29
=996GuaratinguetáSão Paulo, Brazil 0%0 of 30
=996IndianapolisIndiana, United States 0%0 of 30
=996Corpus ChristiTexas, United States 0%0 of 30
=996HoustonTexas, United States 0%0 of 30
=996Long BeachCalifornia, United States 0%0 of 30
=996Santa MonicaCalifornia, United States 0%0 of 30
=996TorranceCalifornia, United States 0%0 of 29
=996WillowsCalifornia, United States 0%0 of 29
=996MatsuuraNagasaki, Japan 0%0 of 30
=1025VelesVeles, North Macedonia 0%0 of 30
=1025JangheungJeollanam-do, South Korea 0%0 of 28
=1025YokkaichiMie, Japan 0%0 of 30
=1025TajimiGifu, Japan 0%0 of 30
=1025Kaseda-shirakameKagoshima, Japan 0%0 of 30
=1025GamagōriAichi, Japan 0%0 of 30
=1025ToowoombaQueensland, Australia 0%0 of 30
=1025WinterthurZurich, Switzerland 0%0 of 30
=1025AmstettenLower Austria, Austria 0%0 of 30
=1025Nuremberglast full day 10 OctBavaria, Germany 0%0 of 27
=1025Neustadt an der Donaulast full day 10 OctBavaria, Germany 0%0 of 27
=1025Ludwigshafen am Rheinlast full day 10 OctRheinland-Pfalz, Germany 0%0 of 27
=1025DunkirkHauts-de-France, France 0%0 of 30
=1025OščadnicaŽilina Region, Slovakia 0%0 of 30
=1025KościerzynaPomerania, Poland 0%0 of 30
=1025BiellaPiedmont, Italy 0%0 of 30
=1025Terre HauteIndiana, United States 0%0 of 30
=1025WichitaKansas, United States 0%0 of 30
=1025El PasoTexas, United States 0%0 of 30
=1025Great FallsMontana, United States 0%0 of 27
=1025Kogalast full day 11 OctFukuoka, Japan 0%0 of 28
=1025HigashihiroshimaHiroshima, Japan 0%0 of 28
=1047PhetchabunPhetchabun, Thailand 0%0 of 30
=1047ToyohashiAichi, Japan 0%0 of 30
=1047TamanoOkayama, Japan 0%0 of 30
=1047OnodaYamaguchi, Japan 0%0 of 30
=1047ŌmuraNagasaki, Japan 0%0 of 30
=1047InuyamaAichi, Japan 0%0 of 30
=1047AnjōAichi, Japan 0%0 of 30
=1047GranadaAndalusia, Spain 0%0 of 30
=1047BasildonEngland, United Kingdom 0%0 of 30
=1047Würzburglast full day 10 OctBavaria, Germany 0%0 of 27
=1047Krefeldlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=1047Duisburglast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=1047BudapestBudapest, Hungary 0%0 of 30
=1047MikulovSouth Moravian, Czechia 0%0 of 30
=1047Gasteiz / VitoriaBasque Country, Spain 0%0 of 30
=1047PaarlWestern Cape, South Africa 0%0 of 29
=1047AtlantaGeorgia, United States 0%0 of 30
=1047AugustaGeorgia, United States 0%0 of 30
=1047Deer ParkTexas, United States 0%0 of 30
=1047Lake ElsinoreCalifornia, United States 0%0 of 29
=1047ModestoCalifornia, United States 0%0 of 26
=1047SeogwipoJeju-do, South Korea 0%0 of 28
=1047Arden-ArcadeCalifornia, United States 0%0 of 26
=1047ShikokuchūōEhime, Japan 0%0 of 30
=1071PhichitPhichit, Thailand 0%0 of 30
=1071NeietsuGangwon-do, South Korea 0%0 of 29
=1071Jeju CityJeju-do, South Korea 0%0 of 29
=1071YamagaKumamoto, Japan 0%0 of 27
=1071SuzukaMie, Japan 0%0 of 30
=1071SaikūMie, Japan 0%0 of 30
=1071Kan’onjichōKagawa, Japan 0%0 of 30
=1071Imarichō-kōSaga, Japan 0%0 of 30
=1071FukuroiShizuoka, Japan 0%0 of 30
=1071LiverpoolNew South Wales, Australia 0%0 of 26
=1071WelsUpper Austria, Austria 0%0 of 30
=1071Oberhausenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=1071Münsterlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=1071Bottroplast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=1071Chorvátsky Grob - Čierna VodaBratislava Region, Slovakia 0%0 of 30
=1071ZlínZlín, Czechia 0%0 of 30
=1071JihlavaVysocina, Czechia 0%0 of 30
=1071ElblągWarmia-Masuria, Poland 0%0 of 30
=1071LaivesTrentino-Alto Adige, Italy 0%0 of 30
=1071Ciudad Benito JuárezNuevo León, Mexico 0%0 of 25
=1071TallahasseeFlorida, United States 0%0 of 25
=1071EdinburgTexas, United States 0%0 of 30
=1071MissionTexas, United States 0%0 of 30
=1071San LeandroCalifornia, United States 0%0 of 30
=1071SunnysideWashington, United States 0%0 of 30
=1071InabeMie, Japan 0%0 of 30
=1071NisshinAichi, Japan 0%0 of 26
=1098AsprópyrgosAttica, Greece 0%0 of 30
=1098TarnówLesser Poland, Poland 0%0 of 30
=1098Si Sa KetSi Sa Ket, Thailand 0%0 of 30

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 unhealthy days (PM2.5), last 30 days to 14 Oct 2026, 07:00 UTC: each city's share of its measured days with a daily mean over 35.4 µg/m³, 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=days. Ranked on low-cost sensors, with no reference monitor in the city: #1 Peshawar, #2 Multan, #5 Kasur, #7 Gujranwala, #8 Lahore, #9 Faisalabad and #10 Jammu. Some values from Sensor.Community, ODbL. Some readings from Vietnam's government monitors; Department of Environment, Nepal; Aurassure; 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; Department of Environment, Nepal; Aurassure; 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).