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.

=2798Grao de MurviedroValencia, Spain 0%0 of 30
=2798HalesworthEngland, United Kingdom 0%0 of 30
=2798SurseeLucerne, Switzerland 0%0 of 24
=2798Roetgenlast full day 10 OctNorth Rhine-Westphalia, Germany 0%0 of 27
=2798Goslarlast full day 10 OctLower Saxony, Germany 0%0 of 27
=2798CorkMunster, Ireland 0%0 of 30
=2798Saint-MaloBrittany, France 0%0 of 28
=2798Saint-Étienne-de-MontlucPays de la Loire, France 0%0 of 30
=2798QuimperBrittany, France 0%0 of 30
=2798MoulinsAuvergne-Rhône-Alpes, France 0%0 of 30
=2798CrollesAuvergne-Rhône-Alpes, France 0%0 of 30
=2798BourgesCentre-Val de Loire, France 0%0 of 30
=2798Coconut CreekFlorida, United States 0%0 of 30
=2798Deerfield BeachFlorida, United States 0%0 of 30
=2798Fort MyersFlorida, United States 0%0 of 30
=2798Safety HarborFlorida, United States 0%0 of 30
=2798Winthrop HarborIllinois, United States 0%0 of 30
=2798EastpointeMichigan, United States 0%0 of 30
=2798BellevueNebraska, United States 0%0 of 30
=2798MendhamNew Jersey, United States 0%0 of 30
=2798PainesvilleOhio, United States 0%0 of 30
=2798Warrensville HeightsOhio, United States 0%0 of 30
=2798MadisonWisconsin, United States 0%0 of 30
=2798Ridgecrestlast full day 10 OctCalifornia, United States 0%0 of 27
=2798AlbuquerqueNew Mexico, United States 0%0 of 30
=2798AnthonyNew Mexico, United States 0%0 of 21
=2798EnochUtah, United States 0%0 of 30
=2798HurricaneUtah, United States 0%0 of 30
=2798LongmontColorado, United States 0%0 of 28
=2798YakimaWashington, United States 0%0 of 30
=2798SmithersBritish Columbia, Canada 0%0 of 24
=2798St. ThomasOntario, Canada 0%0 of 30
=2798ŌshūIwate, Japan 0%0 of 28
=2834RigaRiga, Latvia 0%0 of 29
=2834GabrovoGabrovo, Bulgaria 0%0 of 30
=2834NonoichiIshikawa, Japan 0%0 of 30
=2834BuñolValencia, Spain 0%0 of 30
=2834GillinghamEngland, United Kingdom 0%0 of 30
=2834CoventryEngland, United Kingdom 0%0 of 30
=2834CheltenhamEngland, United Kingdom 0%0 of 27
=2834Cheadle HulmeEngland, United Kingdom 0%0 of 30
=2834BarnsleyEngland, United Kingdom 0%0 of 30
=2834Zell am SeeSalzburg, Austria 0%0 of 30
=2834CharleroiWallonia, Belgium 0%0 of 30
=2834Uslarlast full day 10 OctLower Saxony, Germany 0%0 of 27
=2834TrochtelfingenBaden-Wurttemberg, Germany 0%0 of 30
=2834GärtringenBaden-Wurttemberg, Germany 0%0 of 30
=2834FüssenBavaria, Germany 0%0 of 30
=2834Braunlagelast full day 10 OctLower Saxony, Germany 0%0 of 27
=2834PortlaoiseLeinster, Ireland 0%0 of 30
=2834Cluain MealaMunster, Ireland 0%0 of 30
=2834CavanUlster, Ireland 0%0 of 30
=2834RodezOccitanie, France 0%0 of 30
=2834Montoir-de-BretagnePays de la Loire, France 0%0 of 30
=2834LimogesNew Aquitaine, France 0%0 of 29
=2834BesançonBourgogne-Franche-Comté, France 0%0 of 25
=2834LeónCastille and León, Spain 0%0 of 26
=2834Daytona BeachFlorida, United States 0%0 of 30
=2834Palm CityFlorida, United States 0%0 of 28
=2834EdgewoodMaryland, United States 0%0 of 28
=2834Cleveland HeightsOhio, United States 0%0 of 29
=2834New HavenConnecticut, United States 0%0 of 30
=2834BrocktonMassachusetts, United States 0%0 of 30
=2834Port HuronMichigan, United States 0%0 of 30
=2834Fort Leelast full day 11 OctNew Jersey, United States 0%0 of 28
=2834GreensburgPennsylvania, United States 0%0 of 30
=2834Las VegasNevada, United States 0%0 of 30
=2834LubbockTexas, United States 0%0 of 30
=2834Crescent CityCalifornia, United States 0%0 of 22
=2834FlorenceOregon, United States 0%0 of 30
=2834Rapid CitySouth Dakota, United States 0%0 of 30
=2834CornwallOntario, Canada 0%0 of 30
=2834GuelphOntario, Canada 0%0 of 30
=2834ShawiniganQuebec, Canada 0%0 of 30
=2834Swift CurrentSaskatchewan, Canada 0%0 of 30
=2834KuriharaMiyagi, Japan 0%0 of 30
=2834IzunokuniShizuoka, Japan 0%0 of 28
=2834Helena Valley West CentralMontana, United States 0%0 of 27
=2834KostelMunicipality of Kostel, Slovenia 0%0 of 30
=2880TartuTartu, Estonia 0%0 of 30
=2880UenoharaYamanashi, Japan 0%0 of 30
=2880KushiroHokkaido, Japan 0%0 of 30
=2880NewportWales, United Kingdom 0%0 of 30
=2880Milton KeynesEngland, United Kingdom 0%0 of 30
=2880LimerickMunster, Ireland 0%0 of 30
=2880BarBar, Montenegro 0%0 of 30
=2880BearDelaware, United States 0%0 of 30
=2880WilmingtonDelaware, United States 0%0 of 30
=2880Belle GladeFlorida, United States 0%0 of 30
=2880Lake MaryFlorida, United States 0%0 of 30
=2880Sarasota SpringsFlorida, United States 0%0 of 30
=2880ScaggsvilleMaryland, United States 0%0 of 29
=2880UniontownPennsylvania, United States 0%0 of 30
=2880Saint CloudMinnesota, United States 0%0 of 29
=2880HermitagePennsylvania, United States 0%0 of 28
=2880SchlusserPennsylvania, United States 0%0 of 27
=2880WyomissingPennsylvania, United States 0%0 of 30
=2880SuperiorWisconsin, United States 0%0 of 30
=2880Weirton HeightsWest Virginia, United States 0%0 of 30
=2880DenverColorado, United States 0%0 of 28

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).