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.

=2357SolvangCalifornia, United States 0%0 of 29
=2357HobbsNew Mexico, United States 0%0 of 30
=2357Red BluffCalifornia, United States 0%0 of 29
=2357Twin FallsIdaho, United States 0%0 of 30
=2357Cottage GroveOregon, United States 0%0 of 30
=2357BellinghamWashington, United States 0%0 of 30
=2357ShorelineWashington, United States 0%0 of 30
=2357TulalipWashington, United States 0%0 of 30
=2357BurnabyBritish Columbia, Canada 0%0 of 30
=2357CranbrookBritish Columbia, Canada 0%0 of 29
=2357LangleyBritish Columbia, Canada 0%0 of 30
=2357LethbridgeAlberta, Canada 0%0 of 30
=2357VictoriaBritish Columbia, Canada 0%0 of 29
=2357SusonoShizuoka, Japan 0%0 of 30
=2357SadoNiigata, Japan 0%0 of 29
=2357Mango HillQueensland, Australia 0%0 of 30
=2357BarakiChiba, Japan 0%0 of 28
=2418ŌyauchiFukushima, Japan 0%0 of 30
=2418AjikiChiba, Japan 0%0 of 30
=2418AomoriAomori, Japan 0%0 of 30
=2418TorreviejaValencia, Spain 0%0 of 30
=2418EldaValencia, Spain 0%0 of 30
=2418PlymouthEngland, United Kingdom 0%0 of 30
=2418DoncasterEngland, United Kingdom 0%0 of 30
=2418WormerNorth Holland, The Netherlands 0%0 of 23
=2418HoensbroekLimburg, The Netherlands 0%0 of 30
=2418BastogneWallonia, Belgium 0%0 of 26
=2418WieslochBaden-Wurttemberg, Germany 0%0 of 30
=2418Göttingenlast full day 10 OctLower Saxony, Germany 0%0 of 27
=2418Bad BelzigBrandenburg, Germany 0%0 of 30
=2418VerdunGrand Est, France 0%0 of 27
=2418Saint-DizierGrand Est, France 0%0 of 30
=2418DijonBourgogne-Franche-Comté, France 0%0 of 28
=2418Miranda de EbroCastille and León, Spain 0%0 of 26
=2418McCordsvilleIndiana, United States 0%0 of 30
=2418RaymoreMissouri, United States 0%0 of 30
=2418LebanonOhio, United States 0%0 of 30
=2418HarrisonburgVirginia, United States 0%0 of 30
=2418PoquosonVirginia, United States 0%0 of 29
=2418Moundsvillelast full day 10 OctWest Virginia, United States 0%0 of 27
=2418BraidwoodIllinois, United States 0%0 of 30
=2418RedfordMichigan, United States 0%0 of 30
=2418Jersey CityNew Jersey, United States 0%0 of 30
=2418DublinOhio, United States 0%0 of 30
=2418BensalemPennsylvania, United States 0%0 of 27
=2418Sioux FallsSouth Dakota, United States 0%0 of 30
=2418OconomowocWisconsin, United States 0%0 of 30
=2418NogalesArizona, United States 0%0 of 30
=2418Paysonlast full day 11 OctArizona, United States 0%0 of 23
=2418ThorntonColorado, United States 0%0 of 28
=2418Columbia CityWashington, United States 0%0 of 29
=2418GibsonsBritish Columbia, Canada 0%0 of 29
=2418RichmondBritish Columbia, Canada 0%0 of 30
=2418Sorel-TracyQuebec, Canada 0%0 of 30
=2418YonoOsaka, Japan 0%0 of 30
=2418TakizawaIwate, Japan 0%0 of 28
=2418LiberpolisCounty of Osijek-Baranja, Croatia 0%0 of 27
=2458TakayamaGifu, Japan 0%0 of 30
=2458Kameda-honchōNiigata, Japan 0%0 of 29
=2458YachimataChiba, Japan 0%0 of 28
=2458MiyakoIwate, Japan 0%0 of 30
=2458KōzakiChiba, Japan 0%0 of 30
=2458KawasakiMiyagi, Japan 0%0 of 30
=2458IshiokaIbaraki, Japan 0%0 of 30
=2458LourinhãLisbon, Portugal 0%0 of 30
=2458Stoke-on-TrentEngland, United Kingdom 0%0 of 30
=2458Southend-on-SeaEngland, United Kingdom 0%0 of 30
=2458PrestonEngland, United Kingdom 0%0 of 30
=2458Newcastle upon TyneEngland, United Kingdom 0%0 of 30
=2458LutonEngland, United Kingdom 0%0 of 30
=2458HorleyEngland, United Kingdom 0%0 of 25
=2458DewsburyEngland, United Kingdom 0%0 of 30
=2458RixensartWallonia, Belgium 0%0 of 30
=2458Klötzelast full day 10 OctSaxony-Anhalt, Germany 0%0 of 27
=2458Kahlalast full day 10 OctThuringia, Germany 0%0 of 27
=2458OlivetCentre-Val de Loire, France 0%0 of 21
=2458LormontNew Aquitaine, France 0%0 of 30
=2458L'Isle-d'AbeauAuvergne-Rhône-Alpes, France 0%0 of 30
=2458La Roche-sur-YonPays de la Loire, France 0%0 of 30
=2458Joué-lès-ToursCentre-Val de Loire, France 0%0 of 30
=2458Beaumont-sur-OiseÎle-de-France, France 0%0 of 30
=2458AuxerreBourgogne-Franche-Comté, France 0%0 of 30
=2458KourouGuyane, French Guiana 0%0 of 30
=2458MarigotSaint Martin 0%0 of 30
=2458McDonoughGeorgia, United States 0%0 of 30
=2458HarrimanTennessee, United States 0%0 of 29
=2458AnkenyIowa, United States 0%0 of 30
=2458SavoyIllinois, United States 0%0 of 30
=2458LafayetteIndiana, United States 0%0 of 29
=2458TaylorMichigan, United States 0%0 of 28
=2458YpsilantiMichigan, United States 0%0 of 30
=2458MankatoMinnesota, United States 0%0 of 30
=2458BeatriceNebraska, United States 0%0 of 27
=2458NewarkNew Jersey, United States 0%0 of 30
=2458MedinaOhio, United States 0%0 of 30
=2458Beaver FallsPennsylvania, United States 0%0 of 30
=2458HersheyPennsylvania, United States 0%0 of 28
=2458Natrona HeightsPennsylvania, United States 0%0 of 30
=2458WilkinsburgPennsylvania, United States 0%0 of 29
=2458PawtucketRhode Island, United States 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).