All 3,291 cities by PM2.5, last 30 days

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

CPCB in India: no readings since 12 Oct (488 monitors). EEA and Catalonia Medi Ambient I Sostenibilitat in Spain: no readings since 13 Oct (336 monitors). Their cities show older figures or are missing from this board, not clean.

=2882Weirton HeightsWest Virginia, United States 25 US AQI▼292
=2882DenverColorado, United States 25 US AQI▼291
=2882BothellWashington, United States 25 US AQI
=2882MontréalQuebec, Canada 25 US AQI▼317
=2882St. CatharinesOntario, Canada 25 US AQI▼252
=2882QuébecQuebec, Canada 25 US AQI▼357
=2882West Vancouverlast full day 11 OctBritish Columbia, Canada 25 US AQI▼284
=2908HelsinkiUusimaa, Finland 24 US AQI▼336
=2908Gorna OryahovitsaVeliko Tarnovo, Bulgaria 24 US AQI▼309
=2908SakuNagano, Japan 24 US AQI▼246
=2908GoulburnNew South Wales, Australia 24 US AQI▼334
=2908Royal Leamington SpaEngland, United Kingdom 24 US AQI
=2908IrlamEngland, United Kingdom 24 US AQI
=2908DunholmeEngland, United Kingdom 24 US AQI
=2908CreweEngland, United Kingdom 24 US AQI
=2908AylesburyEngland, United Kingdom 24 US AQI
=2908AndoverEngland, United Kingdom 24 US AQI
=2908Tarplast full day 10 OctSchleswig-Holstein, Germany 24 US AQI▼444
=2908LeixlipLeinster, Ireland 24 US AQI▼302
=2908Dún LaoghaireLeinster, Ireland 24 US AQI▼333
=2908BlanchardstownLeinster, Ireland 24 US AQI▼370
=2908RevinGrand Est, France 24 US AQI▼301
=2908NiortNew Aquitaine, France 24 US AQI▼300
=2908NeversBourgogne-Franche-Comté, France 24 US AQI▼299
=2908MontluçonAuvergne-Rhône-Alpes, France 24 US AQI▼298
=2908LourdesOccitanie, France 24 US AQI▼332
=2908ClaymontDelaware, United States 24 US AQI▼244
=2908SeafordDelaware, United States 24 US AQI▼273
=2908DavieFlorida, United States 24 US AQI▼295
=2908East LakeFlorida, United States 24 US AQI▼243
=2908WellingtonFlorida, United States 24 US AQI▼292
=2908AshburnVirginia, United States 24 US AQI▼272
=2908WaterburyConnecticut, United States 24 US AQI▼271
=2908SpringfieldMassachusetts, United States 24 US AQI▼270
=2908BrainerdMinnesota, United States 24 US AQI▼320
=2908AllentownPennsylvania, United States 24 US AQI▼268
=2908AppletonWisconsin, United States 24 US AQI▼265
=2908TomahWisconsin, United States 24 US AQI▼264
=2908Apache JunctionArizona, United States 24 US AQI▼288
=2908Crescent CityCalifornia, United States 24 US AQI▼261
=2908WindsorColorado, United States 24 US AQI▼287
=2908BoiseIdaho, United States 24 US AQI▼286
=2908TalentOregon, United States 24 US AQI▼316
=2908LongviewWashington, United States 24 US AQI▼283
=2908RidgefieldWashington, United States 24 US AQI▼314
=2908Spokane ValleyWashington, United States 24 US AQI▼388
=2908BramptonOntario, Canada 24 US AQI▼253
=2908BrossardQuebec, Canada 24 US AQI▼313
=2908OakvilleOntario, Canada 24 US AQI▼279
=2908WaterdownOntario, Canada 24 US AQI▼251
=2908HakubaNagano, Japan 24 US AQI▼179
=2952LaaksolahtiUusimaa, Finland 24 US AQI▼320
=2952AlmeríaAndalusia, Spain 24 US AQI▼350
=2952WorcesterEngland, United Kingdom 24 US AQI
=2952SunderlandEngland, United Kingdom 24 US AQI
=2952SeafordEngland, United Kingdom 24 US AQI
=2952ChesterfieldEngland, United Kingdom 24 US AQI
=2952ZierenbergHesse, Germany 24 US AQI▼348
=2952FürthHesse, Germany 24 US AQI▼347
=2952MallowMunster, Ireland 24 US AQI
=2952TroyesGrand Est, France 24 US AQI
=2952PanazolNew Aquitaine, France 24 US AQI
=2952La RochelleNew Aquitaine, France 24 US AQI
=2952FontainebleauÎle-de-France, France 24 US AQI▼318
=2952Cangas del Narcealast full day 11 OctAsturias, Spain 24 US AQI
=2952Kennett SquarePennsylvania, United States 24 US AQI▼284
=2952CharlottesvilleVirginia, United States 24 US AQI▼283
=2952Rose HillVirginia, United States 24 US AQI▼282
=2952BrookingsSouth Dakota, United States 24 US AQI▼311
=2952GlendaleArizona, United States 24 US AQI▼307
=2952LakewoodColorado, United States 24 US AQI▼125
=2952MoscowIdaho, United States 24 US AQI▼329
=2952ButteMontana, United States 24 US AQI▼303
=2952Forest GroveOregon, United States 24 US AQI▼302
=2952North OgdenUtah, United States 24 US AQI▼328
=2952Walla WallaWashington, United States 24 US AQI▼325
=2952ChathamOntario, Canada 24 US AQI▼268
=2952Picnic Point-North LynnwoodWashington, United States 24 US AQI▼292
=2952Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada 24 US AQI▼321
=2980VantaaUusimaa, Finland 23 US AQI▼319
=2980InaNagano, Japan 23 US AQI▼294
=2980SwindonEngland, United Kingdom 23 US AQI
=2980ReadingEngland, United Kingdom 23 US AQI
=2980CannockEngland, United Kingdom 23 US AQI
=2980JumetWallonia, Belgium 23 US AQI▼377
=2980RoscommonConnacht, Ireland 23 US AQI
=2980Clermont-FerrandAuvergne-Rhône-Alpes, France 23 US AQI▼292
=2980BloisCentre-Val de Loire, France 23 US AQI▼475
=2980Bellegarde-sur-ValserineAuvergne-Rhône-Alpes, France 23 US AQI▼291
=2980AngletNew Aquitaine, France 23 US AQI
=2980NewarkDelaware, United States 23 US AQI▼290
=2980Winter ParkFlorida, United States 23 US AQI▼314
=2980Atlantic CityNew Jersey, United States 23 US AQI▼313
=2980South VinelandNew Jersey, United States 23 US AQI▼288
=2980Fall RiverMassachusetts, United States 23 US AQI▼265
=2980Detroit LakesMinnesota, United States 23 US AQI▼341
=2980State CollegePennsylvania, United States 23 US AQI▼309
=2980WarrenPennsylvania, United States 23 US AQI▼284
=2980RutlandVermont, United States 23 US AQI▼338
=2980BridgeportConnecticut, United States 23 US AQI▼283

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 mean PM2.5 (µg/m³), last 30 days to 14 Oct 2026, 06:00 UTC: each city's mean of its daily means, 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. Ranked on low-cost sensors, with no reference monitor in the city: #1 Kasur, #2 Gujranwala, #3 Kuala Lumpur, #5 Lahore, #6 Faisalabad, #9 Peshawar and #10 Dhaka. 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 (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 06:07 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).