SmogRank / Rankings
516 cities by checked peak, last 7 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 checked peak: each city's worst 6 hours in a row, read by at least 2 monitoring places 3 km or more apart (the second-highest place's average over those hours), so one faulty monitor or smoke over one corner of a city can't set it. 516 of these 2,895 cities are ranked: those measured at 2 or more such places on enough of the days.
- 500ReykjavíkCapital Region, Iceland 34
- =502PortsmouthEngland, United Kingdom 32
- =502OsloOslo, Norway 32
- =504MorwellVictoria, Australia 31
- =504Spring ValleyNevada, United States 31
- =506Hood RiverOregon, United States 28
- =506NepeanOntario, Canada 28
- =506SaguenayQuebec, Canada 28
- 509SalemOregon, United States 27
- =510CoventryEngland, United Kingdom 27
- =510MeadWashington, United States 27
- 512FunchalMadeira, Portugal 24
- 513Casas AdobesArizona, United States 24
- =514Clermont-FerrandAuvergne-Rhône-Alpes, France 23
- =514LakewoodColorado, United States 23
- 516TamperePirkanmaa, Finland 19
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.
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 checked peak PM2.5 (µg/m³), last 7 days to 14 Oct 2026, 07:00 UTC: each city's worst 6 hours in a row, read by 2 or more monitoring places 3 km or more apart, cities with a checked peak on 5 or more of the 7 days. Monitor data from national networks via OpenAQ and the publishers listed at smogrank.com/sources. smogrank.com/rankings?w=7d&by=peak. Ranked on low-cost sensors, with no reference monitor in the city: #1 Burunday, #2 Faisalabad, #3 Otegen Batyra, #4 Multan, #6 Peshawar, #7 Lahore, #8 Gujranwala, #9 Dhaka and #10 Kinshasa. Some readings from Aurassure; Vietnam's government monitors; Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), 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 readings: Aurassure; Vietnam's government monitors; Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).