The world's most polluted cities, ranked
Fine-particle pollution (PM2.5) in 0 cities, measured by ground monitors, worst first. This year.
Worst
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Cities ranked
0
in 0 countries
Over the WHO guideline
0%
0 cities averaging above 5 µg/m³ (annual guideline)
Cleanest
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No city has enough measurements for this window yet.
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Coverage: we rank only cities whose monitor data is published under a licence we can use. Several of the most polluted countries (India, China, South Korea, Thailand, Turkey among them) don't yet publish such data through our source, so their cities are missing, not clean. Why, and what we're doing about it.
Biggest climbers today
Movement shows once the board is a day old.
Cleanest air
Updated 2026-10-01 02:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.