SmogRank / World / Japan / Hokkaido / February 2024
Most polluted cities in Hokkaido, Japan, February 2024
10 cities in Hokkaido, Japan ranked by their average PM2.5 over the 29 days. Worst: Asahikawa at 10.7 µg/m³, #575 of 2,437 cities in the world. Cleanest: Kushiro at 5.6. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for one of these days. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
About 0 people in these 4 cities breathed unhealthy air on an average day of February 2024.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
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
All cities in the world, February 2024 · All cities in Japan, February 2024 · Hokkaido now
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SmogRank, most polluted cities in Hokkaido, Japan, PM2.5, February 2024, smogrank.com/jp/region/hokkaido/history/2024-02 (accessed 6 Oct 2026).
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.