SmogRank / World / Japan / Okayama / April 2024
Most people breathing unhealthy air in Okayama, Japan, April 2024
4 cities in Okayama, Japan measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 30 days. The most people breathing unhealthy air: Okayama, Japan, about 25.9K on an average day. A city needs measurements on 70% of the days to be ranked.
About 44.7K people in these 4 cities breathed unhealthy air on an average day of April 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, April 2024 · All cities in Japan, April 2024 · Okayama now
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SmogRank, most polluted cities in Okayama, Japan, by people breathing unhealthy air, PM2.5, April 2024, smogrank.com/jp/region/okayama/history/2024-04?by=people (accessed 7 Oct 2026).
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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.