SmogRank / World / Japan / Osaka / 2024

Most polluted cities in Osaka, Japan, 2024

1 city in Osaka, Japan ranked by their average PM2.5 over the 366 days; 1 above the WHO annual guideline (5.0 µg/m³). The only one: Toyonaka at 7.7 µg/m³, #1,192 of 2,052 cities in the world. 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.

OpenAQ's archive, where our readings come from, has almost none from Japan for March 21, 2024: cities in Japan are averaged over their other days. Why.

Osaka has 16 cities ranked over the last 30 days, but only 1 here: most of its monitors have no readings for 2024 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.

About 1.18K people in this city breathed unhealthy air on an average day of 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.

  1. 1Toyonaka
    1.18K
Good0–50
Moderate51–100
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

All cities in the world, 2024 · All cities in Japan, 2024 · Osaka now

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SmogRank, most polluted cities in Osaka, Japan, PM2.5, 2024, smogrank.com/jp/region/osaka/history/2024 (accessed 6 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.