SmogRank / World / Japan / Hiroshima / April 2025
Most polluted cities in Hiroshima, Japan, April 2025
1 city in Hiroshima, Japan ranked by their average PM2.5 over the 30 days. The only one: Ōtake at 12.1 µg/m³, #744 of 2,896 cities in the world. A city needs measurements on 70% of the days to be ranked.
Hiroshima has 12 cities ranked over the last 30 days, but only 1 here: most of its monitors have no readings for April 2025 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Ōtake 0%
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 2025 · All cities in Japan, April 2025 · Hiroshima now
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SmogRank, most polluted cities in Hiroshima, Japan, PM2.5, April 2025, smogrank.com/jp/region/hiroshima/history/2025-04 (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.