SmogRank / World / Japan / Yamagata / January 2025
Most polluted cities in Yamagata, Japan, January 2025
2 cities in Yamagata, Japan ranked by their average PM2.5 over the 31 days. Worst: Sagae at 7.5 µg/m³, #1,525 of 2,426 cities in the world. Cleanest: Yamagata at 6.7. A city needs measurements on 70% of the days to be ranked.
Yamagata has 9 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for January 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.
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
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SmogRank, most polluted cities in Yamagata, Japan, PM2.5, January 2025, smogrank.com/jp/region/yamagata/history/2025-01 (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.