SmogRank / World / Japan / Yamagata / March 2025

Most unhealthy days in Yamagata, Japan, March 2025

8 cities in Yamagata, Japan ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Sagae, Japan, 0 of 28 measured days. A city needs measurements on 70% of the days to be ranked.

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.

← Sagae 0% 0.75%0
Every city in Yamagata, Japan ranked for March 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Sagae
    0 of 28
  2. 2Nagai
    0 of 28
  3. 3Yamagata
    0 of 30
  4. 4Yonezawa
    0 of 31
  5. 5Shonai
    0 of 24
  6. 6Tsuruoka
    0 of 27
  7. 6Shinjō
    0 of 27
  8. 8Higashine
    0 of 25
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, March 2025 · All cities in Japan, March 2025 · Yamagata now

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SmogRank, most polluted cities in Yamagata, Japan, by unhealthy days, PM2.5, March 2025, smogrank.com/jp/region/yamagata/history/2025-03?by=days (accessed 8 Oct 2026).

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