SmogRank / World / Japan / Shiga / November 2025

Most polluted cities in Shiga, Japan, November 2025

9 cities in Shiga, Japan ranked by their average PM2.5 over the 30 days. Worst: Youkaichi at 9.8 µg/m³, #1,041 of 2,662 cities in the world. Cleanest: Kōka at 6.8. 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.

← Youkaichi 0% 0.75%0
Every city in Shiga, Japan ranked for November 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. 1Youkaichi
    0%
  2. 2Kusatsu
    0%
  3. 3Takashima
    0%
  4. 4Ōmihachiman
    0%
  5. 5Hikone
    0%
  6. 6Ōtsu
    0%
  7. 7Kitahama
    0%
  8. 8Nagahama
    0%
  9. 9Kōka
    0%
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, November 2025 · All cities in Japan, November 2025 · Shiga now

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SmogRank, most polluted cities in Shiga, Japan, PM2.5, November 2025, smogrank.com/jp/region/shiga/history/2025-11 (accessed 6 Oct 2026).

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