SmogRank / World / Japan / Tochigi / November 2025

Most polluted cities in Tochigi, Japan, November 2025

10 cities in Tochigi, Japan ranked by their average PM2.5 over the 30 days. Worst: Oyama at 11.4 µg/m³, #809 of 2,662 cities in the world. Cleanest: Imaichi at 5.3. 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.

← Oyama 0% 0.75%0
Every city in Tochigi, 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. 1Oyama
    0%
  2. 2Sano
    0%
  3. 3Utsunomiya
    0%
  4. 4Mooka
    0%
  5. 5Kaminokawa
    0%
  6. 6Yaita
    0%
  7. 6Kanuma
    0%
  8. 8Tochigi
    0%
  9. 9Nasukarasuyama
    0%
  10. 10Imaichi
    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 · Tochigi now

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SmogRank, most polluted cities in Tochigi, Japan, PM2.5, November 2025, smogrank.com/jp/region/tochigi/history/2025-11 (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.