SmogRank / World / Japan / Nagano / June 2026

Most polluted cities in Nagano, Japan, June 2026

12 cities in Nagano, Japan ranked by their average PM2.5 over the 30 days. Worst: Hakuba at 8.1 µg/m³, #1,020 of 2,466 cities in the world. Cleanest: Ueda at 5.1. 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.

← Hakuba 0% 0.75%0
Every city in Nagano, Japan ranked for June 2026, 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. 1Hakuba
    0%
  2. 2Iida
    0%
  3. 3Nagano
    0%
  4. 4Kiso
    0%
  5. 5Suwa
    0%
  6. 6Matsumoto
    0%
  7. 7Obuse
    0%
  8. 8Chikuma
    0%
  9. 9Okaya
    0%
  10. 10Saku
    0%
  11. 11Ina
    0%
  12. 12Ueda
    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, June 2026 · All cities in Japan, June 2026 · Nagano now

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SmogRank, most polluted cities in Nagano, Japan, PM2.5, June 2026, smogrank.com/jp/region/nagano/history/2026-06 (accessed 6 Oct 2026).

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