SmogRank / World / Japan / Gunma / 2025

Most polluted cities in Gunma, Japan, 2025

9 cities in Gunma, Japan ranked by their average PM2.5 over the 365 days; 9 above the WHO annual guideline (5.0 µg/m³). Worst: Tatebayashi at 10.5 µg/m³, #813 of 2,624 cities in the world. Cleanest: Saikubo at 8.0. 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.

← Ōta 1% 0.75%0
Every city in Gunma, Japan ranked for 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. 1Ōta
    1%
  2. 2Sakai-nakajima
    1%
  3. 3Tatebayashi
    1%
  4. 4Tomioka
    0%
  5. 5Shibukawa
    0%
  6. 6Kiryū
    0%
  7. 7Numata
    0%
  8. 7Nakanojō
    0%
  9. 9Saikubo
    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

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SmogRank, most polluted cities in Gunma, Japan, PM2.5, 2025, smogrank.com/jp/region/gunma/history/2025 (accessed 6 Oct 2026).

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