SmogRank / World / Japan / Kumamoto / April 2026

Most polluted cities in Kumamoto, Japan, April 2026

15 cities in Kumamoto, Japan ranked by their average PM2.5 over the 30 days. Worst: Tomioka at 11.2 µg/m³, #770 of 2,914 cities in the world. Cleanest: Aso at 6.6. 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.

← Tomioka 0% 0.75%0
Every city in Kumamoto, Japan ranked for April 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. 1Tomioka
    0%
  2. 2Ōyanomachi-noboritate
    0%
  3. 2Kumamoto
    0%
  4. 4Uekimachi-mōno
    0%
  5. 5Kotō
    0%
  6. 6Tamana
    0%
  7. 6Iwashita
    0%
  8. 8Kikuchi
    0%
  9. 8Arao
    0%
  10. 10Uto
    0%
  11. 11Honmachi
    0%
  12. 12Ōzu
    0%
  13. 13Minamata
    0%
  14. 14Hitoyoshi
    0%
  15. 15Aso
    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 Kumamoto, Japan, PM2.5, April 2026, smogrank.com/jp/region/kumamoto/history/2026-04 (accessed 6 Oct 2026).

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