SmogRank / World / Asia / Japan / Kumamoto

Most polluted cities in Kumamoto, Japan

15 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Honmachi at 9.7 µg/m³, #417 in the world.

Kagoshima: 9 measured citiesKumamoto: 15 measured citiesMiyazaki: 8 measured citiesNagasaki: 11 measured citiesOita: 9 measured citiesSaga: 10 measured citiesFukuoka: 22 measured cities#15 Aso: 7.0 µg/m³#14 Mifune: 8.0 µg/m³#13 Uto: 8.2 µg/m³#12 Kumamoto: 8.3 µg/m³#10 Tamana: 8.5 µg/m³#11 Kikuchi: 8.5 µg/m³#9 Kotō: 8.6 µg/m³#8 Arao: 8.7 µg/m³#6 Uekimachi-mōno: 8.8 µg/m³#7 Hondomachi-hondo: 8.8 µg/m³#5 Ōyanomachi-noboritate: 9.0 µg/m³#4 Hitoyoshi: 9.1 µg/m³#3 Minamata: 9.2 µg/m³#2 Ōzu: 9.4 µg/m³#1 Honmachi: 9.7 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Honmachi 9.7 WHO 24-hour guideline
Every measured city in Kumamoto, Japan, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Honmachi 52
  2. 2Ōzu 52
  3. 3Minamata 51
  4. 4Hitoyoshi 51
  5. 5Ōyanomachi-noboritate 50
  6. 6Uekimachi-mōno 49
  7. 7Hondomachi-hondo 49
  8. 8Arao 48
  9. 9Kotō 48
  10. 10Tamana 47
  11. 11Kikuchi 47
  12. 12Kumamoto 46
  13. 13Uto 46
  14. 14Mifune 44
  15. 15Aso 39
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

Estimated: cities without a monitor

Kumamoto cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Amakusa≈ 8 µg/m³Good
Kōshi≈ 10 µg/m³Moderate
Uki≈ 10 µg/m³Moderate
Okino≈ 10 µg/m³Moderate
Shimada≈ 10 µg/m³Moderate
Matsubase≈ 10 µg/m³Moderate
Ushibukamachi≈ 9 µg/m³Good
Nagasu≈ 8 µg/m³Good
Sashiki≈ 10 µg/m³Moderate

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SmogRank, most polluted cities in Kumamoto, Japan, PM2.5, last 30 days to 2 Oct 2026, 02:00 UTC, smogrank.com/jp/region/kumamoto?w=30d.

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Updated 2026-10-02 02:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.