SmogRank / World / Asia / Japan / Kumamoto

Most polluted cities in Kumamoto, Japan

16 measured cities, last 7 days; 0 above the WHO 24-hour guideline. Worst: Minamata at 10.9 µg/m³, #622 in the world.

Kagoshima: 9 measured citiesKumamoto: 16 measured citiesMiyazaki: 8 measured citiesNagasaki: 11 measured citiesOita: 9 measured citiesSaga: 10 measured citiesFukuoka: 21 measured cities#16 Yamaga: 7.0 µg/m³#15 Aso: 7.5 µg/m³#14 Tamana: 7.6 µg/m³#13 Arao: 8.2 µg/m³#12 Kikuchi: 8.4 µg/m³#11 Uto: 8.5 µg/m³#10 Uekimachi-mōno: 8.7 µg/m³#9 Kumamoto: 9.0 µg/m³#8 Ōyanomachi-noboritate: 9.3 µg/m³#7 Mifune: 9.4 µg/m³#6 Kotō: 9.7 µg/m³#5 Hondomachi-hondo: 9.8 µg/m³#4 Ōzu: 10.0 µg/m³#3 Honmachi: 10.6 µg/m³#2 Hitoyoshi: 10.8 µg/m³#1 Minamata: 10.9 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Minamata 10.9 µg/m³ 15 µg/m³ WHO 24-hour guideline0
Every measured city in Kumamoto, Japan, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Minamata 54▼264
  2. 2Hitoyoshi 54▼286
  3. 3Honmachi 54▼273
  4. 4Ōzu 53▼357
  5. 5Hondomachi-hondo 52▼262
  6. 6Kotō 52▼379
  7. 7Mifune 52▼415
  8. 8Ōyanomachi-noboritate 51▼341
  9. 9Kumamoto 50▼430
  10. 10Uekimachi-mōno 48▼423
  11. 11Uto 47▼428
  12. 12Kikuchi 47▼499
  13. 13Arao 46▼312
  14. 14Tamana 42▼392
  15. 15Aso 42▼640
  16. 16Yamaga 39▼468
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 7 days to 2 Oct 2026, 06:00 UTC, smogrank.com/jp/region/kumamoto?w=7d.

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Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.