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, #710 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 14
  2. 2Ōzu 14
  3. 3Minamata 14
  4. 4Hitoyoshi 13
  5. 5Ōyanomachi-noboritate 13
  6. 6Uekimachi-mōno 13
  7. 7Hondomachi-hondo 13
  8. 8Arao 13
  9. 9Kotō 13
  10. 10Tamana 13
  11. 11Kikuchi 13
  12. 12Kumamoto 12
  13. 13Uto 12
  14. 14Mifune 12
  15. 15Aso 10
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. 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/m³Excellent
Kōshi≈ 10 µg/m³Excellent
Uki≈ 10 µg/m³Excellent
Okino≈ 10 µg/m³Excellent
Shimada≈ 10 µg/m³Excellent
Matsubase≈ 10 µg/m³Excellent
Ushibukamachi≈ 9 µg/m³Excellent
Nagasu≈ 8 µg/m³Excellent
Sashiki≈ 10 µg/m³Excellent

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SmogRank, most polluted cities in Kumamoto, Japan, PM2.5, last 30 days to 2 Oct 2026, 03:00 UTC, smogrank.com/jp/region/kumamoto?w=30d.

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Updated 2026-10-02 03:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the China AQI PM2.5 sub-index.