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 1▼284
  2. 2Ōzu 1▼282
  3. 3Minamata 1▼276
  4. 4Hitoyoshi 1▼275
  5. 5Ōyanomachi-noboritate 1▼299
  6. 6Uekimachi-mōno 1▼300
  7. 7Hondomachi-hondo 1▼298
  8. 8Arao 1▼292
  9. 9Kotō 1▼276
  10. 10Tamana 1▼302
  11. 11Kikuchi 1▼301
  12. 12Kumamoto 1▼292
  13. 13Uto 1▼297
  14. 14Mifune 1▼276
  15. 15Aso 1▼232
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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/m³Low risk
Kōshi≈ 10 µg/m³Low risk
Uki≈ 10 µg/m³Low risk
Okino≈ 10 µg/m³Low risk
Shimada≈ 10 µg/m³Low risk
Matsubase≈ 10 µg/m³Low risk
Ushibukamachi≈ 9 µg/m³Low risk
Nagasu≈ 8 µg/m³Low risk
Sashiki≈ 10 µg/m³Low risk

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SmogRank, most polluted cities in Kumamoto, Japan, PM2.5, last 30 days to 2 Oct 2026, 05:00 UTC, smogrank.com/jp/region/kumamoto?w=30d.

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Updated 2026-10-02 05:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.