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 9.7
  2. 2Ōzu 9.4
  3. 3Minamata 9.2
  4. 4Hitoyoshi 9.1
  5. 5Ōyanomachi-noboritate 9.0
  6. 6Uekimachi-mōno 8.8
  7. 7Hondomachi-hondo 8.8
  8. 8Arao 8.7
  9. 9Kotō 8.6
  10. 10Tamana 8.5
  11. 11Kikuchi 8.5
  12. 12Kumamoto 8.3
  13. 13Uto 8.2
  14. 14Mifune 8.0
  15. 15Aso 7.0
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. 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/m³Fair
Kōshi≈ 10 µg/m³Fair
Uki≈ 10 µg/m³Fair
Okino≈ 10 µg/m³Fair
Shimada≈ 10 µg/m³Fair
Matsubase≈ 10 µg/m³Fair
Ushibukamachi≈ 9 µg/m³Fair
Nagasu≈ 8 µg/m³Fair
Sashiki≈ 10 µg/m³Fair

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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 in µg/m³.