What is the air quality trend in Kumamoto?

Over the past 8 days, Kumamoto had an average AQI of 48 based on station measurements. The worst day was 2026-10-14 with AQI 63.

How is Kumamoto air quality measured?

Air quality in Kumamoto is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Kumamoto, Japan

Name: Kumamoto Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Kumamoto, Japan.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 26 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	31	25–38	7.5 µg/m³	10h	22
2026-10-20	43	30–107	11.1 µg/m³	24h	19
2026-10-19	45	20–66	11.2 µg/m³	24h	18
2026-10-18	36	26–55	8.7 µg/m³	24h	21
2026-10-17	52	33–76	13.5 µg/m³	24h	18
2026-10-16	57	29–109	15.5 µg/m³	24h	16
2026-10-15	59	32–160	17.9 µg/m³	24h	17
2026-10-14	63	27–97	19.5 µg/m³	12h	18

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