What is the air quality trend in Kōshū?

Over the past 3 days, Kōshū had an average AQI of 37 based on station measurements. The worst day was 2026-10-20 with AQI 42.

How is Kōshū air quality measured?

Air quality in Kōshū 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 Kōshū, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 10 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	30	23–46	7.3 µg/m³	8.6	11h	12
2026-10-20	42	25–72	10.3 µg/m³	20.2	24h	13
2026-10-19	41	34–54	9.9 µg/m³	14.2	10h	13

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