What is the air quality trend in Karuizawa?

Over the past 3 days, Karuizawa had an average AQI of 26 based on station measurements. The worst day was 2026-06-08 with AQI 27.

How is Karuizawa air quality measured?

Air quality in Karuizawa 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 Karuizawa, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 1 station

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	27	17–43	6.4 µg/m³	13h	7
2026-06-08	27	17–55	6.4 µg/m³	24h	8
2026-06-07	25	22–32	5.9 µg/m³	11h	8

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