What is the air quality trend in Koga?

Over the past 8 days, Koga had an average AQI of 28 based on station measurements. The worst day was 2026-06-05 with AQI 31.

How is Koga air quality measured?

Air quality in Koga 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 Koga, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 3 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	26	19–30	6.2 µg/m³	8h	48
2026-06-08	27	21–33	6.6 µg/m³	24h	63
2026-06-07	28	23–32	6.7 µg/m³	24h	63
2026-06-06	31	26–41	7.4 µg/m³	24h	58
2026-06-05	31	24–37	7.3 µg/m³	24h	62
2026-06-04	29	23–34	6.9 µg/m³	24h	59
2026-06-03	28	22–36	6.8 µg/m³	24h	60
2026-06-02	28	22–33	6.7 µg/m³	16h	60

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