What is the air quality trend in Kōshi?

Over the past 8 days, Kōshi had an average AQI of 54 based on station measurements. The worst day was 2026-10-14 with AQI 75.

How is Kōshi air quality measured?

Air quality in Kōshi 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 Kōshi, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 30 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	44	28–87	12.5 µg/m³	4h	28
2026-10-20	51	30–145	13.8 µg/m³	24h	22
2026-10-19	52	32–146	13.9 µg/m³	24h	21
2026-10-18	36	24–76	8.8 µg/m³	24h	24
2026-10-17	49	31–80	12.6 µg/m³	24h	19
2026-10-16	67	42–125	19.8 µg/m³	24h	17
2026-10-15	59	25–88	16.6 µg/m³	24h	19
2026-10-14	75	28–141	24.0 µg/m³	17h	17

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