What is the air quality trend in Kosai?

Over the past 8 days, Kosai had an average AQI of 31 based on station measurements. The worst day was 2026-05-23 with AQI 34.

How is Kosai air quality measured?

Air quality in Kosai 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 Kosai, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 23 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	34	29–41	8.2 µg/m³	7.9	14h	20
2026-05-28	29	22–42	7.0 µg/m³	6.5	24h	20
2026-05-27	27	15–37	6.5 µg/m³	7.0	24h	21
2026-05-26	29	19–39	6.9 µg/m³	7.7	24h	20
2026-05-25	32	24–40	7.8 µg/m³	10.5	24h	20
2026-05-24	34	26–39	8.1 µg/m³	10.6	24h	21
2026-05-23	34	24–57	8.1 µg/m³	6.1	24h	22
2026-05-22	29	20–37	7.0 µg/m³	7.6	9h	21

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