What is the air quality trend in Kosai?

Over the past 8 days, Kosai had an average AQI of 55 based on station measurements. The worst day was 2026-07-22 with AQI 74.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 10 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	74	70–79	23.2 µg/m³	47.0	2h	14
2026-07-21	63	51–92	17.9 µg/m³	35.3	23h	11
2026-07-20	54	41–59	13.9 µg/m³	20.9	24h	15
2026-07-19	44	32–56	10.7 µg/m³	11.2	24h	17
2026-07-18	43	23–59	10.4 µg/m³	12.7	24h	20
2026-07-17	55	42–64	14.1 µg/m³	30.7	24h	18
2026-07-16	57	48–64	14.8 µg/m³	27.8	24h	17
2026-07-15	54	47–62	13.8 µg/m³	25.6	21h	17

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