What is the air quality trend in Ashiya?

Over the past 8 days, Ashiya had an average AQI of 49 based on station measurements. The worst day was 2026-05-22 with AQI 111.

How is Ashiya air quality measured?

Air quality in Ashiya 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 Ashiya, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 67 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	43	32–54	10.4 µg/m³	23h	48
2026-05-28	44	25–66	10.9 µg/m³	24h	47
2026-05-27	34	20–52	8.1 µg/m³	24h	47
2026-05-26	37	19–55	9.0 µg/m³	24h	47
2026-05-25	44	31–84	10.8 µg/m³	24h	45
2026-05-24	42	24–58	10.3 µg/m³	24h	48
2026-05-23	39	28–58	9.5 µg/m³	24h	44
2026-05-22	111	111–111	39.7 µg/m³	1h	2

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