What is the air quality trend in Ashiya?

Over the past 15 days, Ashiya had an average AQI of 40 based on station measurements. The worst day was 2026-05-15 with AQI 55.

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

330h

PM2.5 Station

330h · 87 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	40	29–48	9.7 µg/m³	22h	60
2026-05-28	38	23–58	9.1 µg/m³	24h	60
2026-05-27	29	20–36	6.9 µg/m³	24h	66
2026-05-26	32	22–42	7.7 µg/m³	24h	66
2026-05-25	39	30–93	9.8 µg/m³	24h	61
2026-05-24	37	27–48	8.9 µg/m³	24h	64
2026-05-23	36	26–53	8.6 µg/m³	24h	64
2026-05-22	33	25–42	8.0 µg/m³	24h	64
2026-05-21	38	22–48	9.1 µg/m³	24h	62
2026-05-20	37	28–45	9.0 µg/m³	24h	68
2026-05-19	42	30–57	10.2 µg/m³	24h	68
2026-05-18	54	47–67	13.7 µg/m³	24h	64
2026-05-17	49	36–56	11.9 µg/m³	22h	68
2026-05-16	54	48–60	13.5 µg/m³	21h	69
2026-05-15	55	55–55	13.9 µg/m³	1h	71

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