What is the air quality trend in Aso?

Over the past 8 days, Aso had an average AQI of 44 based on station measurements. The worst day was 2026-10-14 with AQI 59.

How is Aso air quality measured?

Air quality in Aso 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 Aso, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 33 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	35	26–40	8.4 µg/m³	9h	29
2026-10-20	40	28–54	9.8 µg/m³	24h	25
2026-10-19	44	32–63	10.9 µg/m³	24h	23
2026-10-18	34	22–51	8.1 µg/m³	24h	26
2026-10-17	42	31–53	10.1 µg/m³	24h	24
2026-10-16	56	36–136	14.9 µg/m³	24h	21
2026-10-15	49	27–88	12.8 µg/m³	24h	23
2026-10-14	59	28–115	17.4 µg/m³	13h	20

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