What is the air quality trend in Aso?

Over the past 8 days, Aso had an average AQI of 50 based on station measurements. The worst day was 2026-10-16 with AQI 65.

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

165h

PM2.5 Station

165h · 19 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	34	25–42	8.2 µg/m³	12h	21
2026-10-20	51	25–153	14.4 µg/m³	24h	19
2026-10-19	47	31–79	11.8 µg/m³	24h	18
2026-10-18	36	26–53	8.6 µg/m³	24h	22
2026-10-17	52	31–91	13.7 µg/m³	24h	18
2026-10-16	65	30–142	19.1 µg/m³	24h	17
2026-10-15	61	31–160	18.3 µg/m³	24h	18
2026-10-14	57	25–101	17.0 µg/m³	9h	17

Back to Aso Air Quality