What is the air quality trend in Ōiso?

Over the past 8 days, Ōiso had an average AQI of 31 based on station measurements. The worst day was 2026-05-23 with AQI 34.

How is Ōiso air quality measured?

Air quality in Ōiso 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 Ōiso, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	32	16–41	7.7 µg/m³	10.6	15h	49
2026-05-28	28	20–36	6.7 µg/m³	8.5	24h	52
2026-05-27	31	21–41	7.4 µg/m³	9.9	24h	58
2026-05-26	31	21–41	7.4 µg/m³	9.5	24h	55
2026-05-25	32	26–39	7.8 µg/m³	10.7	24h	55
2026-05-24	34	26–43	8.2 µg/m³	12.1	24h	57
2026-05-23	34	25–40	8.2 µg/m³	13.0	24h	59
2026-05-22	26	22–31	6.3 µg/m³	7.7	9h	56

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