What is the air quality trend in Ōnojō?

Over the past 7 days, Ōnojō had an average AQI of 28 based on station measurements. The worst day was 2026-05-23 with AQI 33.

How is Ōnojō air quality measured?

Air quality in Ōnojō 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 Ōnojō, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 31 stations

Temperature GFS model

27pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	30	16–40	7.3 µg/m³	23h	27
2026-05-27	24	17–29	5.7 µg/m³	24h	29
2026-05-26	28	18–41	6.8 µg/m³	24h	29
2026-05-25	31	21–41	7.6 µg/m³	24h	29
2026-05-24	30	23–37	7.2 µg/m³	24h	27
2026-05-23	33	23–44	7.9 µg/m³	24h	32
2026-05-22	26	18–38	6.3 µg/m³	23h	28

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