What is the air quality trend in Ōnojō?

Over the past 8 days, Ōnojō had an average AQI of 39 based on station measurements. The worst day was 2026-08-01 with AQI 48.

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 CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

162h

PM2.5 Station

162h · 26 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	28	25–30	6.6 µg/m³	2h	25
2026-08-07	30	22–48	7.3 µg/m³	22h	17
2026-08-06	48	27–72	12.3 µg/m³	23h	10
2026-08-05	38	18–55	9.1 µg/m³	23h	8
2026-08-04	39	28–50	9.3 µg/m³	24h	16
2026-08-03	40	27–54	9.6 µg/m³	24h	15
2026-08-02	44	30–56	10.6 µg/m³	24h	15
2026-08-01	48	23–60	11.9 µg/m³	20h	17

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