What is the air quality trend in Ōnojō?

Over the past 8 days, Ōnojō had an average AQI of 63 based on station measurements. The worst day was 2026-10-14 with AQI 84.

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

165h

PM2.5 Station

165h · 27 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	43	23–91	12.7 µg/m³	4h	30
2026-10-20	52	24–148	14.6 µg/m³	24h	22
2026-10-19	64	35–145	18.7 µg/m³	24h	20
2026-10-18	37	20–74	9.0 µg/m³	24h	23
2026-10-17	69	36–158	21.4 µg/m³	24h	20
2026-10-16	84	50–156	27.4 µg/m³	24h	19
2026-10-15	78	30–171	26.1 µg/m³	24h	20
2026-10-14	84	31–161	28.4 µg/m³	17h	21

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