What is the air quality trend in Ōnojō?

Over the past 15 days, Ōnojō had an average AQI of 45 based on station measurements. The worst day was 2026-07-21 with AQI 60.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 25 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	50	50–50	12.0 µg/m³	1h	25
2026-07-21	60	37–103	16.4 µg/m³	24h	13
2026-07-20	53	36–75	13.6 µg/m³	24h	20
2026-07-19	46	33–60	11.2 µg/m³	24h	24
2026-07-18	47	32–69	11.7 µg/m³	24h	26
2026-07-17	55	32–63	14.1 µg/m³	24h	25
2026-07-16	56	45–64	14.5 µg/m³	24h	24
2026-07-15	55	44–70	14.2 µg/m³	24h	24
2026-07-14	48	34–66	11.6 µg/m³	24h	25
2026-07-13	49	36–62	12.2 µg/m³	24h	23
2026-07-12	46	35–107	11.5 µg/m³	24h	24
2026-07-11	29	19–65	7.2 µg/m³	24h	23
2026-07-10	28	18–43	6.8 µg/m³	24h	26
2026-07-09	33	22–46	7.9 µg/m³	24h	23
2026-07-08	32	23–43	7.7 µg/m³	21h	26

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