What is the air quality trend in Ōmihachiman?

Over the past 8 days, Ōmihachiman had an average AQI of 55 based on station measurements. The worst day was 2026-10-15 with AQI 78.

How is Ōmihachiman air quality measured?

Air quality in Ōmihachiman 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 Ōmihachiman, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 34 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	42	24–91	11.2 µg/m³	8h	28
2026-10-20	48	33–64	12.2 µg/m³	24h	27
2026-10-19	52	29–102	14.1 µg/m³	24h	24
2026-10-18	35	25–55	8.5 µg/m³	24h	28
2026-10-17	58	33–96	16.3 µg/m³	24h	25
2026-10-16	67	42–151	19.8 µg/m³	24h	21
2026-10-15	78	32–169	26.3 µg/m³	24h	25
2026-10-14	67	48–105	19.7 µg/m³	13h	21

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