What is the air quality trend in Ōmihachiman?

Over the past 8 days, Ōmihachiman had an average AQI of 35 based on station measurements. The worst day was 2026-05-30 with AQI 40.

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

166h

PM2.5 Station

166h · 27 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	40	35–45	9.7 µg/m³	5h	37
2026-05-29	38	31–49	9.2 µg/m³	24h	37
2026-05-28	33	23–48	7.8 µg/m³	24h	36
2026-05-27	30	20–50	7.3 µg/m³	24h	40
2026-05-26	31	24–39	7.6 µg/m³	24h	39
2026-05-25	36	30–43	8.6 µg/m³	24h	38
2026-05-24	38	26–49	9.1 µg/m³	24h	38
2026-05-23	36	27–51	8.5 µg/m³	17h	39

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