What is the air quality trend in Ōmihachiman?

Over the past 21 days, Ōmihachiman had an average AQI of 35 based on station measurements. The worst day was 2026-05-31 with AQI 52.

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

479h

PM2.5 Station

479h · 15 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	30	19–38	7.3 µg/m³	7h	14
2026-06-08	26	20–34	6.2 µg/m³	24h	18
2026-06-07	27	18–40	6.4 µg/m³	24h	17
2026-06-06	34	22–45	8.0 µg/m³	24h	18
2026-06-05	29	23–36	7.0 µg/m³	24h	18
2026-06-04	31	24–42	7.3 µg/m³	24h	17
2026-06-03	27	19–46	6.4 µg/m³	24h	17
2026-06-02	27	15–37	6.6 µg/m³	24h	17
2026-06-01	46	23–68	11.6 µg/m³	24h	16
2026-05-31	52	42–62	12.9 µg/m³	24h	15
2026-05-30	47	32–166	13.2 µg/m³	24h	15
2026-05-29	41	26–59	9.9 µg/m³	24h	15
2026-05-28	34	20–68	8.2 µg/m³	24h	16
2026-05-27	34	22–50	8.1 µg/m³	24h	17
2026-05-26	35	28–50	8.4 µg/m³	24h	16
2026-05-25	37	26–44	9.0 µg/m³	24h	16
2026-05-24	37	26–57	9.0 µg/m³	24h	16
2026-05-23	38	27–66	9.1 µg/m³	24h	17
2026-05-22	34	21–54	8.2 µg/m³	24h	16
2026-05-21	38	21–162	10.7 µg/m³	24h	16
2026-05-20	34	25–52	8.2 µg/m³	16h	16

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