What is the air quality trend in Ōtsu?

Over the past 8 days, Ōtsu had an average AQI of 62 based on station measurements. The worst day was 2026-10-15 with AQI 86.

How is Ōtsu air quality measured?

Air quality in Ōtsu 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 Ōtsu, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 53 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	44	35–74	11.3 µg/m³	7h	58
2026-10-20	50	31–75	13.1 µg/m³	24h	54
2026-10-19	58	37–82	15.9 µg/m³	24h	49
2026-10-18	41	28–61	10.0 µg/m³	24h	57
2026-10-17	62	37–99	17.8 µg/m³	24h	52
2026-10-16	76	46–149	23.8 µg/m³	24h	41
2026-10-15	86	48–153	28.3 µg/m³	24h	53
2026-10-14	81	36–151	26.2 µg/m³	15h	43

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