What is the air quality trend in Ōtsu?

Over the past 8 days, Ōtsu had an average AQI of 55 based on station measurements. The worst day was 2026-07-22 with AQI 76.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 29 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	76	60–95	24.1 µg/m³	6h	37
2026-07-21	57	42–65	15.2 µg/m³	23h	26
2026-07-20	54	42–61	13.7 µg/m³	24h	32
2026-07-19	46	33–60	11.1 µg/m³	24h	38
2026-07-18	47	33–58	11.7 µg/m³	24h	42
2026-07-17	54	45–60	13.5 µg/m³	24h	41
2026-07-16	57	50–64	15.0 µg/m³	24h	38
2026-07-15	55	49–67	14.3 µg/m³	18h	38

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