What is the air quality trend in Shiojiri?

Over the past 15 days, Shiojiri had an average AQI of 35 based on station measurements. The worst day was 2026-05-18 with AQI 52.

How is Shiojiri air quality measured?

Air quality in Shiojiri 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 Shiojiri, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

331h

PM2.5 Station

331h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	38	21–52	9.2 µg/m³	5h	7
2026-05-29	35	15–57	8.4 µg/m³	24h	8
2026-05-28	30	18–45	7.1 µg/m³	24h	7
2026-05-27	27	13–47	6.5 µg/m³	24h	9
2026-05-26	28	10–47	6.8 µg/m³	24h	9
2026-05-25	31	19–55	7.4 µg/m³	24h	8
2026-05-24	30	20–41	7.2 µg/m³	24h	8
2026-05-23	31	19–42	7.3 µg/m³	24h	9
2026-05-22	28	11–40	6.6 µg/m³	24h	8
2026-05-21	28	16–51	6.7 µg/m³	24h	8
2026-05-20	34	18–53	8.2 µg/m³	24h	8
2026-05-19	40	26–60	9.7 µg/m³	24h	8
2026-05-18	52	25–63	13.2 µg/m³	24h	8
2026-05-17	46	30–64	11.4 µg/m³	22h	8
2026-05-16	51	30–61	13.1 µg/m³	16h	9

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