What is the air quality trend in Shimodate?

Over the past 8 days, Shimodate had an average AQI of 45 based on station measurements. The worst day was 2026-10-16 with AQI 55.

How is Shimodate air quality measured?

Air quality in Shimodate 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 Shimodate, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 23 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	41	29–80	10.4 µg/m³	12h	28
2026-10-20	43	34–56	10.3 µg/m³	24h	24
2026-10-19	46	30–63	11.3 µg/m³	24h	24
2026-10-18	38	20–60	9.1 µg/m³	24h	27
2026-10-17	45	30–55	11.0 µg/m³	24h	24
2026-10-16	55	25–88	14.9 µg/m³	24h	21
2026-10-15	49	29–87	12.9 µg/m³	24h	23
2026-10-14	49	27–103	13.7 µg/m³	10h	21

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