What is the air quality trend in Shimodate?

Over the past 8 days, Shimodate had an average AQI of 50 based on station measurements. The worst day was 2026-10-14 with AQI 70.

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

165h

PM2.5 Station

165h · 34 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	36	30–43	8.6 µg/m³	8h	36
2026-10-20	45	31–113	11.8 µg/m³	24h	29
2026-10-19	51	25–118	13.5 µg/m³	24h	28
2026-10-18	35	25–54	8.5 µg/m³	24h	30
2026-10-17	48	33–80	12.2 µg/m³	24h	28
2026-10-16	59	43–105	16.5 µg/m³	24h	25
2026-10-15	57	32–168	17.2 µg/m³	24h	27
2026-10-14	70	24–161	22.9 µg/m³	13h	25

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