What is the air quality trend in Shimodate?

Over the past 14 days, Shimodate had an average AQI of 38 based on station measurements. The worst day was 2026-05-16 with AQI 51.

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

332h

PM2.5 Station

332h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	32	24–42	7.7 µg/m³	24h	29
2026-05-27	31	22–39	7.5 µg/m³	24h	31
2026-05-26	33	25–42	7.9 µg/m³	24h	31
2026-05-25	36	26–55	8.5 µg/m³	24h	30
2026-05-24	38	28–56	9.3 µg/m³	24h	30
2026-05-23	34	28–42	8.2 µg/m³	24h	31
2026-05-22	31	22–45	7.5 µg/m³	24h	30
2026-05-21	32	23–50	7.6 µg/m³	24h	28
2026-05-20	34	28–43	8.3 µg/m³	24h	32
2026-05-19	39	28–57	9.6 µg/m³	24h	31
2026-05-18	49	38–62	12.0 µg/m³	24h	31
2026-05-17	42	7–58	10.3 µg/m³	24h	29
2026-05-16	51	30–60	12.6 µg/m³	21h	31
2026-05-15	50	35–64	12.2 µg/m³	23h	29

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