What is the air quality trend in Isumi?

Over the past 15 days, Isumi had an average AQI of 38 based on station measurements. The worst day was 2026-08-31 with AQI 52.

How is Isumi air quality measured?

Air quality in Isumi 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 Isumi, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 16 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	27	22–34	6.6 µg/m³	12h	19
2026-09-04	27	16–63	6.6 µg/m³	24h	20
2026-09-03	27	14–76	6.6 µg/m³	24h	17
2026-09-02	46	22–152	13.1 µg/m³	24h	19
2026-09-01	43	23–79	11.4 µg/m³	24h	18
2026-08-31	52	23–106	14.1 µg/m³	24h	16
2026-08-30	43	23–67	11.0 µg/m³	24h	17
2026-08-29	43	20–91	11.5 µg/m³	24h	18
2026-08-28	40	23–68	10.1 µg/m³	24h	19
2026-08-27	34	17–91	9.1 µg/m³	24h	20
2026-08-26	40	21–84	10.3 µg/m³	24h	19
2026-08-25	35	23–50	8.5 µg/m³	24h	20
2026-08-24	43	28–55	10.4 µg/m³	24h	21
2026-08-23	42	32–55	10.2 µg/m³	24h	20
2026-08-22	37	27–55	8.9 µg/m³	9h	20

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