What is the air quality trend in Umi?

Over the past 15 days, Umi had an average AQI of 45 based on station measurements. The worst day was 2026-07-21 with AQI 62.

How is Umi air quality measured?

Air quality in Umi 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 Umi, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 25 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	51	51–51	12.3 µg/m³	1h	25
2026-07-21	62	51–103	17.1 µg/m³	23h	12
2026-07-20	54	40–79	13.9 µg/m³	24h	17
2026-07-19	46	34–68	11.4 µg/m³	24h	20
2026-07-18	47	35–65	11.6 µg/m³	24h	22
2026-07-17	54	32–63	14.0 µg/m³	24h	21
2026-07-16	56	50–66	14.7 µg/m³	24h	20
2026-07-15	55	44–74	14.4 µg/m³	24h	21
2026-07-14	47	38–53	11.3 µg/m³	24h	22
2026-07-13	48	34–62	11.9 µg/m³	24h	20
2026-07-12	47	34–117	11.8 µg/m³	24h	21
2026-07-11	27	18–38	6.5 µg/m³	24h	20
2026-07-10	28	19–43	6.6 µg/m³	24h	23
2026-07-09	33	23–50	7.8 µg/m³	24h	20
2026-07-08	32	23–44	7.7 µg/m³	21h	23

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