What is the air quality trend in Yamaguchi?

Over the past 15 days, Yamaguchi had an average AQI of 41 based on station measurements. The worst day was 2026-10-11 with AQI 68.

How is Yamaguchi air quality measured?

Air quality in Yamaguchi 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 Yamaguchi, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 19 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	29	19–40	7.1 µg/m³	10h	15
2026-10-20	37	20–52	8.9 µg/m³	24h	12
2026-10-19	37	24–69	9.3 µg/m³	24h	10
2026-10-18	34	20–52	8.2 µg/m³	24h	13
2026-10-17	40	19–57	9.6 µg/m³	24h	10
2026-10-16	44	19–74	11.1 µg/m³	24h	9
2026-10-15	36	20–153	9.6 µg/m³	24h	9
2026-10-14	44	16–131	12.0 µg/m³	24h	9
2026-10-13	46	29–115	11.9 µg/m³	24h	9
2026-10-12	45	22–87	11.7 µg/m³	24h	8
2026-10-11	68	26–193	26.0 µg/m³	23h	7
2026-10-10	38	25–78	9.5 µg/m³	24h	8
2026-10-09	47	17–152	13.5 µg/m³	24h	8
2026-10-08	35	18–52	8.3 µg/m³	24h	12
2026-10-07	39	17–54	9.4 µg/m³	12h	12

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