What is the air quality trend in Shimonoseki?

Over the past 8 days, Shimonoseki had an average AQI of 59 based on station measurements. The worst day was 2026-10-14 with AQI 76.

How is Shimonoseki air quality measured?

Air quality in Shimonoseki 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 Shimonoseki, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 14 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	41	18–112	12.1 µg/m³	6h	19
2026-10-20	47	26–126	12.5 µg/m³	24h	17
2026-10-19	61	28–122	18.2 µg/m³	24h	17
2026-10-18	34	23–55	8.3 µg/m³	24h	16
2026-10-17	67	35–159	20.8 µg/m³	24h	17
2026-10-16	75	34–153	23.7 µg/m³	24h	15
2026-10-15	76	28–174	26.6 µg/m³	24h	16
2026-10-14	76	30–171	26.4 µg/m³	15h	15

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