What is the air quality trend in Shimonoseki?

Over the past 21 days, Shimonoseki had an average AQI of 52 based on station measurements. The worst day was 2026-10-14 with AQI 82.

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

477h

PM2.5 Station

477h · 20 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	40	18–112	11.5 µg/m³	7h	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	82	30–171	27.9 µg/m³	24h	16
2026-10-13	66	39–108	19.4 µg/m³	24h	15
2026-10-12	58	37–93	15.9 µg/m³	24h	16
2026-10-11	72	38–189	24.4 µg/m³	24h	13
2026-10-10	65	38–107	19.2 µg/m³	24h	18
2026-10-09	59	25–166	18.4 µg/m³	24h	17
2026-10-08	35	24–45	8.3 µg/m³	24h	26
2026-10-07	39	27–51	9.4 µg/m³	24h	25
2026-10-06	37	24–52	9.0 µg/m³	24h	25
2026-10-05	36	25–49	8.7 µg/m³	24h	24
2026-10-04	37	21–52	8.8 µg/m³	24h	25
2026-10-03	36	29–48	8.7 µg/m³	24h	24
2026-10-02	32	25–42	7.6 µg/m³	24h	24
2026-10-01	40	32–50	9.5 µg/m³	14h	24

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