What is the air quality trend in Yotsukaidō?

Over the past 8 days, Yotsukaidō had an average AQI of 45 based on station measurements. The worst day was 2026-10-16 with AQI 56.

How is Yotsukaidō air quality measured?

Air quality in Yotsukaidō 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 Yotsukaidō, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 71 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	33	29–36	7.9 µg/m³	12.5	8h	83
2026-10-20	45	33–76	11.1 µg/m³	21.5	24h	76
2026-10-19	47	34–71	11.7 µg/m³	13.4	24h	74
2026-10-18	34	27–50	8.2 µg/m³	8.9	24h	83
2026-10-17	44	30–59	10.6 µg/m³	11.3	24h	75
2026-10-16	56	44–84	14.9 µg/m³	15.4	24h	64
2026-10-15	48	28–84	12.3 µg/m³	11.3	24h	69
2026-10-14	53	25–125	15.2 µg/m³	6.1	13h	61

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