What is the air quality trend in Yoichi?

Over the past 15 days, Yoichi had an average AQI of 52 based on station measurements. The worst day was 2026-10-13 with AQI 91.

How is Yoichi air quality measured?

Air quality in Yoichi 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 Yoichi, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

321h

PM2.5 Station

321h · 4 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	32	11–54	7.7 µg/m³	10h	4
2026-10-20	44	3–151	12.3 µg/m³	24h	3
2026-10-19	37	8–93	9.7 µg/m³	23h	3
2026-10-18	37	24–101	9.4 µg/m³	24h	3
2026-10-17	39	18–68	9.8 µg/m³	24h	2
2026-10-16	62	25–149	18.3 µg/m³	22h	2
2026-10-15	53	10–165	17.1 µg/m³	23h	2
2026-10-14	71	10–161	23.8 µg/m³	20h	2
2026-10-13	91	30–500	49.8 µg/m³	23h	2
2026-10-12	57	28–165	18.1 µg/m³	23h	2
2026-10-11	75	30–161	24.9 µg/m³	22h	2
2026-10-10	41	13–125	10.5 µg/m³	24h	3
2026-10-09	68	19–342	28.5 µg/m³	23h	3
2026-10-08	36	13–55	8.7 µg/m³	24h	5
2026-10-07	46	10–81	12.1 µg/m³	12h	4

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