What is the air quality trend in Yorii?

Over the past 8 days, Yorii had an average AQI of 50 based on station measurements. The worst day was 2026-07-21 with AQI 59.

How is Yorii air quality measured?

Air quality in Yorii 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 Yorii, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 3 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	52	52–52	12.8 µg/m³	—	1h	3
2026-07-21	59	52–64	15.8 µg/m³	32.2	24h	25
2026-07-20	53	42–59	13.3 µg/m³	21.3	24h	32
2026-07-19	41	25–55	9.9 µg/m³	13.6	24h	34
2026-07-18	42	26–57	10.0 µg/m³	10.3	24h	35
2026-07-17	50	36–59	12.5 µg/m³	26.3	24h	33
2026-07-16	57	48–65	15.1 µg/m³	40.4	24h	33
2026-07-15	52	40–60	13.0 µg/m³	32.5	22h	35

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