What is the air quality trend in Sayō?

Over the past 8 days, Sayō had an average AQI of 51 based on station measurements. The worst day was 2026-10-16 with AQI 66.

How is Sayō air quality measured?

Air quality in Sayō 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 Sayō, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 19 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	43	34–52	10.4 µg/m³	7h	19
2026-10-20	44	22–93	11.4 µg/m³	24h	18
2026-10-19	50	27–103	13.1 µg/m³	24h	17
2026-10-18	33	20–54	7.8 µg/m³	24h	17
2026-10-17	52	33–81	13.7 µg/m³	24h	17
2026-10-16	66	42–125	19.4 µg/m³	24h	15
2026-10-15	59	30–162	17.8 µg/m³	24h	17
2026-10-14	62	27–145	18.6 µg/m³	14h	15

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