What is the air quality trend in Sayō?

Over the past 15 days, Sayō had an average AQI of 30 based on station measurements. The worst day was 2026-08-31 with AQI 38.

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

333h

PM2.5 Station

333h · 14 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	25	18–32	5.9 µg/m³	17h	15
2026-09-04	21	12–32	5.0 µg/m³	24h	14
2026-09-03	21	12–35	5.0 µg/m³	24h	12
2026-09-02	28	20–85	7.1 µg/m³	24h	12
2026-09-01	29	13–75	7.2 µg/m³	24h	12
2026-08-31	38	21–158	10.9 µg/m³	24h	9
2026-08-30	37	21–157	10.1 µg/m³	24h	12
2026-08-29	27	18–42	6.5 µg/m³	24h	11
2026-08-28	32	20–57	7.8 µg/m³	24h	14
2026-08-27	27	17–48	6.5 µg/m³	24h	12
2026-08-26	32	20–51	7.7 µg/m³	24h	13
2026-08-25	32	21–57	7.8 µg/m³	24h	15
2026-08-24	36	21–49	8.7 µg/m³	24h	13
2026-08-23	36	20–52	8.6 µg/m³	24h	14
2026-08-22	35	20–52	8.4 µg/m³	4h	14

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