What is the air quality trend in Hirai?

Over the past 3 days, Hirai had an average AQI of 13 based on station measurements. The worst day was 2026-08-08 with AQI 19.

How is Hirai air quality measured?

Air quality in Hirai 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 Hirai, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

14h

PM2.5 Station

14h · 2 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	19	19–19	4.5 µg/m³	—	1h	2
2026-08-07	10	1–27	2.5 µg/m³	1.3	6h	1
2026-08-06	11	1–40	2.6 µg/m³	3.9	7h	1

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