What is the air quality trend in Hannan?

Over the past 3 days, Hannan had an average AQI of 49 based on station measurements. The worst day was 2026-10-19 with AQI 59.

How is Hannan air quality measured?

Air quality in Hannan 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 Hannan, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

46h

PM2.5 Station

46h · 52 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	37	29–45	8.8 µg/m³	10h	64
2026-10-20	51	32–104	13.8 µg/m³	24h	59
2026-10-19	59	47–87	15.9 µg/m³	12h	55

Back to Hannan Air Quality