What is the air quality trend in Hannan?

Over the past 8 days, Hannan had an average AQI of 64 based on station measurements. The worst day was 2026-10-14 with AQI 86.

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

165h

PM2.5 Station

165h · 62 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	41	32–54	10.0 µg/m³	7h	58
2026-10-20	53	32–81	14.2 µg/m³	24h	59
2026-10-19	62	38–85	17.4 µg/m³	24h	56
2026-10-18	43	28–85	10.8 µg/m³	24h	57
2026-10-17	67	31–119	19.9 µg/m³	24h	59
2026-10-16	78	44–153	24.5 µg/m³	24h	49
2026-10-15	86	52–154	28.3 µg/m³	24h	62
2026-10-14	86	31–155	29.0 µg/m³	14h	47

Back to Hannan Air Quality