What is the air quality trend in Katori-shi?

Over the past 3 days, Katori-shi had an average AQI of 33 based on station measurements. The worst day was 2026-10-20 with AQI 40.

How is Katori-shi air quality measured?

Air quality in Katori-shi 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 Katori-shi, Japan

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

Historical PM2.5 and AQI trend from monitoring stations near Katori-shi, Japan.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 24 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-22	26	19–33	6.2 µg/m³	11h	22
2026-10-21	35	27–51	8.5 µg/m³	24h	26
2026-10-20	40	33–52	9.7 µg/m³	10h	27

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