What is the air quality trend in Katori-shi?

Over the past 8 days, Katori-shi had an average AQI of 39 based on station measurements. The worst day was 2026-10-16 with AQI 49.

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

166h

PM2.5 Station

166h · 32 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	32	28–36	7.7 µg/m³	10h	37
2026-10-20	38	27–57	9.2 µg/m³	24h	33
2026-10-19	40	33–59	9.8 µg/m³	24h	31
2026-10-18	33	23–49	8.0 µg/m³	24h	34
2026-10-17	40	32–51	9.5 µg/m³	24h	30
2026-10-16	49	35–79	12.5 µg/m³	24h	27
2026-10-15	40	24–149	10.5 µg/m³	24h	28
2026-10-14	46	24–132	13.1 µg/m³	12h	26

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