What is the air quality trend in Katsuyama?

Over the past 7 days, Katsuyama had an average AQI of 51 based on station measurements. The worst day was 2026-07-21 with AQI 66.

How is Katsuyama air quality measured?

Air quality in Katsuyama 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 Katsuyama, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

154h

PM2.5 Station

154h · 4 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	66	20–136	19.6 µg/m³	17h	2
2026-07-20	55	36–80	14.5 µg/m³	22h	3
2026-07-19	43	21–71	10.9 µg/m³	23h	3
2026-07-18	46	9–104	12.1 µg/m³	23h	3
2026-07-17	48	30–64	12.2 µg/m³	24h	2
2026-07-16	52	23–71	13.7 µg/m³	23h	3
2026-07-15	48	19–76	12.7 µg/m³	22h	3

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