What is the air quality trend in Kusatsu?

Over the past 8 days, Kusatsu had an average AQI of 52 based on station measurements. The worst day was 2026-07-21 with AQI 57.

How is Kusatsu air quality measured?

Air quality in Kusatsu 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 Kusatsu, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 8 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	51	24–73	14.4 µg/m³	3h	33
2026-07-21	57	48–64	15.0 µg/m³	24h	21
2026-07-20	53	42–59	13.4 µg/m³	24h	28
2026-07-19	47	34–55	11.4 µg/m³	24h	34
2026-07-18	47	32–65	11.8 µg/m³	24h	37
2026-07-17	54	47–66	13.7 µg/m³	24h	33
2026-07-16	56	50–63	14.5 µg/m³	24h	32
2026-07-15	55	40–67	14.2 µg/m³	21h	32

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