Air Quality in Karuizawa, Japan
Drizzle
18.0°C · 99.4% humidity
18.0°
Feels 18.0°
34
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Karuizawa's air quality — share it
AQI Forecast
Calibrated
0
9am
0
0
34
12pm
32
23
17
3pm
21
8
6
6pm
4
12
2
9pm
2
1
1
12am
1
0
0
3am
0
0
0
6am
0
0
Station readings
49h ago
AQI 21
PM2.5 5.0 µg/m³ · 49h ago
Air Quality Index Trend
42h · 12 stnKaruizawa's air quality is influenced by industrial emissions, vehicle traffic, and regional pollution transport. Winter heating season and spring dust events typically create the most challenging air quality conditions.
99.4%
Humidity
20.9 km/h
Wind E
1011.9 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
8.2 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Karuizawa?
Temperature & Precipitation
PM2.5 Trend
42h · 12 stationsPM2.58.2 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.2
Moderate
Station readings (1 station within 25 km)
8.2
Median
8.2
Average
8.2
Low
8.2
High
PM2.5 µg/m³ · Model: 6.0 · Bias: -2.2
What is the 7-day forecast for Karuizawa?
08-03
20.8° 18.0°
9.75 mm
08-04
26.8° 18.5°
3.94 mm
08-05
22.2° 18.6°
3.38 mm
08-06
20.6° 17.5°
70.44 mm
08-07
24.1° 18.5°
9.88 mm
08-08
24.7° 19.2°
54.25 mm
08-09
24.0° 15.7°
1.75 mm
Both models agree
Avg diff: 2.4°C
Where are air quality stations near Karuizawa?
42
Atobe, Saku, Nagano, Japan (佐久佐久市)
17
Atobe, Saku, Nagano, Japan (佐久佐久市)
34
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
13
Tomioka, Tomioka, Gunma, Japan (富岡市立富岡小学校富岡市)
10
Haramachi, Gunma Prefecture, Japan (東吾妻町立東吾妻中学校吾妻郡東吾妻町)
What cities are near Karuizawa?
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T03:06 UTC.