Air Quality in Karuizawa, Japan
Rain
13.3°C · 98.7% humidity
13.3°
Feels 13.3°
42
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
AQI Forecast
27
8pm
27
25
42
11pm
37
34
31
2am
29
28
27
5am
27
26
26
8am
26
25
25
11am
25
25
25
2pm
25
25
25
5pm
25
27
Air Quality Index Trend
47h · 6 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. Current PM2.5 concentration in Karuizawa is 2.0× the WHO annual guideline of 5 µg/m³.
98.7%
Humidity
25.3 km/h
Wind NW
1006.8 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
10.1 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Karuizawa?
Temperature & Precipitation
PM2.5 Trend
47h · 6 stationsPM2.510.1 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
Station readings (1 station within 25 km)
10.1
Median
10.1
Average
10.1
Low
10.1
High
PM2.5 µg/m³ · Model: 9.75 · Bias: -0.3
What is the 7-day forecast for Karuizawa?
05-29
15.4° 12.2°
30.94 mm
05-30
17.0° 10.3°
1.13 mm
05-31
17.3° 11.5°
0.25 mm
06-01
18.4° 12.6°
0.31 mm
06-02
17.8° 10.8°
0.69 mm
06-03
19.6° 13.3°
2.25 mm
06-04
19.1° 7.7°
0.56 mm
Both models agree
Avg diff: 1.9°C
Where are air quality stations near Karuizawa?
25
Atobe, Saku, Nagano, Japan (佐久佐久市)
7
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
25
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
53
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
52
Haramachi, Gunma Prefecture, Japan (東吾妻町立東吾妻中学校吾妻郡東吾妻町)
63
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 2026-05-29T14:40 UTC.