Air Quality in Karuizawa, Japan
Drizzle
15.9°C · 99.5% humidity
15.9°
Feels 15.9°
21
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
Karuizawa's air quality — share it
AQI Forecast
25
5pm
25
25
21
8pm
23
21
22
11pm
22
23
23
2am
23
24
24
5am
24
24
24
8am
25
25
25
11am
25
25
25
2pm
25
25
Air Quality Index Trend
45h · 10 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.
99.5%
Humidity
26.0 km/h
Wind E
1012.0 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
5.0 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Karuizawa?
Temperature & Precipitation
PM2.5 Trend
45h · 10 stationsPM2.55.0 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
Station readings (2 stations within 25 km)
5.0
Median
5.0
Average
5.0
Low
5.0
High
PM2.5 µg/m³ · Model: 6.25 · Bias: +1.2
What is the 7-day forecast for Karuizawa?
09-05
20.4° 15.9°
4.44 mm
09-06
23.0° 15.8°
4.13 mm
09-07
20.8° 17.0°
3.19 mm
09-08
21.5° 14.6°
13.69 mm
09-09
19.0° 15.5°
1.31 mm
09-10
18.9° 17.1°
5.19 mm
09-11
22.8° 16.4°
2.12 mm
Both models agree
Avg diff: 2.8°C
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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 2026-09-05T11:14 UTC.