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
AD 728×90

Air Quality Index Trend

47h · 6 stn

Karuizawa'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▲
42
10.1 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Karuizawa?

Temperature & Precipitation

PM2.5 Trend

47h · 6 stations
PM2.510.1 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
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)
20.4 km PM2.5: 6.0 µg/m³
7
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 1.7 µg/m³
25
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 6.0 µg/m³
53
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 13.1 µg/m³
52
Haramachi, Gunma Prefecture, Japan (東吾妻町立東吾妻中学校吾妻郡東吾妻町)
29.9 km PM2.5: 12.6 µg/m³
63
Haramachi, Gunma Prefecture, Japan (東吾妻町立東吾妻中学校吾妻郡東吾妻町)
29.9 km PM2.5: 17.8 µg/m³

What cities are near Karuizawa?

42 Miyota 42 Komoro 34 Saku 24 Annaka 42 Tōmi 24 Tomioka 30 Ueda 47 Nakanojō 37 Kamimaruko 33 Kanekomachi
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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.