Air Quality in Karuizawa, Japan

Rain
18.4°C · 96.8% humidity
18.4°
Feels 18.4°
59
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast
27 6am
27
25
59 9am
49
42
38 12pm
34
31
30 3pm
28
27
29 6pm
35
55
55 9pm
54
54
54 12am
54
34
34 3am
34
34
AD 728×90

Air Quality Index Trend

47h · 5 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 1.1× the WHO 24-hour guideline of 15 µg/m³.

96.8%
Humidity
20.5 km/h
Wind ESE
1004.3 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
59
15.9 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Karuizawa?

Temperature & Precipitation

PM2.5 Trend

47h · 5 stations
PM2.515.9 µg/m³ ×1.1 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX12.9
Extreme
AD 300×250
Station readings (1 station within 25 km)
15.9
Median
15.9
Average
15.9
Low
15.9
High
PM2.5 µg/m³ · Model: 9.75 · Bias: -6.2

What is the 7-day forecast for Karuizawa?

07-22
23.9° 16.0°
7.38 mm
07-23
21.1° 13.9°
2.06 mm
07-24
20.8° 16.9°
3.31 mm
07-25
24.2° 15.4°
8.38 mm
07-26
25.5° 16.0°
0.75 mm
07-27
22.2° 17.4°
3.69 mm
07-28
24.1° 18.4°
2.69 mm
Both models agree Avg diff: 2.6°C

Where are air quality stations near Karuizawa?

61
Atobe, Saku, Nagano, Japan (佐久佐久市)
20.4 km PM2.5: 16.9 µg/m³
13
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 3.1 µg/m³
82
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 26.8 µg/m³
23
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 5.5 µg/m³
61
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: 16.9 µg/m³
53
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: 13.1 µg/m³

What cities are near Karuizawa?

59 Miyota 61 Komoro 63 Saku 52 Annaka 61 Tōmi 57 Tomioka 66 Ueda 25 Nakanojō 63 Kamimaruko 36 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 2026-07-22T00:24 UTC.