Air Quality in Karuizawa, Japan

Rain
18.4°C · 96.8% humidity
18.4°
Feels 18.4°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast
27 7am
25
25
60 10am
50
43
38 1pm
34
32
30 4pm
28
29
36 7pm
55
55
55 10pm
54
54
54 1am
34
34
34 4am
34
34
AD 728×90

Air Quality Index Trend

46h · 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
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
60
16.4 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Karuizawa?

Temperature & Precipitation

PM2.5 Trend

46h · 5 stations
PM2.516.4 µg/m³ ×1.1 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX24.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
16.4
Median
16.4
Average
15.9
Low
16.9
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -9.3

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: 2.5°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
12
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 2.9 µg/m³
57
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 15.0 µg/m³
46
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: 11.0 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?

60 Miyota 62 Komoro 65 Saku 51 Annaka 62 Tōmi 53 Tomioka 65 Ueda 65 Nakanojō 65 Kamimaruko 46 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 2026-07-22T01:21 UTC.