Air Quality in Karuizawa, Japan

Drizzle
14.3°C · 76.8% humidity
14.3°
Feels 14.3°
22
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast
25 6am
25
24
22 9am
25
25
25 12pm
27
34
54 3pm
54
54
54 6pm
34
27
27 9pm
25
25
25 12am
25
25
25 3am
25
25
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 annual guideline of 5 µg/m³.

76.8%
Humidity
40.6 km/h
Wind SE
999.5 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
22
5.3 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Karuizawa?

Temperature & Precipitation

PM2.5 Trend

47h · 5 stations
PM2.55.3 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Station readings (1 station within 25 km)
5.3
Median
5.3
Average
5.3
Low
5.3
High
PM2.5 µg/m³ · Model: 9.65 · Bias: +4.3

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: 2.2°C

Where are air quality stations near Karuizawa?

13
Atobe, Saku, Nagano, Japan (佐久佐久市)
20.4 km PM2.5: 3.1 µg/m³
30
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 7.2 µg/m³
37
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 8.9 µg/m³
9
Ozasa, Gunma, Japan (嬬恋村運動公園吾妻郡嬬恋村)
20.4 km PM2.5: 2.2 µg/m³
35
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: 8.4 µg/m³
15
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: 3.6 µg/m³

What cities are near Karuizawa?

22 Miyota 26 Komoro 30 Saku 23 Annaka 26 Tōmi 23 Tomioka 26 Ueda 38 Nakanojō 30 Kamimaruko 29 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 2026-05-29T00:24 UTC.