Air Quality in Nagano, Japan
Heavy Rain
22.4°C · 85.6% humidity
22.4°
Feels 22.4°
74
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
3 stations
Nearby Monitoring Stations
Nagano's air quality — share it
AQI Forecast
25
7am
27
27
74
10am
60
50
43
1pm
38
36
34
4pm
32
30
29
7pm
36
35
55
10pm
55
54
34
1am
27
27
27
4am
27
27
Air Quality Index Trend
45h · 2 stnNagano'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 Nagano is 1.5× the WHO 24-hour guideline of 15 µg/m³.
85.6%
Humidity
42.7 km/h
Wind SSW
1002.3 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
22.95 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Nagano?
Temperature & Precipitation
PM2.5 Trend
45h · 2 stationsPM2.522.95 µg/m³
×1.5 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX19.9
Extreme
Station readings (3 stations within 25 km)
22.95
Median
21.3
Average
18.8
Low
23.0
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -16.7
What is the 7-day forecast for Nagano?
07-22
31.4° 19.6°
16.0 mm
07-23
27.5° 14.5°
0.81 mm
07-24
25.9° 22.0°
2.19 mm
07-25
26.4° 18.9°
17.12 mm
07-26
28.1° 19.3°
0.62 mm
07-27
30.0° 18.9°
3.62 mm
07-28
25.5° 21.0°
10.81 mm
Both models agree
Avg diff: 2.4°C
Where are air quality stations near Nagano?
65
Nagano (長野)
76
Nagano (長野)
25
Amori, Nagano, Nagano, Japan (環境保全研究所長野市)
6
Shinonoifusetakada, Nagano, Nagano Prefecture, Japan (篠ノ井長野市)
8
Shinonoifusetakada, Nagano, Nagano Prefecture, Japan (篠ノ井長野市)
What cities are near Nagano?
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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 2026-07-22T01:19 UTC.