Air Quality in Shiojiri, Japan
Rain
20.4°C · 92.8% humidity
20.4°
Feels 20.4°
63
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station
Nearby Monitoring Stations
Shiojiri's air quality — share it
AQI Forecast
34
6am
34
27
63
9am
51
43
38
12pm
34
32
30
3pm
28
28
27
6pm
28
28
35
9pm
54
54
54
12am
54
54
54
3am
54
54
Air Quality Index Trend
40h · 2 stnShiojiri'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 Shiojiri is 1.2× the WHO 24-hour guideline of 15 µg/m³.
92.8%
Humidity
23.5 km/h
Wind S
1003.7 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
17.8 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Shiojiri?
Temperature & Precipitation
PM2.5 Trend
40h · 2 stationsPM2.517.8 µg/m³
×1.2 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
Station readings (1 station within 25 km)
17.8
Median
17.8
Average
17.8
Low
17.8
High
PM2.5 µg/m³ · Model: 7.35 · Bias: -10.4
What is the 7-day forecast for Shiojiri?
07-22
23.7° 16.9°
11.12 mm
07-23
20.1° 10.1°
8.69 mm
07-24
19.4° 17.6°
8.56 mm
07-25
22.5° 14.2°
12.5 mm
07-26
24.3° 16.1°
2.5 mm
07-27
24.2° 14.7°
7.37 mm
07-28
23.0° 16.2°
7.31 mm
Both models agree
Avg diff: 4.9°C
Where are air quality stations near Shiojiri?
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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 2026-07-22T00:21 UTC.