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Iida (Nagano) (JP)

Air Quality Trend (last 7 days)

Good (0-50)
Moderate (51-100)
Unhealthy for Sensitive Groups (101-150)
Unhealthy (151-200)
Very Unhealthy (201-300)
Hazardous (300+)

Weather - 48h MET Norway

ضباب
9°C
ضباب
Humidity
94.2%
Wind
1 m/s
Pressure
1009.4 hPa
Direction
299°
Sunrise
05:00
Sunset
17:00
24h Forecast:
Temp.
6° / 19°
Precip.
0.6mm
Max wind
5.7 m/s

Hourly Forecast

27.02
Now
Weather
27.02
13:00
Weather
27.02
14:00
Weather
0.1
27.02
15:00
Weather
0.3
27.02
16:00
Weather
0.2
27.02
17:00
Weather
27.02
18:00
Weather
27.02
19:00
Weather
27.02
20:00
Weather
27.02
21:00
Weather
27.02
22:00
Weather
27.02
23:00
Weather
28.02
00:00
Weather
12°
28.02
01:00
Weather
15°
28.02
02:00
Weather
17°
28.02
03:00
Weather
18°
28.02
04:00
Weather
19°
28.02
05:00
Weather
19°
28.02
06:00
Weather
18°
5
28.02
07:00
Weather
15°
6
28.02
08:00
Weather
13°
28.02
09:00
Weather
10°
28.02
10:00
Weather
28.02
11:00
Weather

Temperature

19°C
6°C
12:00
9°C
13:00
7°C
14:00
7°C
15:00
7°C
16:00
8°C
17:00
8°C
18:00
8°C
19:00
7°C
20:00
7°C
21:00
6°C
22:00
6°C
23:00
8°C
00:00
12°C
01:00
15°C
02:00
17°C
03:00
18°C
04:00
19°C
05:00
19°C
06:00
18°C
07:00
15°C
08:00
13°C
09:00
10°C
10:00
8°C
11:00
7°C
12:00 23:00 11:00

Precipitation

0.3mm
0mm
14:00
0.1mm
15:00
0.3mm
16:00
0.2mm
12:00 23:00 11:00

Wind

5.7m/s
0m/s
12:00
1.3 m/s
13:00
1.6 m/s
14:00
2 m/s
15:00
2 m/s
16:00
2 m/s
17:00
2.2 m/s
18:00
2.7 m/s
19:00
2.5 m/s
20:00
2.8 m/s
21:00
2.3 m/s
22:00
2.5 m/s
23:00
2.3 m/s
00:00
2 m/s
01:00
2.6 m/s
02:00
3 m/s
03:00
2.9 m/s
04:00
3.2 m/s
05:00
3.8 m/s
06:00
5.2 m/s
07:00
5.7 m/s
08:00
4.3 m/s
09:00
3.5 m/s
10:00
3.2 m/s
11:00
3.3 m/s
12:00 23:00 11:00

Radiation

No sensor within 100 km.

We display the worst measurements from all stations in the area. This approach provides a more cautious assessment of air quality, accounting for local pollution sources.

AQI
91.1 km
158
52.7%

Measurement time: 2026-02-27 12:00

Calculated from PM2.5/PM10

PM2.5
91.1 km
70 µg/m3
83.3%

Measurement time: 2026-02-27 12:00

source: Aqicn

NO2
66.5 km
46.24 µg/m3
23.1%

Measurement time: 2026-02-27 12:45

source: OpenWeatherMap

O3
65.4 km
28.1 µg/m3
17.6%

Measurement time: 2026-02-27 11:00

source: Aqicn

PM10
91.1 km
22 µg/m3
15.7%

Measurement time: 2026-02-27 12:00

source: Aqicn

CO
66.5 km
0.26264 mg/m3
1.9%

Measurement time: 2026-02-27 12:45

source: OpenWeatherMap

SO2
66.5 km
4.82 µg/m3
1.4%

Measurement time: 2026-02-27 12:45

source: OpenWeatherMap

Info


Country: Japan
Region: Nagano
Latitude: 35.51965
Longitude: 137.82074


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About Air Quality in Iida

Air quality in Iida is monitored in real-time by sensors and measurement stations. On this page you'll find current data on major air pollutants including particulate matter PM2.5 and PM10, nitrogen dioxide (NO2), ozone (O3), and radiation levels.

Common Pollutants in Iida

  • PM2.5 - fine particulate matter up to 2.5 micrometers, particularly harmful to health
  • PM10 - particulate matter up to 10 micrometers from traffic and industry
  • NO2 - nitrogen dioxide mainly emitted by vehicles
  • O3 - tropospheric ozone formed in photochemical reactions

When is Air Quality Best in Iida?

Generally, the best air quality occurs:

  • Early morning (5:00-7:00 AM) before rush hour traffic
  • After rainfall which cleanses the atmosphere
  • During strong winds that disperse pollutants
  • In summer months when heating systems are less used

Tips for Runners in Iida

If you're planning outdoor activities in Iida, always check the current AQI value. When AQI exceeds 100, consider moving your workout indoors or shortening the distance. People with respiratory issues, children, and seniors should be especially cautious during elevated pollution levels. Choose routes away from busy streets and industrial areas.