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Hotaka (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

Heavy rain
10°C
Heavy rain
Humidity
95.7%
Wind
4 m/s
Pressure
1008.9 hPa
Direction
167°
Sunrise
04:00
Sunset
16:00
24h Forecast:
Temp.
10° / 17°
Precip.
31.5mm
Max wind
6.3 m/s

Hourly Forecast

09.04
Now
Weather
10°
1.5
09.04
19:00
Weather
11°
0.9
09.04
20:00
Weather
11°
1.3
09.04
21:00
Weather
12°
0.6
09.04
22:00
Weather
12°
1.4
09.04
23:00
Weather
13°
0.8
10.04
00:00
Weather
14°
0.4
5
10.04
01:00
Weather
15°
0.4
6
10.04
02:00
Weather
16°
0.3
6
10.04
03:00
Weather
17°
3.4
6
10.04
04:00
Weather
16°
4.9
10.04
05:00
Weather
16°
8.6
10.04
06:00
Weather
15°
5.3
10.04
07:00
Weather
15°
1.5
10.04
08:00
Weather
15°
0.2
10.04
09:00
Weather
14°
10.04
10:00
Weather
16°
10.04
11:00
Weather
16°
10.04
12:00
Weather
16°
5
10.04
13:00
Weather
15°
5
10.04
14:00
Weather
15°
10.04
15:00
Weather
15°
10.04
16:00
Weather
15°
10.04
17:00
Weather
15°

Temperature

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

Precipitation

8.6mm
0mm
18:00
1.5mm
19:00
0.9mm
20:00
1.3mm
21:00
0.6mm
22:00
1.4mm
23:00
0.8mm
00:00
0.4mm
01:00
0.4mm
02:00
0.3mm
03:00
3.4mm
04:00
4.9mm
05:00
8.6mm
06:00
5.3mm
07:00
1.5mm
08:00
0.2mm
18:00 05:00 17:00

Wind

6.3m/s
0m/s
18:00
4.1 m/s
19:00
4.3 m/s
20:00
4.8 m/s
21:00
4.9 m/s
22:00
4.7 m/s
23:00
4.9 m/s
00:00
5.4 m/s
01:00
6 m/s
02:00
6.3 m/s
03:00
5.9 m/s
04:00
4.8 m/s
05:00
3.6 m/s
06:00
4.7 m/s
07:00
3 m/s
08:00
2.7 m/s
09:00
3.9 m/s
10:00
4 m/s
11:00
4.5 m/s
12:00
5.2 m/s
13:00
5.1 m/s
14:00
4.7 m/s
15:00
5 m/s
16:00
4.4 m/s
17:00
4.7 m/s
18:00 05:00 17:00

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
36.4 km
107
35.7%

Measurement time: 2026-04-09 18:00

Calculated from PM2.5/PM10

O3
37.7 km
110.53 µg/m3
69.1%

Measurement time: 2026-04-09 19:11

source: OpenWeatherMap

PM2.5
36.4 km
38 µg/m3
45.2%

Measurement time: 2026-04-09 18:00

source: Aqicn

PM10
36.4 km
13 µg/m3
9.3%

Measurement time: 2026-04-09 18:00

source: Aqicn

CO
37.7 km
0.16977 mg/m3
1.2%

Measurement time: 2026-04-09 19:11

source: OpenWeatherMap

NO2
36.4 km
1.9 µg/m3
1%

Measurement time: 2026-04-09 18:00

source: Aqicn

SO2
36.4 km
1.5 µg/m3
0.4%

Measurement time: 2026-04-09 18:00

source: Aqicn

Info


Country: Japan
Region: Nagano
Latitude: 36.3396
Longitude: 137.88254


Solar Energy

Very low
9.8 W/m²
Solar Radiation
Solar Calculator
Calculate energy production for Hotaka

About Air Quality in Hotaka

Air quality in Hotaka 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 Hotaka

  • 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 Hotaka?

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 Hotaka

If you're planning outdoor activities in Hotaka, 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.