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Lake Forest (California) (US)

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

Clear sky
22°C
Clear sky
Humidity
36.3%
Wind
1 m/s
Pressure
1015.8 hPa
Direction
235°
Sunrise
05:00
Sunset
17:00
24h Forecast:
Temp.
12° / 22°
Precip.
0mm
Max wind
3.4 m/s

Hourly Forecast

02.02
Now
Weather
22°
02.02
01:00
Weather
20°
02.02
02:00
Weather
18°
02.02
03:00
Weather
16°
02.02
04:00
Weather
15°
02.02
05:00
Weather
15°
02.02
06:00
Weather
15°
02.02
07:00
Weather
15°
02.02
08:00
Weather
14°
02.02
09:00
Weather
14°
02.02
10:00
Weather
13°
02.02
11:00
Weather
13°
02.02
12:00
Weather
13°
02.02
13:00
Weather
12°
02.02
14:00
Weather
12°
02.02
15:00
Weather
12°
02.02
16:00
Weather
14°
02.02
17:00
Weather
18°
02.02
18:00
Weather
20°
02.02
19:00
Weather
21°
02.02
20:00
Weather
22°
02.02
21:00
Weather
22°
02.02
22:00
Weather
22°
02.02
23:00
Weather
22°

Temperature

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

Precipitation

0mm
0mm
00:00 11:00 23:00

Wind

3.4m/s
0m/s
00:00
1.3 m/s
01:00
1.4 m/s
02:00
2.2 m/s
03:00
3.4 m/s
04:00
3.1 m/s
05:00
2.1 m/s
06:00
1.8 m/s
07:00
2 m/s
08:00
1.6 m/s
09:00
1.4 m/s
10:00
1.2 m/s
11:00
1 m/s
12:00
1.3 m/s
13:00
1.4 m/s
14:00
1.1 m/s
15:00
1.6 m/s
16:00
1.5 m/s
17:00
1 m/s
18:00
1.3 m/s
19:00
1.6 m/s
20:00
2 m/s
21:00
2.1 m/s
22:00
2.3 m/s
23:00
2.4 m/s
00:00 11:00 23:00

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
40.2 km
112
37.3%

Measurement time: 2026-02-01 22:49

Calculated from PM2.5/PM10

O3
40.2 km
113.05 µg/m3
70.7%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

PM2.5
40.2 km
40.02 µg/m3
47.6%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

PM10
40.2 km
52.26 µg/m3
37.3%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

NO2
40.2 km
7.93 µg/m3
4%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

CO
40.2 km
0.36617 mg/m3
2.6%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

SO2
40.2 km
0.85 µg/m3
0.2%

Measurement time: 2026-02-01 22:49

source: OpenWeatherMap

About Air Quality in Lake Forest

Air quality in Lake Forest 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 Lake Forest

  • 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 Lake Forest?

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 Lake Forest

If you're planning outdoor activities in Lake Forest, 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.