Stay updated with real-time air quality in Lake Forest, California featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
39
Good
Lake Forest, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.60 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.05 μg/m³
0
55
155
255
425
605+
42.04 ppb
0
55
71
86
201
201+
0.69 ppb
0
36
76
186
605
1005+
10.27 ppb
0
54
101
361
1250
2050+
0.38 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Very high
Lake Forest, California
Lake Forest, California
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AQI 42
Good
5.36μg/m³
PM2.5
18.27μg/m³
PM10
45.31ppb
O3
0.57ppb
SO2
6.28ppb
NO2
0.39ppm
CO
AQI 42
Good
5.33μg/m³
PM2.5
18.09μg/m³
PM10
45.08ppb
O3
0.57ppb
SO2
5.83ppb
NO2
0.38ppm
CO
AQI 42
Good
5.34μg/m³
PM2.5
18.17μg/m³
PM10
45.20ppb
O3
0.57ppb
SO2
6.05ppb
NO2
0.39ppm
CO
AQI 43
Good
5.79μg/m³
PM2.5
19.72μg/m³
PM10
46.00ppb
O3
0.59ppb
SO2
7.28ppb
NO2
0.38ppm
CO
AQI 42
Good
5.37μg/m³
PM2.5
18.35μg/m³
PM10
45.40ppb
O3
0.58ppb
SO2
6.37ppb
NO2
0.39ppm
CO
AQI 43
Good
5.61μg/m³
PM2.5
19.00μg/m³
PM10
45.88ppb
O3
0.58ppb
SO2
6.22ppb
NO2
0.39ppm
CO
Air quality data and pollutant measurements for California, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Lake Forest, California is updated every hour.
The worst air quality in Lake Forest, California in the last 24 hours was observed at 03:00:00 on 2026-04-24.
In the last 24 hrs, the best air quality in Lake Forest, California was observed at 11:00:00 on 2026-04-23.
The current air quality in Lake Forest, California is 39, categorized as Good based on real-time data.
The most common pollutant in Lake Forest, California is O3.
If the air quality in Lake Forest, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Lake Forest, California is 5.602 μg/m3.
The current PM10 concentration at Lake Forest, California is 15.046 μg/m3.
The current carbon monoxide (CO) concentration at Lake Forest, California is 0.378 ppm.
The current sulfur dioxide (SO2) concentration at Lake Forest, California is 0.685 ppb.
The current ozone (O3) concentration at Lake Forest, California is 42.039 ppm.
The current nitrogen dioxide (NO2) concentration at Lake Forest, California is 10.265 ppb.
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