Stay updated with real-time air quality in Fremont, 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)
52
Moderate
Fremont, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
10.35 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
37.57 μg/m³
0
55
155
255
425
605+
16.24 ppb
0
55
71
86
201
201+
0.91 ppb
0
36
76
186
605
1005+
8.33 ppb
0
54
101
361
1250
2050+
0.33 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Fremont, California
Fremont, California
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AQI 58
Moderate
12.80μg/m³
PM2.5
53.27μg/m³
PM10
13.88ppb
O3
0.87ppb
SO2
7.58ppb
NO2
0.39ppm
CO
AQI 52
Moderate
10.36μg/m³
PM2.5
34.88μg/m³
PM10
15.64ppb
O3
0.90ppb
SO2
7.93ppb
NO2
0.33ppm
CO
AQI 54
Moderate
11.04μg/m³
PM2.5
48.64μg/m³
PM10
15.96ppb
O3
0.93ppb
SO2
8.75ppb
NO2
0.37ppm
CO
AQI 54
Moderate
10.55μg/m³
PM2.5
35.18μg/m³
PM10
15.52ppb
O3
0.88ppb
SO2
8.00ppb
NO2
0.32ppm
CO
AQI 54
Moderate
10.55μg/m³
PM2.5
35.18μg/m³
PM10
15.52ppb
O3
0.88ppb
SO2
8.00ppb
NO2
0.32ppm
CO
AQI 44
Good
8.27μg/m³
PM2.5
35.83μg/m³
PM10
19.40ppb
O3
0.86ppb
SO2
10.58ppb
NO2
0.30ppm
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 Fremont, California is updated every hour.
The worst air quality in Fremont, California in the last 24 hours was observed at 12:00:00 on 2026-01-23.
In the last 24 hrs, the best air quality in Fremont, California was observed at 08:00:00 on 2026-01-23.
The current air quality in Fremont, California is 52, categorized as Moderate based on real-time data.
The most common pollutant in Fremont, California is PM2.5.
If the air quality in Fremont, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Fremont, California is 10.35 μg/m3.
The current PM10 concentration at Fremont, California is 37.574 μg/m3.
The current carbon monoxide (CO) concentration at Fremont, California is 0.332 ppm.
The current sulfur dioxide (SO2) concentration at Fremont, California is 0.906 ppb.
The current ozone (O3) concentration at Fremont, California is 16.237 ppm.
The current nitrogen dioxide (NO2) concentration at Fremont, California is 8.332 ppb.
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