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)
27
Good
Fremont, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
5.26 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
22.41 μg/m³
0
55
155
255
425
605+
15.18 ppb
0
55
71
86
201
201+
0.68 ppb
0
36
76
186
605
1005+
6.79 ppb
0
54
101
361
1250
2050+
0.34 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Fremont, California
Fremont, California
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AQI 22
Good
4.06μg/m³
PM2.5
16.99μg/m³
PM10
14.89ppb
O3
0.74ppb
SO2
6.24ppb
NO2
0.34ppm
CO
AQI 27
Good
4.80μg/m³
PM2.5
20.09μg/m³
PM10
14.61ppb
O3
0.68ppb
SO2
6.60ppb
NO2
0.35ppm
CO
AQI 44
Good
7.95μg/m³
PM2.5
36.15μg/m³
PM10
17.69ppb
O3
0.74ppb
SO2
8.86ppb
NO2
0.30ppm
CO
AQI 27
Good
4.66μg/m³
PM2.5
19.51μg/m³
PM10
14.25ppb
O3
0.66ppb
SO2
6.57ppb
NO2
0.36ppm
CO
AQI 27
Good
4.66μg/m³
PM2.5
19.51μg/m³
PM10
14.25ppb
O3
0.66ppb
SO2
6.57ppb
NO2
0.36ppm
CO
AQI 27
Good
4.92μg/m³
PM2.5
21.55μg/m³
PM10
17.73ppb
O3
0.79ppb
SO2
6.71ppb
NO2
0.31ppm
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 01:00:00 on 2025-07-14.
In the last 24 hrs, the best air quality in Fremont, California was observed at 12:00:00 on 2025-07-14.
The current air quality in Fremont, California is 27, categorized as Good 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 5.258 μg/m3.
The current PM10 concentration at Fremont, California is 22.41 μg/m3.
The current carbon monoxide (CO) concentration at Fremont, California is 0.341 ppm.
The current sulfur dioxide (SO2) concentration at Fremont, California is 0.681 ppb.
The current ozone (O3) concentration at Fremont, California is 15.177 ppm.
The current nitrogen dioxide (NO2) concentration at Fremont, California is 6.786 ppb.
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