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)
33
Good
Fremont, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
5.72 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.91 μg/m³
0
55
155
255
425
605+
27.89 ppb
0
55
71
86
201
201+
0.68 ppb
0
36
76
186
605
1005+
4.97 ppb
0
54
101
361
1250
2050+
0.31 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Fremont, California
Fremont, California
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AQI 33
Good
6.48μg/m³
PM2.5
28.48μg/m³
PM10
28.70ppb
O3
0.86ppb
SO2
4.32ppb
NO2
0.32ppm
CO
AQI 33
Good
6.19μg/m³
PM2.5
26.81μg/m³
PM10
29.27ppb
O3
0.69ppb
SO2
4.30ppb
NO2
0.31ppm
CO
AQI 49
Good
8.88μg/m³
PM2.5
39.21μg/m³
PM10
33.25ppb
O3
0.88ppb
SO2
7.11ppb
NO2
0.33ppm
CO
AQI 33
Good
5.95μg/m³
PM2.5
25.70μg/m³
PM10
29.40ppb
O3
0.68ppb
SO2
4.27ppb
NO2
0.30ppm
CO
AQI 33
Good
5.95μg/m³
PM2.5
25.70μg/m³
PM10
29.40ppb
O3
0.68ppb
SO2
4.27ppb
NO2
0.30ppm
CO
AQI 38
Good
7.46μg/m³
PM2.5
32.79μg/m³
PM10
30.21ppb
O3
0.68ppb
SO2
5.90ppb
NO2
0.38ppm
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 06:00:00 on 2025-06-05.
In the last 24 hrs, the best air quality in Fremont, California was observed at 05:00:00 on 2025-06-06.
The current air quality in Fremont, California is 33, 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 5.716 μg/m3.
The current PM10 concentration at Fremont, California is 24.912 μg/m3.
The current carbon monoxide (CO) concentration at Fremont, California is 0.306 ppm.
The current sulfur dioxide (SO2) concentration at Fremont, California is 0.683 ppb.
The current ozone (O3) concentration at Fremont, California is 27.891 ppm.
The current nitrogen dioxide (NO2) concentration at Fremont, California is 4.973 ppb.
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