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)
44
Good
Fremont, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
7.78 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
35.24 μg/m³
0
55
155
255
425
605+
18.14 ppb
0
55
71
86
201
201+
0.70 ppb
0
36
76
186
605
1005+
7.15 ppb
0
54
101
361
1250
2050+
0.30 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Fremont, California
Fremont, California
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AQI 17
Good
2.00μg/m³
PM2.5
8.72μg/m³
PM10
18.30ppb
O3
0.72ppb
SO2
1.43ppb
NO2
0.16ppm
CO
AQI 17
Good
1.78μg/m³
PM2.5
7.85μg/m³
PM10
17.85ppb
O3
0.70ppb
SO2
1.59ppb
NO2
0.18ppm
CO
AQI 17
Good
2.54μg/m³
PM2.5
10.90μg/m³
PM10
17.86ppb
O3
0.78ppb
SO2
2.61ppb
NO2
0.11ppm
CO
AQI 17
Good
1.87μg/m³
PM2.5
8.28μg/m³
PM10
17.94ppb
O3
0.69ppb
SO2
1.61ppb
NO2
0.19ppm
CO
AQI 17
Good
1.87μg/m³
PM2.5
8.28μg/m³
PM10
17.94ppb
O3
0.69ppb
SO2
1.61ppb
NO2
0.19ppm
CO
AQI 16
Good
0.89μg/m³
PM2.5
4.76μg/m³
PM10
17.23ppb
O3
0.74ppb
SO2
1.46ppb
NO2
0.12ppm
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 11:00:00 on 2025-07-26.
In the last 24 hrs, the best air quality in Fremont, California was observed at 10:00:00 on 2025-07-27.
The current air quality in Fremont, California is 17, categorized as Good based on real-time data.
The most common pollutant in Fremont, California is O3.
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 2.124 μg/m3.
The current PM10 concentration at Fremont, California is 11.592 μg/m3.
The current carbon monoxide (CO) concentration at Fremont, California is 0.205 ppm.
The current sulfur dioxide (SO2) concentration at Fremont, California is 0.629 ppb.
The current ozone (O3) concentration at Fremont, California is 18.445 ppm.
The current nitrogen dioxide (NO2) concentration at Fremont, California is 1.954 ppb.
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