Stay updated with real-time air quality in Grass Valley, 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)
38
Good
Grass Valley, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
7.45 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
31.95 μg/m³
0
55
155
255
425
605+
18.57 ppb
0
55
71
86
201
201+
0.46 ppb
0
36
76
186
605
1005+
2.69 ppb
0
54
101
361
1250
2050+
0.26 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Grass Valley, California
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AQI 27
Good
4.83μg/m³
PM2.5
21.34μg/m³
PM10
24.73ppb
O3
0.48ppb
SO2
3.03ppb
NO2
0.26ppm
CO
AQI 27
Good
4.96μg/m³
PM2.5
21.70μg/m³
PM10
24.45ppb
O3
0.48ppb
SO2
3.03ppb
NO2
0.25ppm
CO
AQI 33
Good
6.43μg/m³
PM2.5
27.34μg/m³
PM10
17.91ppb
O3
0.52ppb
SO2
3.40ppb
NO2
0.23ppm
CO
AQI 27
Good
4.53μg/m³
PM2.5
14.62μg/m³
PM10
19.18ppb
O3
0.49ppb
SO2
3.81ppb
NO2
0.29ppm
CO
AQI 27
Good
4.58μg/m³
PM2.5
14.84μg/m³
PM10
19.15ppb
O3
0.49ppb
SO2
3.81ppb
NO2
0.29ppm
CO
AQI 22
Good
4.50μg/m³
PM2.5
14.09μg/m³
PM10
19.02ppb
O3
0.49ppb
SO2
3.98ppb
NO2
0.29ppm
CO
Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Grass Valley, California is updated every hour for accuracy.
In the past 24 hours, the air quality in Grass Valley, California was at its worst at 06:00:00 on 2026-03-04.
In the last 24 hours, the best air quality in Grass Valley, California was observed at 12:00:00 on 2026-03-03.
As of now, the AQI in Grass Valley, California is 38, indicating Good conditions.
Grass Valley, California air has the highest levels of PM2.5.
Poor air quality in Grass Valley, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Grass Valley, California are currently 7.453 μg/m3.
The PM10 concentration in Grass Valley, California is 31.945 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Grass Valley, California is 0.256 ppm.
Currently, Grass Valley, California has a sulfur dioxide (SO2) concentration of 0.459 ppb.
The current ozone (O3) level in Grass Valley, California at the moment is 18.57 ppm.
Nitrogen dioxide (NO2) level in Grass Valley, California at the moment is 2.686 ppb.
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