Stay updated with real-time air quality in Mill 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)
49
Good
Mill Valley, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
9.16 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
40.66 μg/m³
0
55
155
255
425
605+
14.11 ppb
0
55
71
86
201
201+
1.01 ppb
0
36
76
186
605
1005+
6.36 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Mill Valley, California
Mill Valley, California
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AQI 49
Good
8.97μg/m³
PM2.5
39.79μg/m³
PM10
14.04ppb
O3
1.02ppb
SO2
5.88ppb
NO2
0.21ppm
CO
AQI 49
Good
9.23μg/m³
PM2.5
40.98μg/m³
PM10
14.14ppb
O3
1.00ppb
SO2
6.53ppb
NO2
0.24ppm
CO
AQI 49
Good
8.82μg/m³
PM2.5
39.08μg/m³
PM10
14.00ppb
O3
1.02ppb
SO2
5.54ppb
NO2
0.20ppm
CO
AQI 49
Good
8.94μg/m³
PM2.5
39.64μg/m³
PM10
14.03ppb
O3
1.02ppb
SO2
5.81ppb
NO2
0.21ppm
CO
AQI 52
Moderate
10.48μg/m³
PM2.5
46.87μg/m³
PM10
14.01ppb
O3
0.97ppb
SO2
7.27ppb
NO2
0.30ppm
CO
AQI 52
Moderate
10.32μg/m³
PM2.5
45.56μg/m³
PM10
15.89ppb
O3
0.94ppb
SO2
7.47ppb
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 Mill Valley, California is updated every hour.
The worst air quality in Mill Valley, California in the last 24 hours was observed at 10:00:00 on 2026-01-22.
In the last 24 hrs, the best air quality in Mill Valley, California was observed at 04:00:00 on 2026-01-23.
The current air quality in Mill Valley, California is 49, categorized as Good based on real-time data.
The most common pollutant in Mill Valley, California is PM2.5.
If the air quality in Mill Valley, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Mill Valley, California is 9.161 μg/m3.
The current PM10 concentration at Mill Valley, California is 40.657 μg/m3.
The current carbon monoxide (CO) concentration at Mill Valley, California is 0.233 ppm.
The current sulfur dioxide (SO2) concentration at Mill Valley, California is 1.009 ppb.
The current ozone (O3) concentration at Mill Valley, California is 14.109 ppm.
The current nitrogen dioxide (NO2) concentration at Mill Valley, California is 6.356 ppb.
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