Hourly Weather | Today Monday, December 29, 2025
San Mateo, California
10 PM
Night
46°
Feels Like 43°
0
Humidity: 74%
Wind: 6 mph
UV Index: 0
11 PM
Night
45°
Feels Like 43°
0
Humidity: 79%
Wind: 7 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

10 PM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.16 µg/m³
  • PM10: 14.59 µg/m³
  • O3: 0.029 ppm
  • NO2: 8.5 ppb
  • SO2: 1 ppb
  • CO: 0.21 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
36 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.69 µg/m³
  • PM10: 15.31 µg/m³
  • O3: 0.028 ppm
  • NO2: 8.7 ppb
  • SO2: 1 ppb
  • CO: 0.22 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.