Hourly Weather | Today Wednesday, February 25, 2026
San Marcos, California
11 PM
Cloudy Night
54°
Feels Like 54°
0
Humidity: 99%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

11 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.16 µg/m³
  • PM10: 10.54 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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