Hourly Weather | Today Tuesday, January 6, 2026
San Marcos, California
11 PM
Cloudy Night
52°
Feels Like 52°
20
Humidity: 93%
Wind: 5 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.99 µg/m³
  • O3: 0.048 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.