Air near Grass Valley 4 PM - 5 PM PST
PM2.5
N/A
μg/m³

OZONE
32
ppb

Map sites near Grass Valley
Good
Hazardous
Check your local air district website for air quality alerts where you live.
  • Inhalable Particles:
    U.S. EPA 24-hour Average (μg/m³)
  • 0-12.0
    Good
  • 12.1-35.4
    Moderate
  • 35.5-55.4
    USG*
  • 55.5-150.4
    Unhealthy
  • 150.5-250.4
    Very Unhealthy
  • 250.5+
    Hazardous
  • Ozone:
    U.S. EPA 8-hour Average (ppb)
  • 0-54
    Good
  • 55-70
    Moderate
  • 71-85
    USG*
  • 86-105
    Unhealthy
  • 106-200
    Very Unhealthy
  • 200+
    Hazardous
*USG: Unhealthy for Sensitive Groups. This range and above exceeds federal clean air standards.

Air Quality Now