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Primary air pollutant in the Grass Valley area:
OZONE - 36 Good
Enjoy your outdoor activities.
Other Pollutants:
PM2.5 - 36 Good
Saturday, upper-level high pressure passing over northern California will inhibit atmospheric mixing, while calm to light surface winds will reduce dispersion. Furthermore, temperature inversions through the morning and evening hours will confine pollutants to the lower levels of the atmosphere. As a result, particle levels will be low-Moderate. Sunday and Monday, as a low pressure system deepens off the California Coast, atmospheric mixing will increase over the Sacramento region. Additionally, strengthening southerly to southwesterly winds will promote dispersion. Therefore, particle levels will be Good on both days.
Primary Pollutant: PM2.5 - 50 Good
Primary Pollutant: PM2.5 - 39 Good
Primary Pollutant: PM2.5 - 28 Good
Primary Pollutant: PM2.5 - 28 Good
Primary Pollutant: PM2.5 - 33 Good
Primary Pollutant: PM2.5 - 44 Good