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Primary air pollutant in the Grass Valley area:
PM2.5 - 66 Moderate
If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.
Other Pollutants:
OZONE - 31 Good
Wednesday, periods of moderate onshore winds will aid dispersion in the Sacramento region. However, ample sunshine and temperatures around 90F will promote ozone production. As a result, ozone levels will be mid-Moderate. Thursday and Friday, an approaching upper-level trough of low pressure will increase vertical mixing. In addition, moderate onshore surface winds each day will disperse pollutants, while cooler temperatures will limit ozone formation. However, sunny skies will be sufficient for ozone development, yielding low-Moderate ozone levels on Thursday and high-Good ozone levels on Friday.
Primary Pollutant: OZONE - 71 Moderate
Primary Pollutant: OZONE - 46 Good
Primary Pollutant: OZONE - 42 Good
Primary Pollutant: OZONE - 44 Good
Primary Pollutant: OZONE - 61 Moderate
Primary Pollutant: OZONE - 67 Moderate
Primary Pollutant: OZONE - 80 Moderate