Home > USA > California > Nevada County > Grass Valley
Primary air pollutant in the Grass Valley area:
PM2.5 - 55 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 - 20 Good
Thursday and Friday, as a trough of low pressure aloft gradually moves across northern California, low-level mixing will be enhanced. In addition, high temperatures in the 70s and partly cloudy skies will limit ozone development each day. Therefore, ozone levels will be Good on both days. Saturday, moderate onshore surface winds will aid pollutant dispersion as another trough of low pressure aloft traverses the region. However, increasing sunshine and temperatures warming into the mid-80s will promote ozone formation. Thus, ozone levels will be low-Moderate.
Primary Pollutant: OZONE - 41 Good
Primary Pollutant: OZONE - 44 Good
Primary Pollutant: OZONE - 51 Moderate
Primary Pollutant: OZONE - 61 Moderate
Primary Pollutant: OZONE - 67 Moderate
Primary Pollutant: OZONE - 84 Moderate