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Friday, moderate to occasionally heavy rain will overspread the Sacramento region, enhancing atmospheric mixing ahead of an approaching cold front. In addition, periods of moderate and gusty south-southeasterly winds will continue to disperse pollutants. Therefore, particle levels will be Good. Saturday, as the front departs the Sacramento region, winds will shift to southwesterly and gradually weaken during the evening, limiting dispersion. However, an upper-level trough of low pressure will remain offshore, aiding vertical mixing, while pollutant carryover from the previous days will be low. Thus, particle levels will remain Good. Sunday, as a surface ridge of high pressure builds across the Sacramento region, light and variable winds will hinder dispersion throughout the day. In addition, a morning temperature inversion will confine pollutants near the surface, while a few rain showers raise relative humidity and promote particle formation. Therefore, particle levels will increase to low-Moderate.
Primary Pollutant: PM2.5 - 44 Good
Primary Pollutant: PM2.5 - 39 Good
Primary Pollutant: PM2.5 - 53 Moderate
Primary Pollutant: PM2.5 - 56 Moderate
Primary Pollutant: PM2.5 - 53 Moderate
Primary Pollutant: PM2.5 - 50 Good