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Primary air pollutant in the Valley Ranch area:
PM2.5 - 19 Good
Enjoy your outdoor activities.
Sunday, March 29: Light to moderate westerly to northwesterly winds will develop during the afternoon and evening, dispersing pollutants and leading to Good AQI levels. Monday, March 30: A passing cold front will increase atmospheric mixing. Furthermore, strengthening southwesterly winds will disperse pollutants, allowing AQI levels to remain Good. Tuesday, cooling temperatures aloft will enhance atmospheric mixing. In addition, moderate to gusty westerly to southwesterly winds will disperse pollutants. As a result, AQI levels will continue to be Good. Wednesday and Thursday, as a cold front approaches and moves through the Portola region, rain showers and moderate westerly to southwesterly winds will disperse pollutants, keeping AQI levels Good on both days. Friday, a ridge of high pressure aloft west of the region will reduce mixing. At the surface, calm to light easterly to northeasterly winds during the morning and evening will limit dispersion. However, low pollutant carryover from the previous days will yield high-Good AQI levels.
Primary Pollutant: PM2.5 - 39 Good
Primary Pollutant: PM2.5 - 39 Good
Primary Pollutant: PM2.5 - 33 Good
Primary Pollutant: PM2.5 - 28 Good
Primary Pollutant: PM2.5 - 39 Good
Primary Pollutant: PM2.5 - 44 Good