From County of Santa Clara Public Health Department:

The air quality for portions of Santa Clara County is currently in the Unhealthy and Unhealthy for Sensitive Groups range, which is expected to continue through Tuesday. When air quality is unhealthy, everybody, especially people with heart or lung disease, older adults, children, and teens, should avoid strenuous outdoor activities, keep outdoor activities short, or consider moving them indoors. Be sure to reduce activity level if you experience any unusual coughing, chest discomfort, wheezing, breathing difficulty, or unusual fatigue. Due to current fire conditions in the Bay Area, the air quality is subject to change – visit http://bit.ly/SCC-AirNow for updates.