A Spare the Air weekend will continue at least through Sunday, according to the Bay Area Air Quality Management District.
The district, which was also declared an alert Saturday, forecast concentrations of ground-level ozone pollution that will be unhealthy. Residents are encouraged to drive less and reduce their energy use to lower the levels of pollution.
A heat wave expected to send temperatures as high as 95 degrees in some parts of the East Bay is a contributing factor, the district said.
The district advises young children, seniors and those with respiratory and heart conditions to ease up on their activity outside, limiting most of it to the morning.
Rick Hurd covers public safety. Contact him at 925-945-4780 and follow him at Twitter.com/3rdERH.