BOULDER CREEK, Calif. - Twin wildfires fueled by dry vegetation and hot, windy weather have continued to grow in Northern California and some of that smoke is making its way into the Santa Cruz Mountains.
California fire officials said Monday that the two fires about 100 miles (161 kilometers) north of San Francisco were 30 percent contained and have scorched 428 square miles (1,108 square kilometers).
The two fires are burning about 14 miles (22 kilometers) apart and have destroyed 75 homes. Another 9,000 buildings are threatened.
The two fires cover an area larger than a deadly wildfire burning near Redding, California.
That blaze has killed two firefighters and five civilians and destroyed more than 1,000 homes.
The wildfire started two weeks ago by sparks from the steel wheel of a towed-trailer's flat tire. It is 45 percent contained.
Boulder Creek Volunteer Fire Department posted a drift smoke advisory to Facebook letting residents in the area know that the smoke is expected to linger for the next several days.
Fire officials said, "There is no need to report the smoke unless you see a defined column or flames."
Boulder Creek Fire said folks with respiratory problems or decreased immune systems shouldn't participate in outdoor activities.