Cal Fire said the maps are proactive, to be used in wildland-urban interface building standards for new construction and natural hazard real estate disclosures at the time of sale.

Some cities had fewer acres in the very high risk designation, but most of the region had more high risk acreage.

More than 3.5 million additional acres across Southern California, including Los Angeles County, have been designated as fire hazard zones under updated maps released on Monday by the California Department of Forestry and Fire Protection (Cal Fire).