California’s largest wildfire of the year grew to an estimated 70,801 acres Friday, producing smoke that has affected millions of residents across the southern part of the state. The Madre Fire in

The Madre Fire — burning about two hours north of Los Angeles — exploded this week to become the biggest wildfire in California this year. Crews are working 24/7 to protect people and properties. NBC News’ Morgan Chesky reports.

California's Madre Fire sparked in the late evening of July 3 but has since grown to the largest in the state this year by the Fourth.