A battalion chief from Kern County involved in the Canyon fire operations was seriously injured when his truck rolled over.

An air quality alert was issued for parts of Southern California because of the effects of the Canyon Fire, fueled by dry brush and extremely high temperatures.

California officials warned of hot, dry weather that could contribute to “rapid” fire growth and “significant fire behavior.”

The warnings were lifted as of 7 a.m. August 9, according to the Los Angeles County Fire Department. Evacuation orders in the county had been downgraded to warnings on Friday. Evacuation warnings in Ventura County have also been lifted, according to the Ventura County Fire Department. Containment of the fire was at 28%, according to Cal Fire.

Firefighters Friday were trying to make progress after the Canyon fire exploded to nearly 5,000 acres, forcing thousands of residents in northern Los Angeles and eastern Ventura counties to evacuate.