Firefighters continued to make gains Thursday on the Wye fire in Lake and Colusa counties, with full containment expected Sunday, a day earlier than previous estimates, officials said.
Cal Fire reported 755 firefighters were battling the remnants of the blaze, following the release of about 470 firefighters, who were dispatched to other fires in California, spokeswoman Cherie Alver said.
The fire, which broke out Sunday in two locations, is now 85 percent contained, up from 70 percent on Wednesday.
No structures are threatened and all evacuation orders have been lifted.
"That's encouraging," Alver said.
Work on Thursday involved strengthening control lines around the blaze, which has burned nearly 8,000 acres. Mop-up efforts will continue for several days, Alver said.
Winds of 10 to 15 mph were blowing out of the west on Thursday, the same direction but a bit stronger than on Wednesday.
Temperatures in the 101- to 105-degree range were forecast.
Air quality conditions in the Lake County basin improved, with the wind pushing smoke out of the area, the Lake County Air Quality Management District said.
The agency forecast "good" air quality for most of Lake County, but said areas near the active fire may experience "moderate" to "unhealthy" air intermittently during the day. The greatest concern is in Clearlake Oaks, Spring Valley and portions of Clearlake.