Firefighters are nearing victory in the battles against three major wildfires near Los Angeles that have burned more than 117,000 acres, destroyed nearly 200 structures and injured 23 people, officials said.

Smoke was heaviest southeast of Los Angeles and widespread across the rest of Southern California. Data from air sensors suggested that the air quality was diminished in several places around the Los Angeles area. Air quality was also poor in the Northwest, including in Oregon and Idaho, where dozens more wildfires were burning.

Wildfires around Los Angeles have burned rapidly in the past week after vegetation growth and record heat blamed on climate change, and Southern California blazes could get worse once seasonal winds start,