Wildfires across the western United States and Canada have put millions of people under air quality alerts, as thousands of firefighters battle the flames.

A handful of fires burning east of Humboldt continued to grow overnight with minimal containment, bringing air quality and travel impacts. Parts of State Route 36 have reopened to controlled traffic. Overall hot, dry conditions are expected to complicate fire suppression efforts.

A local firefighter who was killed fighting a fast-moving wildfire was identified Friday as crews continued to battle the blaze in Redding, California.