A wildfire in California - (CNN photo)
According to monitoring groups, Northern California's air quality has become the worst in the world as the state battles devastating fires.
Air quality network Purple Air says the air is now worse than smoggy cities in India and China.
Schools have cancelled classes, flights have been delayed, and internet searches for smoke masks are soaring.
At least 63 people have died in the Camp Fire - the state's deadliest and most destructive blaze.
The number of missing people has increased to more than 600 doubling the size of the list in a day.
Three more people have also died in the Woolsey Fire, further south.
President Donald Trump will travel to California on Saturday to survey the damage and meet those affected.
The Camp Fire - which broke out eight days ago - swept through a swathe of the north at high speed, leaving residents little time to escape.
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