People wear masks while smoke from the Camp Fire fills the air in San Francisco, California, on Thursday, Nov. 15, 2018. The smoke from California's deadliest fire is so thick that its blotting out the sun and lowering surface temperatures by as much as 10 degrees Fahrenheit (6 Celsius), according to the U.S. National Weather Service. (Photo: Michael Short/Bloomberg)

The smoke hovering over the San Francisco Bay Area got thicker on Friday, causing many workers to stay home, or leave the region entirely. Those who stay are stocking up on air purifiers and respirator masks.

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