Dozens of wildfires that have been raging across the Pacific Northwest flared up this week, unfurling a blanket of opaque smoke from the Cascades to the coast and raining ash down on cars, streets and people.

The blazes have forced evacuations and prompted the governor of Washington to declare a state of emergency; the skies have turned a disorienting color of brownish-orange, and the air smells of burned wood.

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