FOREST RANCH, Calif. (AP) — Wildfires across the western United States and Canada put millions of people under air quality alerts on Sunday as thousands of firefighters battled the flames, including the largest wildfire in California this year.

The so-called Park Fire had scorched an area greater than the size of Los Angeles as of Sunday, darkening the sky with smoke and contributing poor air quality to a large swath of the northwestern U.S. and western Canada. The blaze spanned more than 562 square miles (1,455 square kilometers) of inland Northern California.

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