Thousands battle Western US wildfires as smoke puts millions under air quality alerts

Forest Ranch, California — Wildfires across the western United States and Canada put millions of people under air quality alerts Sunday as thousands of firefighters battled the flames, including the largest wildfire in California this year. The so-called Park Fire had scorched more than 1,430 square kilometers of land in inland Northern California as of Sunday morning, darkening the sky with smoke and haze and contributing to poor air quality in a large swath of the Northwestern U.S. and western Canada.