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Wildfires have forced evacuations for visitors and staff at two national parks in the U.S. West as the summer monsoon season brings increased lightning to the arid region.

Much of the Upper Midwest on Saturday was dealing with swaths of unhealthy air due to drifting smoke from Canadian wildfires, ...

A wildfire that has scorched more than 19,000 acres has forced visitors, employees and residents of the Grand Canyon North Rim to evacuate.

Officials evacuated Jacob Lake and the North Rim of the Grand Canyon was closed to visitors because of the fast-moving White ...