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On Monday, the smoke from Canada prompted a ground stop at Boston's Logan International Airport due to \"low visibility\" and caused delays in airport operations that extended into the afternoon, according to the Federal Aviation Administration.

Air quality in Michigan, including the city of Detroit, remained unhealthy for sensitive groups on Tuesday.

Smoke from the Canadian fires are forecast to be medium to heavy through Wednesday from Duluth, Minnesota, to Buffalo, New York, and through New York's Hudson Valley.

Meanwhile, wildfires burning in U.S. Western states were prompting red flag fire danger warnings on Tuesday. Red flag warnings remain in place for parts of Nevada, Utah, Colorado and Wyoming due to very dry conditions, low humidity and gusty winds that could rapidly spread new fires.

One of the biggest active wildfires is burning in Southern California's Santa Barbara and San Luis Obispo counties. As of Tuesday morning, the Gifford Fire, which started on Sunday, had burned more than 82,500 acres across Santa Barbara and San Luis Obispo counties and was just 7% contained, according to the California Department of Forestry and Fire Protection.

Wildfires burning in the West are creating smoky skies for millions from Southern California to Colorado.

The FAA announced that it was slowing flights into Denver International Airport due to smoke and low visibility. The Harry Reid International Airport in Las Vegas also had a brief slowdown in air traffic on Tuesday morning, but it has since been lifted.

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