Cool and warm air will battle across the Northeast this weekend as more Canadian wildfire smoke degrades air quality.

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

Wildfire smoke has settled thickly in parts of New York, Connecticut, Wisconsin, Michigan and Minnesota—and it’s heading further south.

Heavy smoke from several large wildfires blazing in Canada and Minnesota is expected to engulf large swaths of the Midwest and Northeast U.S. this week.

Wildfires in Canada and Minnesota are sending heavy smoke to the Midwest and Northeast U.S., causing poor air quality alerts.

A massive plume of smoke from wildfires burning across Canada has swept into the United States, degrading air quality across the Midwest, Northeast and Mid-Atlantic.

Over 100 wildfires are burning in Canada, with winds carrying the smoke southeast. Warnings about unhealthy air extend from Minnesota through Toronto and into New York.

Roughly 100 wildfires are raging out of control in Ontario, sending smoke streaming more than 1,000 miles from their origin.

Massive plumes of Canadian wildfire smoke have started to pour over the border into the United States, bringing dangerous air quality to more than 100 million people in the…

A National Weather Service meteorologist said even if winds from the northwest clear skies as expected later this week, the smoky air could keep returning until the fires are out.…

A think blanket of hazardous wildfire smoke spread from the Great Lakes to the East Coast on Thursday, putting millions of Americans at health risk.

Wildfire smoke is causing dangerously bad air across the Midwest and Northeast — and could soon waft elsewhere.

Smoke from Canadian and Minnesota wildfires is expected to keep air quality unhealthy in parts of the Midwest and Northeast on July 17.

Heavy smoke from more than 800 wildfires burning across Canada enveloped a swath of the US from the Midwest to the Northeast on Thursday.

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

Over 120 million people were at risk of dangerous air quality

Forecasters have predicted that the heat and smoke will subside in some areas starting on Friday—but the air quality could worsen yet again this weekend in others.

Cool and warm air will battle across the Northeast this weekend as more Canadian wildfire smoke degrades air quality.

Wildfire smoke and unhealthy air persist and shift direction, as Trump demands explanation from Canada.

Smoke from Canada's wildfires spread across the US Northeast and Great Lakes, triggering unhealthy air alerts, health warnings and travel disruptions.