The haze Pittsburgh-area residents will see in the sky on Tuesday is coming from wildfires in Canada.

Blown by the current prevailing winds, that smoke is a point of concern, especially for the vulnerable.

While the smoke may have come a long way, somewhere in the neighborhood of 1,300 miles, the distance hasn't diminished the threat.

"You know the people with bad COPD or asthma, or people who have underlying lung disease for other reasons, those are the folks I really worry about," said Allegheny Health Network pulmonologist Dr. Tariq Cheema.

What about the general population?

"Children and older adults. That's the population."

Dr. Cheema says that what you see is what you breathe.

"Especially with these particles and smoke, you know, they can sometimes embed in your lungs, and the

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