The National Weather Service is cautioning people in states as far south as Virginia to monitor local air quality as smoke from hundreds of Canadian wildfires pours over the border and threatens the h...

As hundreds of wildfires burn across Canada and smoke continues to fill the air, some neighboring regions may experience impacts as winds shift the haze southward.

Exposure can worsen asthma, heart disease and other respiratory conditions, particularly among children, older adults and people with underlying health issues.