Wildfire smoke map: Which US cities, states are being affected by Canadian fires
A wildfire smoke map shows the U.S. cities and states that are being the most impacted by the toxic plumes from the fires burning in Canada. As Canada continues to battle its worst wildfire season on record, toxic smoke has Travel ed south and is once again blanketing states across the U.S. Air quality alerts stretched from Montana to New York and as far south as North Carolina and Tennessee as of Monday morning, according to AirNow, an air quality website run by a partnership between the federal government and state and local air quality agencies. Cities including Billings, Montana, Cleveland and Pittsburgh had Air Quality Index ratings of above 150, which is considered "unhealthy." Meanwhile, residents in Chicago woke up to the fifth worst air quality among major cities worldwide, according to an ABC News analysis. MORE: What East Coasters could learn from West Coast wildfires as smoke from Canada hits Northeast "Haze from wildfire smoke will persist in our region i...