Canadian wildfire smoke hits more than a dozen US states

Canadian wildfire smoke puts around 70 million US residents under air quality alerts | CNN Canadian wildfire smoke continues to plague the United States, triggering air quality alerts for more than a dozen states from Montana to Vermont. Caitlin Kaiser CNN

Canadian wildfire smoke is bringing unhealthy air across the northern tier of the United States to start the week, triggering air quality alerts for more than a dozen states from Montana to Vermont.

Forecasters predicted around 70 million people would see decreased visibility and poor air quality, including residents of Chicago, Detroit, New York, St. Louis and Cleveland.

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