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That includes Pincher Creek, Waterton and the Crowsnest Pass.
“The anticipated smoke trajectory indicates that the areas impacted will grow to the north and east as the weekend progresses and this alert will likely be expanded,” said the federal agency’s website.
But it also said the smoke should begin to clear out of Alberta by Monday night.
The smoke, which contains toxins including carbon monoxide and tiny particulates, can impact respiratory and cardiovascular health.
Scientists say the impacts of climate change have parched forested areas, heightening the intensity and size of wildfires.
The blazes in the U.S. have raced through wide areas of California, Oregon and Washington State, destroying thousands of buildings and killing dozens of people.
on Twitter: @BillKaufmannjrn