As dozens of wildfires rage across the US and Canada, blackening the skies once again this summer, scientists are revealing even more about how dangerous wildfire smoke is for our health.
Some of the worst fires – including the Durkee fire in Oregon, the Park fire in California and the Jasper fire in Alberta, Canada – have sent smoke billowing for hundreds of miles around them, blanketing cities like Boise and Calgary with poor-quality air.
