Canadian wildfire smoke is drifting south again. Here’s how to prepare. Vox.comRapidly-spreading fires are threatening to burn through Canadian towns and degrading air quality CNNHow Inhaling Wildfire Smoke Can Affect You in the Long Term TIMECanada wildfires hit northern U.S. air quality, force thousands to evacuate AxiosA town in western Canada prepares for a possible ‘last stand’ as wildfires rage in British Columbia The Associated Press