Smoke-Filled Skies Leave Midwest Fearing Another Season of Polluted Air The New York TimesCanadian wildfires trigger air quality alerts across 4 U.S. states Yahoo! VoicesDozens of blazes burning in Canada are sending smoke to the US. Several major fires have forced hundreds of evacuations CNNCanada Wildfire Smoke Again Reaching US – Videos from The Weather Channel The Weather ChannelSmoke from Canadian wildfires reaches US, Minnesota under air quality alert ABC News