Wildfire Smoke Causes Disruptions Across US and Canada

Poor air quality caused by wildfires in Canada is affecting millions of people across the US and Canada, with hazardous haze disrupting daily life and raising concerns about health effects. The smoky blanket is expected to persist into Thursday and possibly the weekend, with weather systems barely moving. Officials are warning residents to stay inside and limit outdoor activities, and some places have extended "Code Red" air quality alerts for a third straight day. The smoke has even reached northern Europe, but is not expected to be a health concern. Canadian officials say this is shaping up to be the country's worst wildfire season ever.