The worst Canadian wildfire season in recorded history spread an orange haze from Massachusetts to South Carolina and as far west as Missouri, threatening to disrupt flights and forcing millions to mask up or stay inside. Bloomberg's Brian Sullivan and Michael McKee report. Follow Bloomberg for business news & analysis, up-to-the-minute market data, features, profiles and more: http://www.bloomberg.com Connect with us on... Twitter: https://twitter.com/business Facebook: https://www.facebook.com/bloombergbusiness/ Instagram: https://www.instagram.com/quicktake/?hl=en