Smoke from over 700 wildfires in Canada have made air quality in cities from Minnesota to the Northeast among the worst in the world. Meanwhile, dozens of fires are burning in the West. --- Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7 coverage of