Tens of millions of Americans are under air quality alerts due to smoke from fires in Canada. For the second day in a row, New York City recorded the worst air quality in the world among major cities. NBC News’ Emilie Ikeda has the details on what health experts are saying. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more …

Former Vice President Mike Pence and former New Jersey Governor Chris Christie, both former Donald Trump allies, will announce their campaigns for the presidency. WATCH the live stream of ABC News here: https://www.youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch more at http://abcnews.go. com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc #ABCNewsLive #2024PresidentialRace #Republicans #ChrisChristie #MikePence …

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