Flights delayed in NYC due to poor visibility from wildfire smoke

<p>A health emergency is in effect as skies over New York are shrouded with heavy, toxic smoke. Millions of Americans are at risk as wildfires in Canada create an air-quality crisis in the United States. Plus, Mike Pence is taking on Trump as he officially launches his 2024 bid for the White House. Pence is preparing to answer questions from Iowa voters at a live CNN town hall event later tonight. <br><br></p><p>To learn more about how CNN protects listener privacy, visit cnn.com/privacy</p>