That's at the direction of the CDC who now says because of the soaring number of cases in the state -- entries and exits must be quarantined for at least 14 days.
“Everybody who was in New York should be self-quarantining for the next 14 days to ensure the virus doesn’t spread to others, no matter where they have gone, whether it’s Florida, North Carolina, or out to far reaches of Long Island,” Dr. Deborah Birx, the White House coronavirus coordinator, said at a press conference Tuesday. “We’re starting to see new cases across Long Island that suggest people have left the city. This will be very critical.”
As of this moment, NY has more than 25k cases and counting.