RPA3439 had just departed KEWR enroute to KDTW on December 4 and was climbing through FL180 when the flight crew declared an emergency due to smoke in the aircraft and asked to return to KEWR. They turned around and landed safely a short time later on runway 22L. They taxied off the runway and asked to be checked out by the emergency equipment. While that was happening, a flight attendant told the flight crew that the smell in the cabin was getting worse so they decided to evacuate the aircraft on the taxiway. This caused all operations on the airport to stop while the passengers exited the aircraft and were taken to the terminal by buses. The airport resumed operations a short time later.
https://www.flightaware.com/live/flight/RPA3439/history/20241204/2139Z/KEWR/KDTW