The northeastern U.S. is under a smoky haze caused by intense Canadian wildfires, which has prompted warnings from health officials to stay inside. A timelapse video shows just how quickly the sky in New York City went from gray to yellow to almost orange as the smoke rolled in on Wednesday. Officials in New York City issued warnings about hazardous air quality and some residents compared the smell of the air to a campfire. Several national sports organizations postponed games due to air quality concerns, while a Broadway matinee was halted Wednesday when an actor experienced difficulty breathing. Watch the video above to see how quickly the smoke obscures the New York City skyline.