Cities from New York and Washington, D.C., to Knoxville, Tennessee, and Albuquerque, New Mexico, are studying a new way to address noise pollution by installing what looks like an army of radio reporters on the streets. They’re commonly referred to as noise cameras. When a loud car passes by — typically one exceeding 85 decibels — these noise cameras snap a photo of the car’s license plate and a ticket is mailed to the driver. Marketplace’s Meghan McCarty Carino spoke to Erica Walker, a noise researcher and epidemiologist at Brown University, about her skepticism of this new surveillance system.