A new study finds there are more than 3,300 natural gas leaks across Boston, but officials say they do not pose a safety risk.
The Boston University study says the leaks are the result of an old gas infrastructure system.
Six of the leaks were releasing gas above the level at which explosions could occur, but the utility National Grid told The Boston Globe it's repaired those leaks.
The study says replacing old gas lines would increase public health and safety, cut greenhouse gas emissions, and save money.
This program aired on November 20, 2012. The audio for this program is not available.