- DO NOT TURN ON OR OFF ANY ELECTRIC LIGHTS OR APPLIANCES.
- DO NOT OPEN OR CLOSE THE WINDOWS.
- DO NOT TRY TO SHUT OFF THE GAS.
Natural gas is almost pure methane which does not have any odor. For safety purposes, odorants are added to natural gas. Federal regulations require that gas be odorized so that it can be smelled at a concentration of one percent gas in air, one-fifth of the lower flammable limit ("LFL") of natural gas. Massachusetts regulations are more stringent. The DPU requires gas distribution companies to odorize the gas so that it can be smelled at a concentration of .15 percent gas in air. If you smell gas inside a building, you should evacuate the building as rapidly as possible. Call the gas company or the fire department from outside the building.
This information is provided by the Department of Public Utilities