Natural gas is a safe, clean and efficient fuel for both home and business use. It is used in many areas of the Newark campus for building temperature control, hot water and dining operations. Natural gas is colorless and odorless. That distinctive smell associated with gas is a chemical called mercaptan that is added to help the end users detect a leak. If you ever smell gas, take action by immediately leaving the area and calling 911 or the gas suppliers emergency phone number.