You may not realize this, but by itself, natural gas is completely odorless. As a safety precaution, however, Memphis Light, Gas and Water adds a chemical to the gas that gives it a distinctive odor similar to rotten eggs. This scent allows you to detect even the slightest amount of natural gas, both indoors and outdoors. Please take a moment and take MLGW's Natural Gas Safety Quiz. We have also provided a version of the quiz in Spanish.