Gas facts
Natural gas is a fossil fuel called methane - a flammable gas formed deep in the earth. It is naturally odorless and colorless. A chemical called mercaptan is added to natural gas by utility companies - this chemical gives natural gas an odor similar to rotten eggs. The presence of this odor means there is a gas leak.
Like all fuels, natural gas requires the proper amount of oxygen to burn. When burning efficiently, a natural gas flame is blue in color. Any other color, such as orange, is a sign to contact a qualified heating and repair person. Incomplete combustion can produce carbon monoxide gas.
When used properly, natural gas is a safe, reliable, and efficient source for your home energy needs.