Natural gas is one of the cleanest burning alternative fuels available.

    * In light-duty applications, air emissions from natural gas vehicles are lower than emissions from gasoline-powered vehicles. Carbon monoxide and nitrogen oxides, smog-producing gases, are reduced by more than 90 percent and 60 percent, respectively. Carbon dioxide, a greenhouse gas, is reduced by 30 to 40 percent.
    * In medium- and heavy-duty applications, natural gas engines have shown a more than 90 percent reduction of carbon monoxide and particulate matter and a more than 50 percent reduction of nitrogen oxides, relative to commercial diesel engines.