=== Natural Gases ===
Natural gas is used as a fuel in both liquid (LNG) and compressed-gas forms (CNG
). (Explain engine differences). Santa Monica, California's Big Blue Bus includes a fleet of buses powered by LNG. Los Angeles County Metropolitan Transportation Authority (LACMTA, or Metro) operates the country's largest fleet of CNG buses.
==== Bus Manufacturers with Natural Gas Offerings ====
The Gillig Corporation introduced a CNG option for their buses in 2011. New Flyer and subsidiary NABI provide CNG vehicles.
=== Propane ===