21. Which fuel is considered as a clean fuel for vehicles ?
Answers
Answer:
Clean-fuel vehicles are motor vehicles designed to be propelled by one of the following fuels: biodiesel, hydrogen, electricity (e.g. plug-in technology including hybrid and all battery), ethanol, liquefied natural gas (LNG), liquefied petroleum gas (e.g. LPG or propane), and natural gas (e.g. compressed natural gas or CNG).
Clean-fuel vehicles are motor vehicles designed to be propelled by one of the following fuels: biodiesel, hydrogen, electricity (e.g. plug-in technology including hybrid and all battery), ethanol, liquefied natural gas (LNG), liquefied petroleum gas (e.g. LPG or propane), and natural gas (e.g. compressed natural gas or CNG).
Clean fuel vehicles have a number of properties that make them more attractive than conventional vehicles. They have lower tailpipe emissions of air pollutants like carbon monoxide (CO), nitrogen oxide (NOx), sodium oxide (SOx) and fine particles, and provide higher fuel economy. In metropolitan Washington, vehicles contributes to one third of greenhouse gas emissions.