On road vehicles are one of the biggest contributors to air pollution, due to their immense CO2 emissions. The CO2 emission has been listed as the number one GHG that has been causing global warming and climatic changes. The main focus is reducing vehicular fuel consumption that contributes to the major GHG emissions. This measure is to curb unfavorable environmental impact. Browse complete report @ . A dirt bike or an ATV All Terrain Vehicle is meant to ride off road.