Estimation of CO₂ Emission from Vehicles

Abstract

For CO₂ as global warming substance, CO₂ emissions from diesel and LPG vehicle were culculated from the emission factors and the statistical fuel marketing amount of these vehicles. And adding the emission from gasoline vehicle, total CO₂ emission from vehicles in Japan was calculated.
Theoretical CO₂ emission factors of diesel and LPG vehicles are respectively 2.61 (kg/l) and 3.09 (kg/kg), but the factors calculated from actual running mode were respectively 2.34 (kg/l) and 3.01 (kg/kg), affected by particulates and so on in exhaust gas. The CO₂ emissions calculated by these factors and the statistical fuel marketing amount were 50, 996×10³ ton and 4, 527×10³ ton respectively, and the total CO₂ emission added the emission of gasoline vehicle was 144, 077×10³ ton. The total CO₂ emission showed the samll increase almost every year, especially the emission from diesel vehicle showed the largest increase.