In the last decades the importance of the reduction of CO2 and pollutant emissions has raised, mainly in the transportation sector; for this reason, in Europe were introduced some rules to set the limits of emissions and the way to measure them. This work is focused on Light Commercial Vehicles (LCV), the factors that influence their CO2 emissions and on the European Regulation for the calculation of the CO2 target for the years 2025-29 with the comparison with the previous regulation (2021-24). As a first point all the factors that influence the target and emissions are analyzed starting from the mass, type and dimensions of the vehicle, tires and optional equipment effects.