Relationships Between CO ₂ Emitted from New Passenger Cars in European Union and Their Engine and Vehicle Characteristics

The exhaust CO₂ emissions on the New European Driving Cycle and its urban and extra-urban part of the new passenger cars of European Union are correlated with four engine and vehicle characteristics: vehicle weight, engine displacement, engine max. power and engine max. specific power. Weight has the best correlations in the case of Diesel passenger cars and displacement in the case of gasoline ones. In the case of models with two variables, the model weight+specific power is the best in the case of Diesel passenger cars, while the model displacement+specific power is the best in the case of gasoline ones.