Passenger cars and heavy duty vehicles and buses are the principal contributors to NOX emissions from this sector; for CO in 2013, passenger cars alone contributed around 55% of emissions from the 'Road transport' sector.
Passengercars and heavy duty vehicles and buses are the principalcontributors to NOX emissions from this sector; for CO in2013, passenger cars alone contributed around 55% ofemissions from the 'Road transport' sector.