Cars would only be charged with buses and lorries in a Class D CAZ. The contribution of lorries and buses to NO2 emissions varies between monitoring sites in Bristol. Overall, diesel cars cause 40% of the air pollution from transport in Bristol, while diesel buses and coaches cause 23% and diesel vans causing 22%. The Government’s Clean Air Zone Framework advises us to consider emissions from buses and HGVs ahead of car emissions, but they are not the sole, or even major source of the problem. The overall aim of Bristol’s Clean Air Plan is to bring about compliance with EU limit values in the shortest possible time. We are therefore considering a range of measures focused on a variety of transport modes.
Current evidence shows that the performance of EURO VI buses and HGV’s is much closer to their type approval ratings than cars.