Road traffic is responsible for adverse impacts on air quality and therefore, pollution reduction caused by emissions by motorized transport should be the goal of each city.

Cleaner vehicles can be achieved by using cleaner fuels e.g. biodiesel, biogas, Compressed Natural Gas (CNG) or Liquefied Petroleum Gas (LPG) and equipping vehicles with the latest generation filters or engines (e.g. introduce Enhanced Environmentally Friendly Vehicles (EEV) with emission standards equivalent to the EURO emission standards level V to VI). These measures are less effective than introducing new and clean vehicles/fuels.

To establish the widespread of cleaner vehicles, project partners such as decision makers, operators and research institutions should be involved in fuelling the use of cleaner vehicles to individual car users and private fleet managers.

Measures to support the uptake of cleaner vehicles could be by; establishing green environmental zones where only vehicles of a defined emission standard are allowed to enter, offering fiscal incentives such as lower parking prices for users of cleaner vehicles and providing non-fiscal incentives, Improving public transport supply (e.g. new lines, higher frequencies) to achieve a positive overall result, organizing marketing/promotion events when new cleaner fuel vehicles and technologies are introduced, political willingness to implement clean vehicle measures, funding for CV research studies, supporting local usinesses for the production and distribution of cleaner fuels, implementing joint procurement for clean vehicles which will in turn decrease their prices and introducing eco-driving courses for cleaner vehicles users. These measures will also reduce greenhouse gas emissions.