The European Car Free Day is being held as part of European Mobility Week, a series of events to launch new policies and initiatives and to raise awareness on damage to the environment.
Environment commissioner Margot Wallstrom said: 'By extending the European Car Free Day to a whole European mobility week we are moving up a gear this year and increasing opportunities to widen the debate on sustainable mobility.
'Climate disasters around the world this summer, including those in Italy, Germany, France and Eastern Europe, have reminded us just how pressing decisive matters are.'
Organisers of the car free day say it is designed to:
They say since the year 2000 the numbers of cities taking in the car free day initiative has doubled. Many of those cities will give the public the chance to test low emission vehicles.