The whole of Paris includes the Crit’Air environmental zone. The city area of Paris is defined without suburbs and includes the area inside the city’s ring road – the “Boulevard périphérique”. This is not an official motorway and is described as ‘E15’ in the Eastern part of Paris, ‘Bois de Boulogne’ in the Western part of Paris and ‘Bois de Vincennes’ in the South east part of the city. Click below to see a map. Here’s where the Crit’Air restrictions apply in Paris If you’re driving within the Paris ringroad, then you will need a Crit Air sticker. This will need to be at least a Crit Air 4 to drive in the zone on weekdays from 8am-8pm.