Half of all cars banned in Paris
17 March 2014 Last updated at 16:21 GMT
Half of all cars in Paris will be banned from the road today in a bid to reduce air pollution.
Only cars with an odd-numbered registration plate will be allowed on the road today.
Tomorrow only cars with an even-numbered registration plate will be allowed.
The government in France is trying to reduce the pollution levels in the city.
Anybody ignoring the rules will be fined - but some electric vehicles will be allowed on the road.