text: First, an example of a "car free day"  is in Paris, France. This city has typically more smog than other European capitals. "Last week Paris had 147 micrograms of particulate matter per cubic meter compared with 114 in Brussels and 79.7 in London, Reuters found". After days of near-record pollution, Paris enforced a partial driving ban to clear air pollution of the global city". Monday motorists with even number license plates were ordered to leave their car at home or suffer a 22-euro fine ($31)". The same would apply to odd number plates the following day". The congestion went down sixty percent in the Capital of France, the smog cleared enough monday for the ruling French party to rescind the ban for odd numbered plates on Tuesday.