text: Paris enforced a partial driving ban to clear the air for global city. On every Mondays motorists with even and odds numbered license plates were order to leave thier cars at home or suffer $31 of fine. Diesl fuel was blamed, since France has a tax policy that favors diesel over gasoline. The congestion was doen 60 percent in the capital of France, after five days of investgion. Cold nights and even warm days the weather caused the layer of air to trap car emission. Comanies complained lost revenue while exceptions for plug in cars, such as Hybrids. The same thing happens on the Tuesday for the odds number, depending on the lisnces plate. In Bogota Colombia people hike, bike, and even skate to the places they needed to be at Carlos Arturo said ''It's a good opportunity to take away stress and lower air pollution''. The days without cars is a part of an improvement campaign.