text: Additionally, Paris has enforced a partial driving ban to clear the air of the global city. These cities have stopped using their cars for a while to help calm the air pollution. "On Monday motorists with even numbered license plates were ordered to leave their cars at home or suffer a 22-euro fine ($31)" (Robert Duffer, paragraph 11). Although that people were not supposed to us ehtier cars that day, 4,000 drivers were fined according to Reuters. The cause for not driving for that day was because the cold nights and warm days caused the air to trap car emissions. Another reason for car free in Paris is because of the micrograms found. "Last week Paris had 147 micrograms of matter (PM) per cubic meter compared with 114 in Brussels and 79.9 in London, Rueters found"(Duffer, 17). Its an advantage to prevent car usage because the smog is clearing in these cities.