text: Paris enforced a partial driving ban to clear the air of the global city, after days of near-record pollution. Odd and even numbered plates were threatened to keep there cars home or forced to lay of fine of $31. Just about 4,000 drivers were fined. Sixety percent of congestion was down. China is known as one of the most polluted cities in the world. Taax policy favors Diesels over gasoline. Sixty-seven percent of diesels make up vehiclals, compared to 53.3 percent average of diesel engines in Wetern Europe. There is typically more smog in Paris. There were one hundred and forty seven micrograms of particulate matter per cubic meter, and this is compared to one hundred and fourteen and 79.7 reuters found. According the the BBC, public transit was free of charge from friday to monday. The smog had cleared enought monday for the ruling french party to rescind the ban for odd-numbered plates on Tuesday.