text: Source 2: "Paris bans driving due to smog" , by Robert Duffer , talks about "healthier" air. So , another advantage would be to have smog-free air. Congestion was down 60% in the capital of France after five days of intensifying smog. Cold nights and warm days caused the warmer layer of air to trap car emissions , diesel fuel was to blame. Delivery companies complained of lost revenue and Public transit was free of charge from Friday - Monday , according to BBC. The smog cleared enough Monday for the ruling French party to rescind the ban for odd numbered plates on Tuesday. This way the air we breath doesn't harm us.