text: After days of near record pollution, Paris enforced a partial driving ban to clear the air of the global city. Almost 4,000 drivers were fined, according to Reuters, an international news agency headquartered in London; 27 people had their cars impounded for their reaction to the fine. Cold nights and warm days caused the warmer layer of air to trap car emissions. The smog cleared enough Monday for the ruling French party to rescind the ban for odd-numbered plates on Tuesday.