text: In paris there had a offical ban from drving your cars, people who were caught driving cars were fined up to 22-euro($31).Cold nights and warm days caused the warmer layer of air to trap car emisssions. Caris typically has more smog than other european capitals with paris having up to 147 micro grams of particulate matter (pm) per cubic meter compared with 114 in brussels and 79.7 in london, reuters found. Congestion was down 60% after just five-days of intensifying smog which even rivaled places such beijing and china.