text: Robert Duffer it states in paragraph  seventeen "due to cars in Paris typically has more smog than any other European captials" .If cars was ban smog wouldnt be a problem to our world. Since smog are caused by smog congestion was down sixty percent in the capital of France. The smog rivaled Beijing,China which is known as one of the most polluted cities in the world. In Frace they have more cold nights then warm due to smog because the warmer layer of air is trapped by car emissions.