text: The private cars that are increasing with numbers and chemicals are are owned by the middle class people that leave nothing but pollution in their cities. The people in the middle class are more exsposed to smog and they need to use less of the private cars in order to reduce pollution in the cities  also need to reduce the amount of cars on their street and increase the amount of passengers in their cars. Another reason for limiting the car usage is " united stat and elsewhere to separate suburban life from auto use." they are stating that they dont need cars to go where the need to go because they can use other things. They also are saying that they're not contributing toward the pollution.