text: in some car intensive areas across the areas in the United States. Congestion also plays into the problem. In France, there was an increase of smog in their cities, and disel runned cars were to blame. As an outcome, the cold nights and warm days caused the warmer layer of air to cage in car emissions.  With the limitation of car usage comes the decrease of toxic air roaming into our atmosphere, and an increase of a healthier lively one.