text: In the U.S we dont' get smog for car. we tend even  to hear about smog at all. But paris that another story. They banned the uses of personal automobiles just so they could reduce the amount of particulate matter (PM) per cubic meter. Compare to brussel which is 114 (PM) and london which is 79.7 (PM).The best city to compare paris smog to is beijing because just like them the smog is very visble. Once your able to see smog by just looking outside that not a good sign. It then becomes unheathy just to breath the air around you. Would want to live in a city where all you see is smog?