text: To continue, think that you`re living in a big city like new york or chicago or philidelphia. Now think of every single car in that city. Alot right? well every single one of those cars do the same thing they just are used to get to point A to point B. well think of all the gas that car is pooring into the streets by just sitting at a red light. now can you see about another couple hundred thousand doing that at the same time? its pretty bad right? all that gas and chemicals hits the streets first then you can smell it from your 4th story apartment and then its stuck in there for hours. think about how bad that is for your lungs and all your senses. Im no doctor but id say that its pretty horrible and maybe even cancerous. just think about that before you dont limit usage on your car!