 since 1970 what comes out of your tailpipe i wouldn't uh i wouldn't advise people closer garage there's still some things that are harmful in there but but we've done a tremendous job in reducing pollution um and our air is cleaner now i can remember days when when i was a child we were driving past gary the gary steel mills in northwest indiana and a film covered our windshield as we were driving on the on the expressway we had to pull off and wipe the film out it was in the air