My parking garage hates my car

OK YOU have to remember...cars today HAVE sealed systems, the vented gas is pulled forward to be burned with the supply line gas, HENCE no smell...BACK in the day the tank vented to the environment, as the car or tank got hotter the gas swelled and pushed the vapors out of the vent /overflow line. THIS is perfectly NORMAL for older vehicles and NOT necessarily dangerous, unless of course someone lights a torch and places it directly next to your vent line