Methanethiol is added to natural fuel earlier than it reaches homes and gives gasoline it is well-known "rotten egg" scent to assist house owners detect a gasoline leak [2]. http://Search.osakos.com/cache.php?key=c0792b69d674164f3134f6a4d8b0fd4b&uri=http%3A%2F%2FOlderworkers.COM.Au%2F