virginia don t need to make the change. they stay on their time zone year round. many of us have been worrying about the iran dangers. it s extremely rare for a plane to crash, but it s far more common to have problems with the air inside the cabin. adam chernoff has been investigating so-called fume event. he s here with part two of his investigation. allan? reporter: we ve been talking about how toxic fumes can seep through the engine. how do we know the air on board is actually safe? we collected samples from a trans continental flight. i m not going to say the airline because it s a problem that faces all of them. even though i was aware of the results, they were surprising. could the air on board your next flight be toxic? ventilation air comes through the engine, so an oil leak can