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Basis. and that's what you're measuring. >> so even if the flight you're on hasn't had a fume event, there are toxic fumes in that ventilation system, and it's coming out? >> that's exactly the case. >> reporter: explains, engines can leak overnight. a mist of oil can spread through the cabin. >> you don't want to be the very first person on the plane in the morning when they turn it on. >> that's what pilots are. they're the ones that turn on the engine. >> reporter: only one trillionth of a gram of tcp in her hair. >> her hair probably picked it up from the seat. that would say to us when yo...

>> that's exactly the case. >> reporter: he explains his research shows when engines are shut down, some oil can leak overnight. when a plane starts up in the morning, a mist of oil can spread through the cabin. so you don't want to be the very first person on the plane when they turn it on. >> that's what pilots are. pilots are the ones that turn on the engine. >> reporter: the hair showed traces of tcp as well but only one trillionth of a gram. her hair probably picked it up from the seat. that would say to us when you get off that plane, you should take a shower. >> well, you should take a ...

Morning when you turn it on. >> that's the pilots, they turn on the engine. >> reporter: laura's hair shows tpc traces as well, but only one trillionth of a gram. >> the two leading aircraft manufacturers use the same ventilation system acknowledge fume events can occur, but they say the system provides good and safe air quality. and they say the amount of tauxens are not going to cause health problems, but the greatest risks is for the people that work onboard the plane. crews should be equipped with air monitors so they can measure toxicity levels especially in the event of a fume event. >> ...