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>> significant, but not large. the biggest amount we found, 44 billionth of a graham. toxic residue has collected from a prior fume event over from gradual accumulation of toxics. >> there is material floating around in the ventilation system and comes out on a regular basis. that's what you are measuring. >> reporter: so even if the flight you are on has not had a fume event, there are toxic fumes in the ventilation system and it's coming out? >> that's the case. >> reporter: he explains when engines are shut down, some oil can leak overnight. when a plane starts up in the morning, a mist of ...

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. >> ...

Bi billionth of a gram. that means toxic residue has collected on the surface of the cabin either from a prior fuel event or a combination of toxins. >> this is remnant material floating around literally in the ventilation system. this comes out on a regular base, 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. >> van netten explains his research shows when engines are shut down, some oil can leak overnight. when a plane starts up in the morning, a mi...

Aircraft. >> reporter: tim mah has analyzed surface swabs from 40 different flights and says he almost always finds tcp. and on virtually all of them you find it? >> pretty much so, yes. they are at significant levels. >> reporter: significant but not large. the biggest we found, 44 billionth of a gram. our air samples do not show any traces of tcp. that means toxic residue has collected on the surface of the cabin from either a prior fume event or from gradual continual accumulation of toxins. >> there is a fair amount of remnant material floating around literally in the ventilation system. t...

Surface swabs from 40 different flights and always finds it. the biggest amount we found, 44 billionth of a graham, not to have any kind of health consequences. air samples do not show traces of tcp, and that means toxic residue collected either from a prior event or from an accumulation. >> the material is floating around literally in the ventilation system and this comes out on a regular basis, and that's what you are measuring. >> reporter: so even if the flight you are on has not had a fume event, there are toxic fumes in the ventilation system and it's coming out? he explains, when engine...