Doe's anyone know what the harmful to humans compounds are in jet engine exhaust.
If the jet engine is running cleanly, mostly it'll just be really hot air with lots of extra carbon dioxide. And yes, too much CO2 can kill you.
Certainly any exhaust contains harmful elements - you should never be close enough to injest these fumes, very dangerous for numerous reasons.
exaust of combustion will ALWAYS contain CO2 H2O and sometimes CO