Surprised no one has mentioned EasyJet's move regarding toxic cabin air.
EasyJet to filter toxic air in cabins
Snip from the article:-
EasyJet is to fit filters to stop toxic fumes entering its passenger cabins and cockpits in a move seen as the industry’s first acknowledgment of “aerotoxic syndrome”.
The condition, long denied by airlines, is feared to be responsible for several deaths of pilots and crew and hundreds of incidents where pilots have fallen ill, sometimes at the controls. Frequent flyers and young children could also be affected, it is claimed.
EasyJet told The Sunday Times that “health concerns” had led it to work with a commercial supplier, Pall Aerospace, to “develop and design a new cabin air filtration system” for testing on the company’s aircraft next year.