Article - ‘Chemicals Flying Around With Wings’ by Bearnairdine Beaumont - Former Lufthansa Purser (injured by Contaminated Air in Aircraft), Researcher, Writer & Aerotoxic Campaigner:

https://www.aerotoxicteam.com/chemicals-flying-around-with-wings.html

Scientists are now revealing the full extent of the damage to human health caused by toxic chemicals in the air (pollution). The toxins from aircraft oil, hydraulic fluids, etc., have been harming people onboard aircraft for decades. 

News Report from The Guardian - May 2019:
https://www.theguardian.com/environment/ng-interactive/2019/may/17/air-pollution-may-be-damaging-every-organ-and-cell-in-the-body-finds-global-review?utm_medium=social&utm_source=twitter&utm_campaign=postfity&utm_content=postfitycd583