If you want to know more about the Toxic Air In Aircraft & Aerotoxic Syndrome and why the airlines, regulators and government are doing nothing to prevent it, these videos may help:

Zembla Investigate Aerotoxic Syndrome (2017):
Part 1 - The non-disclosure clause
https://www.youtube.com/watch?v=P94i7_eM13A

Part 2 - The interests
https://www.youtube.com/watch?v=BcKwFE5nfYQ