“In confidential reports submitted to NASA, flight crews describe being overwhelmed by noxious fumes — struggling to stay conscious, land planes safely, or simply breathe — part of a larger body of evidence suggesting that contaminated cabin air is a recurring threat. While some recover from fume exposure in a few days, others have reported that they were left with severe and lasting health problems that ended their careers. Precisely how often these incidents happen is unclear.”

 

https://www.charlotteobserver.com/news/local/article312591085.html