Toxic Bleed Air
Boeing recently settled a case with an FA for undisclosed amount.
Flight crews (and lawyers) are beginning to understand this is serious.
The FAA commissioned a research paper entitled:
MANAGEMENT OF EXPOSURE TO AIRCRAFT BLEED-AIR CONTAMINANTS AMONG AIRLINE WORKERS A GUIDE FOR HEALTH CARE PROVIDERS
A scientist in Seattle has blood samples from 92 people that have experienced symptoms. The suspected culprit chemical is a detergent in the turbine engine oil called tricresylphosphate. A more detailed discussion on the toxicity of
tricresylphosphate engine oil additives can be found in Attachment 1 to the FAA's whitepaper.