Nattemby
There is a bunch of information on toxic air and stuff but not so much on cosmic and electromagnetic radiation.
Um, well at the risk of being controversial I'd say you'd got that the wrong way around. Over the decades there's been a significant amount of research into the radiation environment at airline cruising levels, including epidemiological studies into it's effects. I rather suspect it's far more thoroughly scientifically researched than "toxic air". Problem you might be encountering is that very little of the research has been translated from the scientific papers into "plain English".
Google is your friend, here's one fairly readable paper for starters...
http://http://oem.bmj.com/content/59/7/428.full