Wow, thanks for the detailed technical info.
Yes, i am sure that flight wasnt that exceptional. Lots of people in a small space, dehydrated, tired and stressed and with bugs flying around. I only noticed it this time because I felt bad.
I think it would be interesting to see info about how air quality varies across planes and airlines. Also do those up front get more air than those in the back? I súppose they do just because of the lower density of people. Can we have an MFO/AFO scheme?