The CAA, FAA & too many regulators are in the grip of the industies commercial priorities and will not change unless something comes down from above - maybe this should be on Obama's hit list?
Out of interest, what is the NTSB's proclamations, if any, on the need to radically improve cabin air quality...
as we seem to have an impasse between the equivalent bodies on this issue in the UK (until I suppose, an accident can be directly attributed to it - which may never happen)