Good display of selective reading MOR. That particular survey was aimed at boeing aircraft, however the catalyst behind the campaign was
Balpa - The aircraft environment
with such gems as
"Most aircraft, such as the Boeing 747 and 767 and the Airbus A340,have virtually no reported flight deck contamination problems. Others, however, and most notably the BAe 146, are well known for the occasional leakage of contaminated air into the bleed air system."
and
"....while the BAe146 is clearly one of the main culprits, other aircraft such as the Boeing 757 also produce significant amounts of pollutant"