Unfortunately I was flying and missed the report.
I have personally had no fumes incident, none of the crew I have flown with have reported any ill effects of fumes, whilst flying on the same aircraft as myself.
Fumes are not restricted to 146's apparantly some Dash 8's recently have a fume problem of their own.
I understand that the 737 have a history as do Airbus ???????
CO in piston engine aircraft is probably more of an issue!!
Having said that, their are people who honestly believe the fumes are a concern and that alone should mean that it needs some investigation (as is ongoing) and preferably not by the media.