Howard - it's in their benefit for no evidence to be put forward, as there is no evidence to suggest that aviation fumes are any different than car fumes.
I agree completely that it's dangerous that only one side is getting attention, as the powers that be may think that it's what everyone wants. Any suggestions on top of forming a "Keep Essendon Airport Open" ?
I believe there was something similar done at BK by flying schools, started by DW of Basair. Anyone know if that's having any success? (slightly different aim I know)