A second Sydney airport at Badgerys Creek would have a severe noise impact on as few as 300 homes, it has been reported.
Fairfax Media on Saturday reported that an analysis of the 2011 census shows little residential development under likely flight paths for a development at the western Sydney suburb.
The federal government is due to release a report into a rival proposal for an airport at Wilton soon but on Friday a forum of business groups, councillors, property developers and community and welfare groups voiced their support for a Badgerys Creek airport.
Fairfax reported that Bob Meyer, a former senior planning officer and director at architects Cox Richardson, presented census analysis to the forum showing that 328 dwellings near a Badgerys Creek airport would sit within an "Australian Noise Exposure Forecast".
It is generally recommended people do not live in this contour, the report noted.
During the late 1980s and 1990s the then-federal government spent $170 million acquiring the land at Badgerys Creek but a decision to proceed is yet to be made.
In March 2012, a joint federal and NSW government study recommended proceeding with a new airport at Badgerys Creek and lifting the limit of 80 aircraft movements per hour.
The Gillard government rejected both recommendations.