Proposed flight paths for Badgerys Creek Airport go straight over the Mountains although the draft Environmental Impact Statement (EIS) has concluded the airport's operations will not harm the World Heritage Area.
While the flight paths for arrivals are slated to cross vast swathes of the Mountains, the report said they will be so high they will be barely noticeable.
"Almost all flights would be at an altitude greater than 5,000 feet and most would be more than 10,000 feet above sea level when passing over the World Heritage Area.
"At these altitudes, aircraft are likely to be difficult to discern from ground level and are not considered to be visually intrusive."
But it did say that planes would fly at less than 5,000 feet over "Warragamba and the eastern boundary of the Blue Mountains National Park, which would experience 50 to 100 flights per day".
This was unacceptable, according to the mayor, Mark Greenhill.
"There will be the potential for five inbound pathways that all converge on Blaxland with decibel readings of around 70. This will equate to standing near about 198 lawn mowers each day.
"Springwood looks like it will be subject to two of these pathways.
"This is an awful outcome for the Lower Mountains and it must be opposed," he said.
Labor spokeswoman for Macquarie, Susan Templeman, said she was "horrified" at the flight paths.
"The EIS shows that every single flight landing at the airport will fly over the Lower Mountains and directly over Blaxland at a little over 5000 feet.
"So that's 100 times a day - day and night - that Blaxland and Glenbrook residents will be disturbed by aircraft noise and is totally unacceptable."
She also said there should be flight sharing across the west, as is done at Sydney Airport.
"I urge people to take a close look at the EIS and join me in fighting for a fair go for the Blue Mountains, which is being betrayed by these plans," she said.
But two supporters were Macquarie MP Louise Markus and Ward 4 councillor Brendan Christie.
Clr Christie said the EIS "proves wrong the claim that Badgerys Creek airport will jeopardise the World Heritage status of the Blue Mountains. As I have always said, our community needs to be a part of the conversation and not be blindly opposed to Sydney's second airport."
He also said he would advocate for flight paths over uninhabited land, not over Blaxland.
Mrs Markus said the airport would help the tourism industry in the Mountains, providing more jobs in the region and creating a "global hub for business travellers and tourists".
Referring to the Mountains most-visited tourist destination, Echo Point at Katoomba, the EIS said it would not experience increased noise levels.
It continued: "The majority of other sensitive areas are likely to be impacted only during the infrequent operation (predicted to be once every two days) of the Boeing 747 (or equivalent)".
The mayor said he had no doubts that the plan will adversely affect the Lower Blue Mountains.
"It will completely change the feel of the place and I fail to see how it can do anything other than affect part of the World Heritage Area and I'm referring to the National Park at Glenbrook."
Blue Mountains MP, Trish Doyle, welcomed the release of the EIS and called for a commitment to building rail links to service any airport.
"Mr Turnbull also needs to come clean on the curfew question once and for all," she said.
"While on principle I don't think there should be one rule for the city and one rule for the west, we should at least be given the courtesy and respect of a straight answer."
Keith Muir, director of the Colong Foundation for Wilderness, said the EIS confirmed that planes will be funnelled through Springwood and the southern parts of the World Heritage Area.
“Although the aircraft are relatively high, the natural quiet of the World Heritage Area has not been adequately protected.
“If the wilderness becomes polluted with aircraft noise, then there is nowhere left to go.”
The public will have the next 60 days to comment on the draft EIS. Submissions can be made via www.westernsydneyairport.gov.au and close on December 18.