Thousands of runners are expected to head to O'Hare Oct. 5 for the O'Hare 5K on the Runway race.
U.S. Rep. Mike Quigley said the original study was a failure, and called for FAA officials to re-do it.
The announcement came a day after a report showing complaints about jet noise soared from March to July.
Jet noise complaints soared 150 percent during the summer months, according to data released Friday.
The four-legged maintenance crew is back at the airport for its second season of grazing/weed-whacking.
The deadline for homeowners in Jefferson Township to appeal their property taxes is Sept. 4.
Ald. Pat O'Connor (40th) said residents of his ward have been "struggling" to cope with jet noise.
The extra monitors will help city officials gather data about the new runway's effect on area residents.
A civic coalition said Rahm Emanuel needs to do more to stop the jet noise over the Northwest Side.
The measure was sponsored by Alds. Mary O'Connor, Margaret Laurino, John Arena and Patrick O'Connor.
"No one ever said, 'You are going to have hundreds of more flights over head,' the congressman said.
Rosemarie Andolino should have done more to address noise complaints, a coalition of civic groups said.
From March 2013 to March 2014, the number of complaints filed about jet noise rose 645 percent.
The changes are designed to reduce the chance of mid-air collisions.
More should be done to reduce the impact jet noise is having on the Far Northwest Side, residents said.
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