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.
One city official said changing flight paths would just move noise from one neighborhood to another one.
Mayor Rahm Emanuel and U.S. Sen. Dick Durbin unveiled the $26 million project Friday morning.
Anthony Hargrove was ordered held on $250,000 bail Wednesday in connection with the new charges.
Anthony Hargrove was charged after returning to an O'Hare terminal to steal additional bags, police said.
Thick fog enveloped the city Thursday causing hundreds of flights to be canceled.
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