PARK SLOPE - Park Slope residents are on noise patrol.

They say they are collecting evidence to prove that air traffic is too loud and are demanding answers from local politicians.

Residents on 5th Avenue between 8th Avenue and Prospect Park West live right underneath the route planes take to and from LaGuardia Airport.

Residents say they've been fighting the Federal Aviation Administration since 2007 and recently discovered that the noise levels are breaking federal law.

The Day Night Level (DNL) measures the sound levels allowed by law. A level of 65 means the FAA and Port Authority have to investigate. Neighbors say they did the calculations themselves, provided levels of 63 and 65 to officials and still did not get answers.