42 communities and 19 school districts dedicated to reducing aircraft noise in the communities around O’Hare International Airport since 1996.


Currently, there are 36 noise monitors registering aircraft noise throughout the O’Hare International Airport region. The Chicago Department of Aviation plans to install and commission additional noise monitors in Chicago Wards 40, 41 and 39.

The CDA routinely checks the calibration and performs annual preventative maintenance for every noise monitor in the Airport Noise Management System (ANMS). Noise monitors are sited in consultation with community representatives and based primarily on the criteria outlined in the fact sheet titled Criteria for the Permanent Noise Monitors at O'Hare International Airport.

Once the noise events are collected and downloaded to the CDA's ANMS, they are correlated to actual aircraft operations. The process that correlates noise events to aircraft operations uses defined parameters to match every eligible noise event to specific aircraft operations. Noise events that fall outside these parameters are classified as community noise.

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