Airport Noise Management System (ANMS)
CURRENT REPORT
Summary
- Operations:
Most used departure runway is 28R with 23% utilization.
Most used arrival runway is 28C with 22% utilization.
Total operations +9% compared to August 2025 and +1% compared to July 2026.
West Flow 59%, East Flow 41%
Nighttime operations accounted for 15% of overall operations.
- Fleet Mix:
Regional Aircraft -1.1% compared to July 2026.
Narrow-Body Aircraft +1.2% compared to July 2026.
Wide-Body Aircraft -0.2% compared to July 2026.
- Noise:
41 noise monitors reported noise data for August.
Site 26 and Site 40 have unrecoverable data due to power malfunction.
5 monitors showed a decrease of 1 dB or more compared to August 2025.
17 monitors showed an increase of 1 dB or more compared to August 2025.
- Complaints:
Complaints +64% compared to August 2025 and +12% compared to July 2026.
Number of verifiable households -3% compared to August 2025 and -2% compared to July 2026.
The Chicago Department of Aviation provides monthly reports to O’Hare Noise Compatibility Commission members based on the Airport Noise Management System (ANMS). The ANMS is a comprehensive system designed to provide actual measurement of the aircraft noise levels in Chicago neighborhoods and suburban communities near O’Hare Airport.
The ANMS integrated system includes many components, including a network of 32 permanent noise monitors that measure the noise environment. The system directly connects to the FAA’s air traffic control radar that collects aircraft flight tracks. More than 5 million data points are recorded and stored by the system each day.
At the direction of the ONCC, the ANMS and report compilation methodology were independently verified by an aircraft noise expert.
Installed in 1996, the Airport Noise Management System (ANMS) records noise events that are summarized by month in four categories: Runway Use, Aircraft Noise, Aircraft Fleet Mix, and Noise Complaints.
Data from Permanent Noise Monitors and/or Long-term Portable Monitors does not determine eligibility for residential or school sound insulation.
The Chicago Department of Aviation and ONCC use ANMS data to facilitate development and management of noise mitigation programs at O’Hare.