How do airport noise curfews reduce nighttime aircraft noise?

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Airport noise curfews reduce nighttime aircraft noise by limiting the hours of operation for flights at urban airports. Because nighttime noise is considered significantly more disruptive to the public than daytime noise, these restrictions serve as a primary tool for managing the impact of aviation on surrounding communities.1

By prohibiting or restricting aircraft movements during specific night hours, airports can directly decrease the frequency of noise events that disturb residents. This practice is often part of a broader strategy to mitigate noise pollution, which also includes:1

Restricting or banning particularly noisy aircraft models.1
Designating flight paths over less-populated areas.1
Encouraging airlines to adjust approach and departure procedures to minimize engine thrust over residential zones.1
Monitoring operator performance and imposing financial penalties on those who violate noise regulations.1

Through these combined efforts, airports can lower the exposure of urban populations to aircraft noise while continuing to accommodate growth in passenger traffic.1