Last Updated: July 26th, 2026

Minutes of Quiet by Noise Monitor

I need a break

We all know that the gap between flights is shrinking. But how bad is it? We know that the noise is bad for human health–not merely ‘annoying’. Nighttime flights are especially bad, causing sleep disruption.

This report show you the amount of time between flights as detected by the Port of Seattle’s NOMS. That gap is an area that needs to be studied more thoroughly.

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Minutes of QuietSEA18 — 1205 S 226th St - 01/01/2024 to 12/31/2024 - DNL Hours Only (2026-07-26 20:55)

DNL Night Period (10pm–7am) Prevalence
Nights with at least one event: 100.0% (366 of 366 nights)
Median events per night: 98.0
Nights by event count: 0: 0 | 1: 0 | 2: 0 | 3+: 366

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Minutes of QuietSEA13 — Cedarhurst Elementary - 01/01/2024 to 12/31/2024 - DNL Hours Only (2026-07-26 20:55)

DNL Night Period (10pm–7am) Prevalence
Nights with at least one event: 100.0% (366 of 366 nights)
Median events per night: 65.0
Nights by event count: 0: 0 | 1: 0 | 2: 0 | 3+: 366

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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