Screenshot of the PurpleAir air quality monitoring platform taken August 20th, 2023 at 6:14 PM PDT, showing a 10-minute average US EPA PM2.5 AQI of 234 at the Des Moines, WA sensor, classified as a health alert (201-300 range). The graph panel shows AQI rising sharply over the preceding days, with surrounding sensors in the Sea-Tac/Kent/South King County area also showing very high readings (204–327).

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PurpleAir air quality monitoring map showing PM2.5 AQI readings in the Des Moines, Washington area. The map displays various sensor readings with a highlighted sensor showing an AQI of 234, indicating very unhealthy air quality conditions with health alerts for the area.

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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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