PSCAA UFP Chinatown July 28, 2026 chart

Notes

This chart displays SMPS (Scanning Mobility Particle Sizer) particle bin counts and geometric mean particle size at the 10th & Weller monitoring station, generated on 2026-07-28 at 17:13:06 PST with last data timestamp of 2026-07-29 00:03:31 UTC. It shows particle bin midpoint (nm) versus local PST time, with contour lines colored by log(10) of counts ranging from approximately 2.6 to 5.0, and brown diamond markers indicating geometric mean particle size hovering around 15–26 nm throughout the measurement period.

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StART SEA Stakeholder Advisory Round Table
Add to CalendarMWednesday Aug 26, 5:00pm - 7:00pm
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Meeting Objectives Introduce the primary feedback themes identified by StART members regarding StART’s Operating Procedures and determine areas that may warrant future discussion. 5:00 PM – Welcome Meeting Management Welcome Lead: Andrés Mantilla, Facilitator, Uncommon Bridges; Wendy Reiter, Airport Managing Director, POS 5:15 PM – Dinner: All participants eat. 5:30 PM – StART Operating Procedures
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Commercial Aviation Work Group
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Meeting Agenda 10:00 a.m. – 10:15 a.m. | Welcome – Evan Nordby, Chair a. Introductions and Agenda Reviewb. Status of appointments and non-voting member invitationsc. Other updates as necessary 10:15 a.m. – 11:00 a.m. | Is it practical and legal to operate the western Washington [Puget Sound] airports as a single airport system? – Consultant
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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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