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want to especially recognize the 12 community representatives who each volunteered dozens of hours to learning, sharing knowledge, and advocating for the needs and desires of their neighbors and communities. Together, all of StART’s members, presenters, and observers, including the Federal Aviation Administration (FAA), make this forum a powerful force for greater understanding and collaboration between SEA and the communities that surround the airport. was delighted to see everyone come back to the (virtual) table in 2021 after some challenges in earlier years. The new Steering Committee (composed of city representatives, Alaska Airlines, the FAA, and Port staff) played a key role in setting StART agendas and administering our new operating procedures. This new approach allowed procedural issues of concern to be arbitrated through collaborative dialogue, which expanded everyone’s sense of trust. Welcome & Summary Committed to Collaboration in 2022 am pleased to present this report on SEA Stakeholder Round Table’s (StART’s) 2021 activities on behalf of the city government officials, community representatives, Port staff, and airline representatives who make this collaboration successful. This report features a Summary of 2021 Activities (pgs. 4-7). Topics include a renewed culture of trust and collaboration, a new Steering Committee, pandemic and recovery, impact studies, and the Sustainable Airport Master Plan (SAMP) process, as well as summaries of the topics explored by the Federal Policy and Aviation Noise Working Groups. An overview of each StART and Working Group meeting agenda is also included (pgs. 8-9). StART 2021 Annual Report | 3 Table of Contents…

Source: International Civil Aviation Organization (ICAO) for the U.S. Total, FAA Terminal Area Forecast (TAF) for SEA. Commercial Service Forecast & Gap Analysis Scenarios Analyzed to Address 2050 Demand Scenario 1: Baseline (50-60% of demand) Scenario 2: Meet 80% of demand Scenario 3: Meet 100% of demand 55 million million million million 2050 Passenger Enplanement Forecast Scenario 1: Baseline (50-60% of Demand) No additional facilities Sea-Tac: Implements range of near- term and long-term projects Paine Field: Maintains current capacity Existing Commercial Facilities New Commercial Capacity Required Sea-Tac: Implements near-term and long-term projects airport with 2 runways Scenario 2: Meet 80% of Demand Bellingham Intl.John WayneSan Jose Intl. Sacramento Intl. Paine Field: Maintains current capacity single-runway airports Existing Commercial Facilities New Commercial Capacity Required Scenario 3: Meet 100% of Demand Sea-Tac International Sea-Tac: Implements near-term and long-term projects Paine Field: Maintains current capacity Existing Commercial Facilities New Commercial Capacity Required airport with 3 runways Multiple airports totaling 3 runways Impacts of Delay Av er ag e An nu al A irc ra ft D el ay (m in ut es p er pe ra tio n) Annual Aircraft Operations Operations in 2018 Projected “Baseline” activity in 2050 • Based on airfield capacity: airspace, runways, taxiways • Not impacted by increase in gates • Activity levels higher than 490,000 would likely involve FAA management of operations and/or “slot controls” like JFK, LGA and DCA Projected Sea-Tac Commercial Service Delay Demand Factors Increasing population and jobs • The region is expected to grow…

• Which air pollutants and communities do we focus on, and why? • Where do priority air pollutants come from? How is overall air quality and air pollutant trends? • How does air quality in south King County compare with other areas? What are trends? • Ultrafine particle pollution and & upcoming UW study • Questions? Agency Mission We work to protect public health, improve neighborhood air quality, and reduce our region’s contribution to climate change. Everyone has the right to breathe clean air. Small size; Cardiac and Respiratory Effects Fine Particle Pollution Why focus on fine particle pollution (PM2.5) Most established health effects include: • Asthma aggravation • Reduced lung function • Heart attacks • Strokes • Premature death Well established – based on large body of evidence National Ambient Air Quality Standard (acute and chronic); local health goal