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Sea-Tac Airport Communities Impact Study: Air Quality Analysis (Section 6, Appendix A)

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This 2020 study examines how Seattle-Tacoma International Airport affects regional air quality, reviewing data from 1997 to 2018 collected across 13 monitoring stations within a 15-mile radius of the airport. It finds that King County consistently meets federal, state, and regional air quality standards for pollutants such as ozone, carbon monoxide, nitrogen dioxide, and particulate matter. In fact, pollution levels have generally decreased over time, leading authorities to shut down some monitoring stations near SeaTac due to consistently low readings.

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Stantec-prepared Section 6 (Air Quality) of the 2019/2020 Department of Commerce Sea-Tac Airport Communities Impact Study, covering air quality changes from 1997 through 2018 within a 15-mile radius of Seattle-Tacoma International Airport. Analyzes NAAQS criteria pollutants — ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), PM2.5, PM10, TSP, and lead (Pb) — against 1997 and current federal, Washington State, and Puget Sound Clean Air Agency (PSCAA) standards. Documents 13 monitoring stations in King County operated by Ecology and PSCAA, including Beacon Hill, 10th & Weller, East Marginal Way (Seattle-Duwamish), Lake Sammamish, Kent-James & Central, and Auburn-M Street. Finds King County in Attainment or Unclassified status; notes discontinuation of SeaTac NO2/PM10 monitors due to decreasing trends well below NAAQS.

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