Comments on Draft General Conformity Determination for the Sea-Tac Airport Runway and Associated Development Projects

A 1996 public comment letter raises serious concerns about air quality violations related to the proposed third runway expansion at Seattle-Tacoma International Airport, arguing that the environmental review failed to adequately account for nitrogen dioxide and carbon monoxide pollution affecting nearby neighborhoods. The author contends that the General Conformity Determination is flawed because it ignores existing NAAQS violations, underestimates future NOx emissions from larger aircraft and increased flight operations, and treats the airport as a regional rather than a concentrated point source of pollution. The letter calls for more rigorous modeling and mitigation measures before any finding of conformity is approved.

Notes

A letter to the FAA Northwest Mountain Region commenting on the Draft General Conformity Determination for the Sea-Tac Airport third runway expansion project. The author raises concerns about NO2 and CO air quality violations, inadequacies in the air pollutant modeling methodology, and the treatment of aircraft emissions in the State Implementation Plan. The letter argues that predicted and existing NAAQS violations are not adequately mitigated and that future fleet mix and operational increases will worsen air quality impacts.

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