Comments on Sea-Tac Airport third runway SEIS: Air quality and nitrogen dioxide analysis

This document raises concerns about unreliable and inconsistent data used in environmental impact studies for Sea-Tac Airport's third runway, including flawed forecasts for aircraft operations and disputed nitrogen dioxide dispersion analyses. Critics argue that the studies underestimated peak-hour departure rates and used unrealistic fleet mix figures, leading to artificially low pollution impact projections. A separate health risk analysis linked airport expansion to significant increases in cancer and respiratory disease risk for nearby residents and airport workers.

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A critical review of the nitrogen dioxide dispersion analysis and air quality data in the 1997 Supplemental Environmental Impact Statement (SEIS) for Sea-Tac Airport’s third runway. The document argues that inconsistent figures, unrealistic fleet mix assumptions, and flawed peak hour modeling undermine the environmental review. It also summarizes health risk findings from a separate analysis showing significant cancer and respiratory disease risks to nearby residents and airport workers.

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