Letter from EPA Region X Office of Air Quality regarding CO concentration analysis at Sea-Tac Airport

A letter from Anita Frankel, Director of the EPA Region X Office of Air Quality, addresses concerns about air quality evaluations near Seattle-Tacoma International Airport. The letter confirms that EPA raised concerns about the adequacy of using the CAL3QHC model to evaluate CO concentrations at intersections, noting that a more conservative analysis should have included additional intersections when switching to oxygenated gasoline. It also acknowledges the Port of Seattle's collaborative work with local, state, and federal agencies to develop an interagency air quality monitoring project around the airport.

Notes

A letter from Anita Frankel, Director of the EPA Region X Office of Air Quality, addressing questions about the adequacy of evaluating four intersections using the CAL3QHC model to determine CO concentrations. The letter discusses concerns about oxygenated gasoline, cumulative impacts in the Sea-Tac area, and acknowledges the Port of Seattle’s work with local, state, and federal regulatory agencies to develop an interagency monitoring project for air quality conditions around the airport.

V V