ENVIRONMENTAL RESEARCH AND TECHNOLOGY INC CONCORD MASS
On February 4, 1976, the Secretary of Transportation ordered the FAA to monitor Concorde emissions at Dulles International Airport during its initial 16 month trial period. To comply with this order, it was necessary to measure the ambient pollution levels background in and around Dulles Airport and to trace the dispersion of emissions from a single Concorde aircraft. While the more conventional background measurements could be easily performed, there was no known case where the vertical and horizontal profile of the emission plume from a single aircraft had been identified. Special instruments were required to measure the discrete, non-steady nature of the dispersion of the aircraft plume. The final measurement system, which consisted of continuously recording electro-chemical sensors coupled with high-speed chart recorders, successfully detected CO emissions from a single aircraft.