Jan 21 1975
From The Space Library
The current fleet of supersonic transports-including the 16 Anglo-French Concordes and 14 Soviet Tu-144s flying or scheduled for service-would cause minimal damage to the ozone layer, Dr. Alan J. Grobecker, Director of the Dept. of Transportation's Climatic Impact Assessement Program, announced at a press briefing. Citing a 3-yr DOT study, "The Effects of Stratospheric Pollution by Aircraft," Dr. Grobecker said it would require 125 Concordes flying 4.5 hr daily to cause a minimally detectable change in the ozone layer. However, the study concluded that future expansion of stratospheric jet fleets should be carefully monitored.
Recommendations made by the study included development of engines to meet specific nitrogen oxide-emission standards, development of low-sulfur aviation fuels, and establishment of stratospheric air-quality standards and engine-emission regulations. (AP, NYT, 22 Jan 75, 33; Robinson, Av Wk, 27 Jan 75, 16-17)
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