Word: layers
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...NASA has two programs that sponsor upper atmosphere research," Wesoky says. "We are funding studies to understand the effects of chlorofluoro carbons [CFCs] on the Antarctic ozone layer as well as studies to understand the impact of a fleet of supersonic aircraft on ozone depletion...
...fundamental tenet of atmospheric chemistry is that ozone depletion is controlled by nitrogen oxide radicals and the hydrogen oxide and halogen radicals play a much smaller part," Anderson says. "We have experimentally shown that in the lower ozone layer, the hydrogen oxide radicals are on top and the halogen radicals are dominant. The nitrogen oxide radicals play the smallest role at less than 20 percent...
...group's work was supported by the National Aeronautics and Space Administration [NASA] High Speed Research Program. Howard L. Wesoky, manager of atmospheric effects of aviation at NASA Headquarters, says that the research is a key part of a comprehensive study of the ozone layer...
Supersonic aircraft, which currently include the Concorde and some military planes, produce these nitrogen radicals in their engines. "Estimates show that a 50 percent increase in nitrogen radicals [in the lower ozone layer] is expected from a fleet of supersonic aircraft," Wennberg says...
...This HSCT would go twice as far [as the current Concorde can] with three times as many people at one-10th the ticket price and not damage the ozone layer," Goldin said. "And with its speed, it could do twice the work of a subsonic aircraft...