The ozone hole over the South Pole does not appear to be improving, with the ozone loss in 1990 equaling the previous low detected in 1987, NASA researchers reported Friday.

Satellite measurements indicate the seasonal depletion of ozone over the Antarctic from August into December 1990 "matched the record 1987 ozone depletion in depth, duration and area," said scientists from NASA's Goddard Space Flight Center in Greenbelt, Md.