This article is from the Ozone Depletion: The Antarctic Ozone Hole FAQ, by Robert Parson firstname.lastname@example.org with numerous contributions by others.
Ground-based measurements began in 1956, at Halley Bay. A few years
later these were supplemented by measurements at the South Pole and
elsewhere on the continent. Satellite measurements began in the
early 70's, but the first really comprehensive satellite data came
in 1978, with the TOMS (total ozone mapping spectrometer) and SBUV
(solar backscatter UV) instruments on Nimbus-7. The Nimbus-7 TOMS,
which finally broke down on 7 May 1993, is the source for most of
the pretty pictures that one sees in review articles as well as the
popular press. (See http://jwocky.gsfc.nasa.gov/). Today
there are several satellites monitoring ozone and other atmospheric
gases; instruments on NASA's UARS (Upper Atmosphere Research Satellite)
simultaneously measure ozone, chlorine monoxide (ClO), and
stratospheric pressure and temperature.