A side-by-side comparison of Antarctic ozone concentration data measured by the satellite-borne Total Ozone Mapping Spectrometer in 1979 and 1996. The depletion of ozone is clear from the transparency of the atmospheric layer.

Data source: Total Ozone Mapping Spectrometer (TOMS) data from NASA Goddard Spaceflight Center (NASA/GSFC).

Credit : Planetary Visions Ltd.