TOP: These data show the observed long-term change in the globally averaged ozone concentration since 1979, after accounting for the year-to-year effects of solar influences. The downward trend is much greater than that which can be attributed to periodic variation in the Sun's energy output. The decrease in ozone is attributed to increasing chlorine and bromine in the stratosphere, due primarily to emissions of CFCs and other ozone-depleting gases that result from human activities.

BOTTOM: These observations show the correlation between measured increases in UV radiation at the surface with decreases in stratospheric ozone concentrations. These data from Antarctica represent the most complete set illustrating this correlation. Exposure to increased UV radiation can cause skin cancer and eye damage in humans. Continued ozone losses are predicted for the remainder of the decade; however, if nations continue to comply with the Montreal Protocol and its amendments, the ozone layer will recover in the 21st century.

Credit for both figures : World Meteorological Organization/United Nations Environment Programme. Scientific Assessment of Ozone Depletion: 1994