return to: A Space-based Perspective		Left: Daily total ozone levels in the Antarctic Spring of 1998. Ozone levels have been dropping since spaceborne measurements began in the late 1970s because of the widespread use of chlorofluorocarbons. (Image and animation courtesy NASA GSFC Scientific Visualization Studio)

	Subscribe to the Earth Observatory About the Earth Observatory Contact Us Privacy Policy and Important Notices Responsible NASA Official: Lorraine A. Remer Webmaster: Goran Halusa We're a part of the Science Mission Directorate