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The Montreal Protocol is revised approximately every 2 years, so the best up-to-date source of information is the web-site of the United Nations Environmental Program Ozone Secretariat: http://www.unep.ch/ozone/index-en.shtml.

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The information in this section has been abstracted from the Climate Monitoring and Diagnosis Laboratory (CMDL) web-site (http://www.cmdl.noaa.gov). CMDL, which is part of the American National Oceanic and Atmospheric Administration (NOAA), provides both a daily up-date and historical records of stratospheric ozone levels over much of the globe. CMDL also maintains the sites around the world which monitor the atmospheric levels of CFCs, HCFCs and HFCs, reported in this section.

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Based on data published by the Alternative Fluorocarbon Environmental Acceptability Study (AFEAS) web-site: http://www.afeas.org.