Credits www.epa.gov/ozone/ www.atm.ch.cam.ac.uk/tour/psc.html www.theozonehole.com/ www.wikipedia.org/ www.greennature.com earthobservatory.nasa.gov www.unep.org/ozone www.al.noaa.gov www.cmdl.noaa.gov see www.outsideworld.org/Physics/ for the full sources