"When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen. A freed oxygen atom then combines with another oxygen molecule to form a molecule of ozone."
Ozone layer on the mend, thanks to chemical ban http://www.sciencemag.org/news/2016/06/ozone-layer-mend-thanks-chemical-ban
"The Antarctic ozone hole has been a potent symbol of humankind's ability to cause unintended environmental harm. But now comes a glimmer of good news: The void in the ozone layer is shrinking. 'It's a big surprise,' says Susan Solomon, an atmospheric chemist at the Massachusetts Institute of Technology in Cambridge. 'I didn't think it would be this early.'"
Ozone Hole Watch http://ozonewatch.gsfc.nasa.gov/
"View the latest status of the ozone layer over the Antarctic, with a focus on the ozone hole. Satellite instruments monitor the ozone layer, and we use their data to create the images that depict the amount of ozone."
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