The reveal of chlorofluorocarbons' (CFCs) potential to destroy the ozone layer in the Earth’s stratosphere was a life-changing discovery. In 1974, atmospheric chemist and 1995 chemistry laureate Mario Molina and his co-laureate Sherwood Rowland demonstrated that CFC gases, freons, have a damaging effect on ozone in the atmosphere. Freons had many uses, including propellants in spray cans and refrigerants in refrigerators. By limiting the use of freons, the depletion of the ozone layer was slowed

Earth’s ozone layer protects us from harmful solar radiation. Human activity, including use of ozone depleting compounds like some refrigerants, led to the Antarctic ozone hole. The 1987 Montreal Protocol phased down these compounds, leading to an improved ozone layer. NASA scientists work with other researchers around the world to monitor the health of the ozone layer and the size of the Antarctic ozone hole. https://go.nasa.gov/3eojsC8 #OzoneDay | NASA’s Goddard Space Flight Center

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