The atmosphere around our earth contains small amounts of ozone; molecules made from three oxygen atoms. (nobelprize.org)
«When we ran these calculations, we found that in some cases, there was a significant amount of ozone that built up in the atmosphere, despite there not being any oxygen flowing into the atmosphere,» said Shawn Domagal - Goldman of NASA's Goddard Space Flight Center in Greenbelt, Maryland. (sciencedaily.com)
In the worst years, two - thirds of the Arctic ozone column (the total amount of ozone between the ground and the top of the atmosphere) is destroyed in the most severely depleted regions. (giss.nasa.gov)