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Antarctic ozone layer in 2006. The blue and purple colors are where there is the least ozone, while the greens and yellows are where there is more ozone.

Four New Mystery Gases Are Harming the Ozone Layer

More than 20 years after legislation phased out ozone-depleting gases such as halons and methyl chloroform, scientists have discovered four mysterious new culprits that are still impacting the ozone layer. A study published online yesterday in Nature Geoscience estimates that more than 74,000 tons of the compounds, including three chlorofluorocarbons and one hydrochlorofluorocarbon, have accumulated in the atmosphere between the 1960s and 2012. Time reports the source of the emissions is still unclear, but that they may be produced from chemicals used to clean electronic components and make insecticides.

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