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The Montreal Protocol has been hailed for controlling chlorine-based chemicals that created a vast hole in the ozone layer over Antarctica. But new research suggest a chemical not controlled by the international treaty poses a potential risk to the Earth's protective ozone layer. The chemical is dichloromethane - a chlorine-based industrial solvent and paint stripper whose concentrations have been rising rapidly in the atmosphere over the past decade. [Source: NOAA Office of Oceanic & Atmospheric Research]
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