A mystery source of banned, ozone-destroying chemicals has been pinpointed to eastern China
Hong Kong .
Scientists noted a spike in the amount of chlorofluorocarbons, or CFCs, in the atmosphere last year, despite a global ban on their use. The source of the emissions remained unknown, however, sparking concerns that it could hamper years of international effort to repair the protective ozone layer. CFCs used to be common in refrigerators, aerosol cans and dry cleaning chemicals.
Antarctic ozone layer is healing 01:20Read MoreAn international study published in the journal Nature this week pinpointed the source to eastern China. Previously, it had been suggested the source was in Asia, but scientists were unable to identify which country the emissions came from. "Initially our monitoring stations were set up in remote locations, far from potential sources.
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