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An anal­y­sis shows that emis­sions of ozone-de­plet­ing chem­i­cal CFC-11 is ris­ing again

ozone-de­plet­ing chem­i­cal,t rich loro flu oro meth­ane or CFC-11, are on the rise again, shows an anal­y­sis by the US Na­tional Oceanic and At­mo­spheric Ad­min­is­tra­tion. Though CFC-11 was once widely used as foam­ing agents, its pro­duc­tion was phased out by the Mon­treal Pro­to­col in 2010. The study shows the rate of de­cline of at­mo­spheric CFC-11 was con­stant from 2002 to 2012, and then slowed by about 50 per cent af­ter 2012. The un­ex­pected in­crease is likely due to "new, un­re­ported pro­duc­tion from an uniden­ti­fied source in East Asia", it says. This will put at risk the ozone hole over the South Pole, which has shown signs of re­cov­ery.

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