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Banned ozone-destroying chemicals are still being pumped into the atmosphere, worrying new research has revealed.
Scientists believe there are new sources of CFC production that are still putting billions at risk of exposure of cancer-causing UV rays.
Rate - Decline - CFCs - Cent - Researchers
The rate of decline of CFCs has slowed by 50 per cent since 2012, researchers say, which could be due to unreported new forms of production.
The Montreal Protocol was designed to protect the ozone layer by reducing the concentration of ozone-depleting substances, such as chlorofluorocarbons (CFCs), in the atmosphere.
CFCs - Family - Chemicals - Onward
CFCs are a family of high-stable synthetic chemicals that were used during the 1930s onward.
The substances - which were banned at the end of 1995 - were common in aerosol sprays, solvents and refrigerants.
Stratosphere - Process - Chlorine - Atoms - Turn
They only destroy naturally in the stratosphere in a process that releases chlorine atoms which in turn destroy ozone molecules.
Stephen Montzka and his colleagues from the National Oceanic and Atmospheric Administration in Boulder, Colorado looked at the decline in CFCs.
CFC-11 - Compounds - Research
CFC-11 is one of the most potent ozone-depleting compounds and it is decreasing much more slowly than would be expected, their research revealed.
The decline of atmospheric CFC-11 concentrations - as observed at remote measurement sites - was constant from 2002 to 2012.
Levels - Toxic - Compound - Cent - Simulations
Levels of this toxic compound then slowed by about 50 per cent after 2012 and based on simulations researchers believe there has been an increase in...
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