Despite the protocol, emissions of CFC-11 have been rising since 2013, according to a study published on Wednesday in the journal Nature.
"The analysis of these extremely precise and accurate atmospheric measurements is an excellent example of the vigilance needed to ensure continued compliance with provisions of the Montreal Protocol and protection of the Earth's ozone layer", Fahey said. The CFC-11 was banned under the 1987 Montreal Protocol.
CFCs were once widely used in the manufacture of aerosol sprays, as blowing agents for foams and packing materials, as solvents, and as refrigerants.
The USA ceased production in 1996 and other countries agreed to phase out CFC production by 2010. "However, scientists and coverage makes will need to perceive the reason for these surprising CFC-11 emissions".
According to a new study, the emissions of the chemical can cause hole in the ozone layer.
"We're raising the flag to say, look, this is not what we hope happens for the ozone layer", said Dr. Montzka, a research chemist at the Earth System Research Laboratory in Boulder, Colo., a part of the National Oceanic and Atmospheric Administration.
The reduction in the atmospheric concentration of CFC-11 has made the second-largest contribution to the decline in the total atmospheric concentration of ozone-depleting chlorine since the 1990s.
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The situation got even worse in the years after 2012 when the rate of CFC decline slowed by 50 percent, which could have only been possible due to an increase in CFC emissions. "It is therefore imperative that this finding be discussed at the next Ministerial meeting of Governments given recovery of the ozone layer is dependent on all countries complying with the Montreal Protocol (and its adjustments and amendments) with emissions globally dropping to zero". The researchers have said they would need more measurements to figure the exact location of the source and take necessary action.
The researchers found that emissions of CFC-11 were between 2014 and 2016 up by a quarter from the average between 2002 and 2012.
"This is a worrying result", said Joanna Haigh, Professor of Atmospheric Physics at the Grantham Institute, Imperial College London, who was not involved in the report.
Montzka mentioned if the supply of the brand new emissions may be recognized and contained quickly, the harm to the ozone needs to be minor, however warned if not remedied quickly, substantial delays could possibly be induced to the already sluggish restoration of our protecting environment.
That has led scientists to predict that by mid- to late-century, the abundance of ozone-depleting gases would to fall to levels last seen before the Antarctic ozone hole began to appear in the early 1980s.
A study earlier this year found that the ozone layer is unexpectedly declining in the lower stratosphere - 10 to 24 kilometres above sea level - over the planet's populated tropical and mid-latitude regions.