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Mystery Source discovered by already banned ozone-depleting substances



The darker colors in the map represent the areas with the highest carbon tetrachloride emissions. This shows a concentration of the already banned substance in eastern China. Lunt, Park, et al. )

The source of mystery for the continued emissions of an already banned ozone depleting substance is finally discovered. Instead of falling after the ban, emissions in certain regions have even increased.

Ozone Depleting Emissions

In 201

0, the production of carbon tetrachloride was banned worldwide because it destroyed the earth's ozone layer, which protects us from harmful ultraviolet radiation. However, recent studies show that despite the ban, about 40,000 tonnes of the substance are still emitted into the atmosphere.

The source of emissions was a mystery to scientists, according to researchers from Bristol University. together with researchers from the United States, South Korea, Switzerland, and Australia, they worked together to quantify emissions in East Asia, both from 2010 and 2016 ground and air concentration data.

Mystery Source Revealed

What researchers have found There are still significant emissions from eastern China, which make up a large sum of missing global estimates. In addition, carbon tetrachloride emissions from East Asia were even significantly higher than previously assumed. In addition, they also found no evidence of a decline in emissions in the region since 2010. The data even show a slight increase in emissions from the region since 2010, as well as a new source of emissions from Shandong province in China after 2012

Knowledge gaps

Co-author dr. Matt Rigby notes that her research there answers a big question. There are still gaps in knowledge that need to be addressed, such as the exact industries that are responsible for it. In addition, it is not yet known if the emissions were intentionally or unintentionally produced, perhaps as a by-product in the manufacture of other chemicals such as chlorine.

"Studies such as these show the importance of monitoring ozone-depleting gases, and there is a temptation to see ozone depletion as a solved problem, but the monitoring of man-made ozone-depleting gases in the atmosphere is essential to ensure the continued success of the phasing out of these compounds, "said lead author Dr. Mark Lunt from the University of Bristol.

The study is published in Geophysical Research Letters .

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