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Ozone layer is not recovering over most highly populated areas, scientists warned on Tuesday. The ozone layer which protects people from harmful ultraviolet radiation is not recovering over populated areas due to unexpected decreases in part of the atmosphere.

Ozone-layer

Since 1970, due to certain man-made chemicals, global ozone has been decreasing. The biggest losses in ozone were found over Antarctica and therefore these long-lasting substances were banned by Montreal protocol. Since these were banned, ozone layer’s several parts have been recovering, especially at the poles.

In addition, a new research has revealed that ozone layer which wraps the whole Earth is thinning in the lower stratosphere over the non-polar areas.

However, the new research published in the European Geosciences Union journal Atmospheric Chemistry and Physics today finds that Ozone layer is not recovering overpopulated regions.

The reason behind the falling ozone is not known, but scientists are considering a chemical which is used in paint stripper as well as atmospheric circulation changes caused by climate change.

“To identify what action might be needed to prevent further decreases, it is extremely important to understand what is causing the observed downward trend,” said Anna Jones, an atmospheric chemist at the British Antarctic Survey who was not involved in the new study.

William Ball, an atmospheric scientist at ETH Zurich university in Switzerland and led the new study said that our current best atmospheric circulation models do not forecast this negative surprising effect. Several substances could be the missing factor in these current models. Another cause of the falling ozone might be the result of global warming.