According to NASA scientists, the ozone hole over Antarctica, compared to 1988 (when it reached its maximum), continues to shrink. This is partly due to both natural climatic processes and international cooperation in the field of nature conservation.
In 1997, 197 countries signed an international agreement - the Montreal Protocol, limiting the release of chemicals that have a destructive effect on the Earth's ozone layer. As a result, by September of this year, the size of the ozone hole over Antarctica decreased to 7, 6 million square meters. miles. Compared to last year, it decreased by 1, 3 million square meters. miles. This is the lowest figure in the last 30 years.
According to scientists, unusually warm weather has become the main factor contributing to the decrease in ozone loss. However, despite such encouraging indicators, the ozone hole is still large enough, which is largely due to the high content of chlorine and bromine in the atmosphere, which destroy the ozone layer.
For the first time, the ozone hole over Antarctica became known in 1985 as a result of atmospheric monitoring carried out by British scientists. It forms annually in August and drags on to the beginning of winter. The ozone content in these places does not exceed 30% of the norm.
According to forecasts by the UN and the World Meteorological Organization (WMO), the restoration of the ozone layer over Antarctica may last until 2050.