According to NASA scientists, the ozone hole over Antarctica, compared to 1988 (when it reached its maximum), continues to decline. Part of this is due to both natural climatic processes and international cooperation in the field of nature protection.
In 1997, 197 countries signed an international agreement – the Montreal Protocol, which limits the emissions of chemicals that have a destructive effect on the ozone layer of the Earth. As a result, by September of this year the size of the ozone hole over Antarctica has decreased to 7.6 million square meters. miles. Compared with last year, it decreased by 1.3 million square meters. miles. This is the lowest figure for the last 30 years.
According to scientists, the main factor contributing to the reduction of ozone loss was unusually warm weather. However, even despite such encouraging indicators, the ozone hole is still quite large, largely due to the high content of chlorine and bromine in the atmosphere that destroy the ozone layer.
For the first time an ozone hole over Antarctica became known in 1985 as a result of monitoring the atmosphere, which was conducted by British scientists. Annually it is formed in August and is delayed by the beginning of winter. The ozone content in these places does not exceed 30% of the norm.
According to the forecasts of the United Nations and the World Meteorological Organization (WMO), the restoration of the ozone layer over Antarctica can last until 2050.