The ozone layer only recovered after 40 years

The World Meteorological Organization (WMO) claims countries need at least four more decades to restore the ozone layer to levels before 1980 .

>>>Asia-Pacific uses a lot of ozone-depleting substances

Xinhua quoted Geir Braathen, a WMO expert, saying that in the past decade, the stratospheric ozone layer in the Arctic and Antarctic regions as well as globally has not decreased further, but it has not really recovered.

According to scientists, in the middle of this century the ozone layer outside the polar region will recover from the level before 1980, but in Antarctica the recovery process takes longer.

The amount of ozone depleting gas in the stratosphere in Antarctica reaches its maximum in 2000 and is currently decreasing by about 1% per year.

Experts say that the downward trend is due to the Montreal Protocol on ozone depleting substances, which was signed on September 16, 1987. This decree contributes to the reduction of ozone production and consumption, the gradual removal of ozone-depleting chemicals.

According to the "Antarctic Ozone" news that WMO released last weekend, ozone holes above Antarctica are smaller than last year, but larger than in 2010.

From 1979 to 1990 the amount of ozone in the stratosphere decreased by about 5%. Because the ozone layer prevents most of the harmful ultraviolet rays, allowing them to penetrate the earth's atmosphere, declining ozone status is becoming a concern of the global public opinion.