Bushfires during 2019-20 caused a chemical reaction that increased ozone depletion, according to a new study published in the journal Nature.
, researchers in the United States and China identified a previously unknown chemical reaction in the wildfire smoke that increased the depletion of ozone, the atmospheric gas that reduces the amount of ultraviolet radiation reaching the Earth's surface.
"These chemical reactions are happening right on the edge of the region where the ozone hole happens," she said, explaining that the "particles give it a little extra push". The ozone hole was first created by human pollution, particularly chlorofluorocarbons emitted from many refrigerators, but in recent decades, a global agreement on these man-made chemicals has given the ozone layer a chance to heal.
United Nations modelling predicts that the ozone layer over the southern hemisphere should fully heal by 2060.
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