Icy reaction

BROMINE from sea salt destroys low-level ozone in the Arctic, says a German scientist. Chain reactions triggered by bromine oxide are known to destroy ozone. This causes ozone holes in the lowest kilometre or two of air in the Arctic spring that last up to three days. Now Thomas Wagner of the University of Heidelberg has used satellite data to find high levels of bromine oxide close to sea ice (Nature, vol 395, p 486), suggesting that melting sea ice may release the bromine. Halogen compounds may also affect ozone at lower latitudes, where it is a pollutant,
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