Freezing clouds threaten record Arctic ozone loss It is feared that a combination of record low
temperatures and atmospheric clouds in the Arctic will interact to
create the northern hemisphere's largest-ever ozone hole. Solar
radiation causes a reaction between stratospheric ozone and
chemicals containing bromine or chlorine which are on the surface
of ice particles in clouds. The low temperatures will cause more of
these ice crystals, and so there will be more ozone-destroying
reactions. 22 JANUARY 2000, P. 18
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