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Pinatubo begins its ozone assault.

Balloon flights over Boulder, Colo., early last month measured the lowest December ozone values ever recorded at this site. The unusual readins came on the same day that a patch of Mt. Pinatubo's volcanic cloud passed overhead, and may in part reflect ozone destruction catalyzed by sulfuric acid particles in the cloud, says David J. Hofmann of the National Oceanic and Atmospheric Administration in Boulder.

Soon after the eruption, scientists predicted that the particles could dramatically accelerate ozone destruction around the world. To determine the extent of ozone loss over the northern midlatitudes, experts must wait a month or more until the full cloud reaches this region. Hofmann predicts that when the cloud travels to the far south, it may generate an "extra" ozone hole during the Antarctic fall. The "usual" ozone hole appears during Antarctica's spring.
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Title Annotation:Mount Pinatubo, Philippines
Author:Monastersky, Richard
Publication:Science News
Date:Jan 4, 1992
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