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Name: K Hopkins
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In the region of 30-32N latitude and 92-96W longitude, does the column ozone appear to be thinning in late June and early July? If so, should this be cause for alarm? Please explain.

Northern hemisphere ozone is a bit thinner than usual this year (1993), presumably because of sulfur droplets ejected into the upper atmosphere by Mt. Pinatubo eruption. As usual, I am wearing abroad brimmed hat and using a sunscreen with a skin protection factor (SPF) of 15 or more to prevent skin cancer. That is a good idea regardless of how thin the ozone may be, but thinner ozone screens less ultraviolet light, thus making it easier to damage skin cells with sunburn and tanning.

Don Libby

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