Antarctic Ozone Layer Stratospheric ozone occurs in the atmosphere between altitudes of 12 and 18 miles. Ozone in the stratosphere is frequently measured in Dobson units, where 300 Dobson units corresponds to an ozone layer 3 millimeters thick. In 1991 the reported minimum in the Antarctic ozone hole was about 110 Dobson units. (Source: R. Huffman, Atmospheric Ultraviolet Remote Sensing.)
(a) The thickness y of the ozone layer is directly proportional to the number of Dobson units x. Find the constant of proportionality k.
(b) How thick was the ozone layer in 1991?
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