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Answer for the clue "A layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun ", 11 letters:
ozonosphere

Word definitions for ozonosphere in dictionaries

WordNet Word definitions in WordNet
n. a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun [syn: ozone layer ]

Wiktionary Word definitions in Wiktionary
n. A layer in part of the stratosphere that has a larger than normal concentration of ozone; the ozone layer

Usage examples of ozonosphere.

For each problem we have uncovered, such as the effect of halocarbons on the ozonosphere, might there not be another dozen lurking around the corner?