Substances may deplete an (ozone layer).Logical formLearned from155 sentences. Exposure can be to ozone.Logical formLearned from153 sentences. Ozone can be in a stratosphere.Logical formLearned from143 sentences. Damage can be to an (ozone layer).Logical formLearned from126 sentences. Ozone may undergo a production.Logical formLearned from119 sentences. An (ozone hole) can be over a continent.Logical formLearned from118 sentences. Ozone may undergo concentration.Logical formLearned from117 sentences. An (ozone layer) may pertain-to the atmosphere.Logical formLearned from93 sentences. Ozone can be in the atmosphere.Logical formLearned from91 sentences. Ozone may undergo a loss.Logical formLearned from91 sentences. A size may pertain-to an (ozone hole).Logical formLearned from90 sentences. A recovery may pertain-to an (ozone layer).Logical formLearned from89 sentences. Ozone can be gas.Logical formLearned from89 sentences. Ozone may be formed.Logical formLearned from87 sentences. Ozone can be a pollutant.Logical formLearned from84 sentences.