Transcription of Q7: What emissions from human activities lead to ozone ...
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Q7: What emissions from human activities lead to ozone ...
TWENTY QUESTIONS: 2006 human -produced chlorine and brominegases. human activities cause the emission of halogensource gasesthat contain chlorine and bromine emissions into the atmosphere ultimately lead tostratospheric ozone depletion. The source gases that con-tain only carbon, chlorine, and fluorine are called chlo -rofluorocarbons, usually abbreviated as CFCs. CFCs,along with carbon tetrachloride (CCl4) and methyl chlo -roform (CH3 CCl3), historically have been the most impor-tant chlorine-containing gases that are emitted by humanactivities and destroy stratospheric ozone (see Figure Q7-1).
lifetimes (e.g., the HCFCs, methyl bromide, methyl chlo-ride, and the very short-lived gases) are substantially destroyed in the troposphere, and therefore only a frac - tion of each emitted gas contributes to ozone depletion in the stratosphere. The amount of a halogen source gas present in the atmosphere depends on the lifetime of the gas and the
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