Discussion
Volatile organic compounds are important in air quality principally because they
Answer: D
Correct answer: Act as precursors to photochemical ozone
Volatile organic compounds matter chiefly as precursors. In sunlight they react with oxides of nitrogen through a chain of radical reactions that converts nitric oxide to nitrogen dioxide without consuming ozone, allowing ozone to accumulate - the basis of photochemical smog.
Some individual compounds are also directly toxic or carcinogenic, benzene among them, but the reason the class as a whole is regulated is ozone formation. They are not the bulk of coarse particulate, and it is the chlorofluorocarbons, a separate group, that deplete stratospheric ozone.
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