Discussion
Statement I: Ground level ozone is controlled by regulating ozone emissions.
Statement II: Ozone is formed in the atmosphere from oxides of nitrogen and volatile organic compounds in sunlight.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Ground level ozone cannot be controlled by regulating ozone emissions, because ozone is not emitted - it is a secondary pollutant.
Statement II is correct and is why: ozone is formed in the atmosphere from oxides of nitrogen and volatile organic compounds reacting in sunlight. Control must therefore address those precursors, which is far harder than controlling a primary pollutant, since the chemistry is non-linear - reducing nitrogen oxides can raise local ozone in some urban conditions even while lowering it downwind.
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