Can ozone have negative environmental effects?

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试卷: LEED GA模拟题B[查看]
Can ozone have negative environmental effects?
A: No, ozone is essential to life on earth
B: Yes, when located in the upper atmosphere
C: No, ozone is located in the upper atmosphere
D: Yes, depending on where ozone is located

参考答案: D

本题解释:
(O3) is a gas composed of three oxygen atoms. It is not usually emitted directly into the air, but at ground-level is created by a chemical reaction between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of sunlight. Ozone has the same chemical structure whether it occurs miles above the earth or at ground-level and can be \'good\' or \'bad,\' depending on its location in the atmosphere.

In the earth\'s lower atmosphere, ground-level ozone is considered \'bad.\' Motor vehicle exhaust and industrial emissions, gasoline vapors, and chemical solvents as well as natural sources emit NOx and VOC that help form ozone. Ground-level ozone is the primary constituent of smog. Sunlight and hot weather cause ground-level ozone to form in harmful concentrations in the air. As a result, it is known as a summertime air pollutant. Many urban areas tend to have high levels of \'bad\' ozone, but even rural areas are also subject to increased ozone levels because wind carries ozone and pollutants that form it hundreds of miles away from their original sources.

\'Good\' ozone occurs naturally in the stratosphere approximately 10 to 30 miles above the earth\'s surface and forms a layer that protects life on earth from the sun\'s harmful rays.