Kate is researching air pollution and finds some information on ozone. she knows that ozone is a good thing as part of the ozone layer, so why is it also an air pollutant?

a) at ground level, ozone contributes to smog.

b) we breathe out ozone, adding it to the atmosphere.

c) ozone breaks into carbon dioxide.

d) it contributes to global warming.

"At ground level, ozone contributes to smog" so it is also an air pollutant.

Option: A

Explanation:

ozone is naturally present in stratosphere and acts as shield against harmful ultraviolet radiations. But it acts a pollutant contributing to global warming when it is present in lower level atmosphere particularly troposphere. In this level it combines with primary pollutants that is "nitrogen oxides" and "volatile organic" compounds to form secondary pollutant which absorbs outgoing radiation and contributes in raising the temperature. It has harmful impacts on vegetation as well as human health.

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