Which of the following is generally not consi | vedclass

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(D) Carbon dioxide $(CO_2)$ is a natural component of the atmosphere and is essential for photosynthesis in plants. While it is a greenhouse gas contr

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$CO_2$

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(D) Carbon dioxide $(CO_2)$ is a natural component of the atmosphere and is essential for photosynthesis in plants. While it is a greenhouse gas contributing to global warming,it is not classified as a primary air pollutant in the same sense as $CO$,$SO_2$,or hydrocarbons,which are toxic or harmful to human health and the environment at lower concentrations. Therefore,$CO_2$ is generally not considered an air pollutant under standard definitions.

Which of the following is generally not considered an air pollutant?

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