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Which of the following is a primary pollutant that contributes to the formation of smog?

Option: 1

Ozone (O_3)

Option: 2

Nitrogen dioxide (NO_2)

Option: 3

Methane (CH_4) 


Option: 4

Carbon dioxide (CO_2)

Answers (1)


The primary pollutant that contributes to the formation of smog is nitrogen dioxide (NO_2). Smog is a type of air pollution that occurs when pollutants such as nitrogen oxides, volatile organic compounds (VOCs), and particulate matter react with sunlight to form a mixture of ozone, nitrogen dioxide, and other compounds.

Nitrogen dioxide (NO_2)  is a reddish-brown gas that is commonly emitted from vehicle exhaust and power plants. It is a highly reactive compound that can easily react with other pollutants to form ozone and other harmful compounds. (NO_2) is also a major contributor to the formation of acid rain and can cause respiratory problems in humans.

Ozone (O_3) is another primary pollutant that is formed in the presence of sunlight, but it is not directly emitted into the atmosphere. Instead, it is formed through a complex series of chemical reactions involving nitrogen oxides (NO_x) and VOCs. Methane (CH_4) and carbon dioxide (CO_2) are greenhouse gases that contribute to global warming, but they are not primary pollutants that contribute to the formation of smog.

Overall, nitrogen dioxide (NO_2) is a primary pollutant that plays a significant role in the formation of smog and other types of air pollution. Reducing emissions of (NO_2)  from vehicles, power plants, and other sources can help to improve air quality and reduce the negative health impacts of smog.


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