Question

Photochemical smog pollution does not contain:

• A. ozone
• B. nitrogen dioxide
• C. carbon dioxide
• D. PAN (Peroxy acyl Nitrate)

Answer 1

The Correct Option is C

Photochemical smog is a type of air pollution caused by the reaction of sunlight with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. This complex chain of reactions leads to the formation of a mixture of pollutants. The primary components of photochemical smog include ozone (O₃), nitrogen dioxide (NO₂), and peroxyacetyl nitrate (PAN).

Let's analyze each component given in the options:

• Ozone (O₃): Ozone is a major secondary pollutant in photochemical smog. It is formed when NOx and VOCs react in the presence of sunlight.
• Nitrogen Dioxide (NO₂): This reactive gas is a significant precursor to the formation of ozone and is a part of the photochemical smog itself.
• Carbon Dioxide (CO₂): Although carbon dioxide is a greenhouse gas and contributes to global warming, it is not a component of photochemical smog. It does not participate in the reactions that produce smog. Thus, it does not contain in photochemical smog.
• Peroxyacyl Nitrate (PAN): This is a secondary pollutant formed from the reaction of nitrogen dioxide and VOCs. It is a definite component of photochemical smog.

Based on this analysis, carbon dioxide is not a part of photochemical smog. While it is a significant environmental and climate concern, it doesn't contribute to or form part of the complex reactions that produce photochemical smog.

Therefore, the correct answer is carbon dioxide.