Which one of the following is NOT a constituent of photochemical smog?

Correct option is C

Explanation:
Photochemical smog is a type of air pollution that occurs when sunlight reacts with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides (NOx). The key constituents of photochemical smog include ozone, peroxy acetyl nitrate (PAN), and peroxy benzoyl nitrate.
· Ozone is formed by the reaction of sunlight with these precursors and is a major component of photochemical smog, contributing to its harmful effects on human health and the environment.
· Peroxy Acetyl Nitrate is also a product of these photochemical reactions and contributes to the secondary pollutant formation.
· Peroxy Benzoyl Nitrate is another nitrate that forms under similar conditions in the presence of sunlight.
On the other hand, Polycyclic Aromatic Hydrocarbons (PAHs) are typically produced from incomplete combustion of organic matter, such as fossil fuels, and are not primary constituents of photochemical smog. They are more associated with soot and particulate matter pollution.
Information Booster:
· Photochemical Smog Formation: Primarily occurs in urban areas with heavy traffic and sunny weather, where VOCs and NOx interact in the presence of sunlight.
· Health Effects: Ozone can cause respiratory problems, eye irritation, and other health issues, while other components can lead to cardiovascular problems.
· Environmental Impact: Photochemical smog can damage crops and other vegetation, reducing agricultural productivity.
· Mitigation Strategies: Reducing vehicle emissions, promoting public transport, and using cleaner fuels are essential steps in controlling photochemical smog.
· Regulatory Standards: Many countries have air quality standards to monitor and manage the levels of smog constituents to protect public health and the environment.
Additional Information:
· Option (a) Peroxy Benzoyl Nitrate: A significant component of photochemical smog that contributes to ozone formation.
· Option (b) Ozone: A well-known component of photochemical smog, it forms through photochemical reactions in the atmosphere.
· Option (c) Polycyclic Aromatic Hydrocarbons: Not a component of photochemical smog; they are primarily produced from combustion processes and are more associated with soot.
· Option (d) Peroxy Acetyl Nitrate: Another key constituent that forms during photochemical reactions and contributes to smog's harmful effects.