Photochemical Smog Cause: Identifying PAN
Photochemical smog is a type of air pollution formed when emissions from vehicles and industries react with sunlight.
The key components contributing to photochemical smog include:
- Nitrogen oxides ($NO_x$)
- Volatile organic compounds (VOCs)
- Sunlight
These react in the atmosphere to form harmful secondary pollutants.
Analyzing the Options
Let's examine the given options:
- CFC (Chlorofluorocarbons): Primarily known for depleting the stratospheric ozone layer, not a direct cause of ground-level photochemical smog.
- PAN (Peroxyacetyl Nitrate): A major component and eye irritant found in photochemical smog, formed from the reaction of $NO_x$ and hydrocarbons in the presence of sunlight.
- Fused benzene ring compound: These are typically polycyclic aromatic hydrocarbons (PAHs), which are air pollutants but not the defining cause of photochemical smog.
- Heavy metal: Such as lead or mercury, these are toxic pollutants resulting from industrial processes or combustion but do not directly cause photochemical smog reactions.
Therefore, PAN is the correct identification among the choices provided as a cause and component of photochemical smog.
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