Which of the following is a key ingredient in the formation of photochemical smog ? 

The correct answer is - Nitrogen oxides (NOx)

Key Points

• Nitrogen oxides (NOx)
  • Nitrogen oxides are a group of highly reactive gases that play a critical role in the formation of photochemical smog.
  • These gases contribute to the formation of ground-level ozone, which is a major component of photochemical smog.
  • NOx gases are primarily emitted from motor vehicles, power plants, and industrial facilities.
  • Photochemical smog occurs when NOx gases react with volatile organic compounds (VOCs) in the presence of sunlight.

Additional Information

• Formation of Photochemical Smog
  • Photochemical smog is a type of air pollution that is formed when sunlight interacts with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs).
  • The reaction between NOx and VOCs produces ozone and other secondary pollutants.
  • Photochemical smog is characterized by its brownish haze and is most common in urban areas with high traffic and industrial activity.
• Health and Environmental Effects
  • Photochemical smog can cause a variety of health problems, including respiratory issues, eye irritation, and exacerbation of asthma.
  • It can also have harmful effects on the environment, such as damaging crops, forests, and aquatic ecosystems.
• Mitigation Measures
  • Reducing emissions from vehicles and industrial sources is key to controlling the formation of photochemical smog.Adopting cleaner technologies and fuels, implementing strict emission standards, and promoting public transportation can help mitigate the issue.