Question

In which of the following cities photochemical smog is minimum?

• A. New Delhi
• B. Mumbai
• C. J & K
• D. Kolkata

Hint:

Photochemical smog is more prevalent in warm and sunny conditions due to higher photochemical activity

Answer 1

The Correct Option is C

Photochemical Smog in Cities

The amount of photochemical smog in a city depends on several factors, including the level of air pollution, the weather conditions, and the topography of the region.

Without knowing the current levels of air pollution in each city, it is difficult to determine which city has the minimum photochemical smog.

However, based on historical data and trends, it can be said that cities with lower levels of air pollution and well-implemented pollution control measures are likely to have lower levels of photochemical smog.

In recent years, New Delhi and Kolkata have been known to have high levels of air pollution, which has led to severe cases of photochemical smog during certain seasons. On the other hand, J&K is a mountainous region with lower levels of industrial activity and is less likely to have high levels of photochemical smog. Mumbai, being a coastal city, is also less prone to photochemical smog.

Therefore, if current air pollution levels are not known, we cannot determine with certainty which of the four cities has the minimum photochemical smog. However, in general, cities with lower levels of air pollution and well-implemented pollution control measures are more likely to have lower levels of photochemical smog.

The correct answer is (C) J & K

Answer 2

Photochemical Smog Formation 

Key Points:

• Photochemical smog is formed due to the reaction of pollutants in the presence of sunlight.
• The major pollutants involved are:
  • Nitrogen oxides (NO_x)
  • Volatile organic compounds (VOCs)
• These pollutants react in sunlight to form ground-level ozone and other secondary pollutants.

Factors Influencing Smog Formation:

• Sunlight: Required to drive the chemical reactions.
• Temperature: Higher temperatures can enhance smog formation.
• Wind and Topography: Affect pollutant dispersion.
• Concentration of Pollutants: Dependent on traffic and industrial activity.

Comparison of Cities:

• New Delhi, Mumbai, and Kolkata: High vehicular traffic and industrial activity contribute to higher smog levels.
• Jammu and Kashmir (J&K): Lower urbanization and industrialization suggest lower levels of pollutants, making it less likely to experience high levels of photochemical smog.

Conclusion:

Answer: Based on general urbanization and pollution levels, Jammu and Kashmir (Option C) may have the minimum photochemical smog. However, a definitive conclusion requires specific data on pollutant concentrations in each city.