Question

Photochemical smog formation in ambient atmosphere requires:
A. Volatile hydrocarbon
B. Ozone
C. SO2
D. Sunlight Temperature
E. NOx
Choose the correct answer from the options given below:

• A. (A) and (D) only
• B. (A), (B), (C) and (D) only
• C. (B), (C), (D) and (E) only
• D. (A), (D) and (E) only

Hint:

Smog formation peaks in urban areas with high vehicle emissions, as NOX and hydrocarbons react under sunlight.

Answer 1

The Correct Option is D

1. Photochemical smog requires volatile hydrocarbons (A), sunlight/temperature (≥25°C) (D), and nitrogen oxides (NO_X) (E).
2. Ozone (B) and sulfur dioxide (C) may contribute but are not essential for initial formation.