Question

The statements that are TRUE : (A) methane leads to both global warming and photochemical smog (B) methane is generated from paddy fields (C) methane is a stronger global warming gas than CO₂ (D) methane is a part of reducing smog. Choose the most appropriate answer from the options given below :

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

Hint:

Photochemical smog is "oxidizing" in nature (NOx, O₃, hydrocarbons), whereas Classical smog is "reducing" ($SO_2$).

Answer 1

The Correct Option is B

Step 1: Methane ($CH_4$) is a primary greenhouse gas and a precursor to ground-level ozone, contributing to **photochemical smog**.
Step 2: Anaerobic conditions in **paddy fields** result in significant methane emissions.
Step 3: Methane has a higher Global Warming Potential (GWP) than $CO_2$.
Step 4: **Reducing smog** (Classical smog) is characterized by $SO_2$ and particulate matter, not methane.