Correct statement about smog is

We need to identify the correct statement about smog.

Classical smog:

• Occurs in cool, humid climate
• Contains smoke, fog, and $$\text{SO}_2$$
• $$\text{SO}_2$$ makes it a reducing smog
• Does NOT contain $$\text{NO}_2$$ as a primary component

Photochemical smog:

• Occurs in warm, dry, sunny climate
• Contains $$\text{NO}_2$$, ozone, PAN, formaldehyde
• Has high concentration of oxidizing agents (ozone, PAN, NO₂)

Evaluating each option:

Option A: "$$\text{NO}_2$$ is present in classical smog" — Incorrect. $$\text{NO}_2$$ is in photochemical smog, not classical.

Option B: "Both $$\text{NO}_2$$ and $$\text{SO}_2$$ are present in classical smog" — Incorrect. $$\text{NO}_2$$ is not in classical smog.

Option C: "Photochemical smog has high concentration of oxidizing agents" — Correct. Ozone and PAN are strong oxidizing agents.

Option D: "Classical smog also has high concentration of oxidizing agents" — Incorrect. Classical smog is reducing in nature.

The answer is Option C.