Description:

The correct answer is:

✅ Smog

Why?

Smog (smoke + fog) is a direct result of air pollution mixing with sunlight or fog:

Primary Pollutants: Vehicle exhaust, factory emissions (NOx, VOCs, PM2.5).

Photochemical Reaction: Sunlight transforms these into ozone and haze (e.g., Los Angeles smog).

Health Impact: Linked to asthma, lung damage, and reduced visibility.

Why Not the Others?

❌ Fog: Natural condensation (unrelated to pollution).

❌ Sleet: Frozen raindrops (a weather event).

Fun Fact: The term "smog" was coined in 1905 to describe London’s coal-polluted fogs! 🏭🌫️

Bonus: Masks and air purifiers help combat smog’s effects. 😷💨