What is Smog?

Every winter, cities like Delhi disappear under a thick grey blanket. But this isn’t just fog — it’s smog, a deadly cocktail of smoke + fog, caused by vehicle emissions, industrial pollution, crop burning, and weather conditions.

Smog is not just an eyesore — it’s a silent killer. It seeps into your lungs, increases the risk of asthma, heart disease, and even cancer, and can reduce visibility so drastically that flights and traffic come to a standstill.

But how is smog formed? What’s the difference between London-type and Los Angeles-type smog? Why does it get worse in winters? And more importantly — what can be done to stop it?

In this video, we break down the science of smog in the simplest way possible — perfect for students, UPSC aspirants, and anyone who wants to breathe cleaner air.

Let’s understand what we’re breathing — and what we need to change.

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