How can we reduce smog in cities?

In one line

The rule

Smog is a type of air pollution formed when smoke and fog mix, mainly due to pollutants from vehicles, industries, and burning waste.

There is no single formula, but the key is: less pollution = less smog.

Let's understand it simply

Imagine you are in Delhi during winter. You see a thick, grey cloud near the ground. That is smog (smoke + fog). It makes your eyes water and your throat itch. Smog forms when dirty air from cars, factories, and burning garbage mixes with fog. Think of it like when you cook in the kitchen and forget to turn on the exhaust fan — the smoke stays inside and makes it hard to breathe. Now, imagine the whole city is like that kitchen. To clear the air, you need to stop making so much smoke and let fresh air in.

How it works

1. Reduce vehicle emissions: Use public transport, carpool, cycle, or walk. Fewer cars mean less smoke.
2. Switch to cleaner fuels: Use CNG (compressed natural gas), electric vehicles, or solar power instead of petrol or diesel.
3. Control industrial pollution: Factories must use filters (chimney filters) and follow rules to limit smoke.
4. Stop burning waste: Do not burn leaves, plastic, or garbage. Compost kitchen waste or use city waste collection.
5. Grow more plants: Trees and plants clean the air by absorbing pollutants.
6. Smart city solutions: Use technology to monitor air quality and manage traffic to reduce jams and pollution.

The story behind it

The word "smog" was first used in London, England, in the early 1900s. The city had many factories and people burned coal for heat. In 1952, London had a disaster called the "Great Smog" — thick smog covered the city for days, causing thousands of deaths. This tragedy made people realize how dangerous air pollution can be. Since then, cities worldwide have worked to reduce smog by controlling pollution.

Where you see it in real life

• Delhi in winter: Smog covers the city due to crop burning in nearby states and vehicle pollution.
• Mumbai traffic jams: Exhaust from thousands of vehicles mixes with humid air, creating smog.
• Factories near Kanpur: Industrial smoke without filters adds to city smog.
• Burning garbage in small towns: Open burning of waste releases harmful gases, making the air hazy.
• Diwali crackers: Fireworks release smoke and chemicals, causing smog after celebrations.
• Smart traffic lights in Pune: These help reduce vehicle idling and pollution, cutting down smog.

Why it matters

• Health: Smog causes breathing problems, asthma, and eye irritation, especially in children and elders.
• Environment: Smog damages plants and reduces sunlight, affecting crops and gardens.
• Economy: Poor air quality means more sick days, lower work productivity, and higher medical costs.
• Future: Reducing smog now helps fight climate change and makes cities better for the next generation.

Worked example

Let's say a city wants to reduce smog:

Given: 10,000 cars in the city, each car emits 2 kg of pollutants per day.
Step 1: Calculate total pollution per day = 10,000 × 2 = 20,000 kg
Step 2: If half the people use buses or cycles, cars on road = 5,000
Step 3: New pollution per day = 5,000 × 2 = 10,000 kg
Step 4: Pollution is reduced by 10,000 kg per day, so smog will decrease.

Common mistakes

• Thinking smog is only fog: Smog is fog mixed with smoke and chemicals, not just water vapor.
• Burning waste to get rid of it: Burning garbage makes smog worse; compost or recycle instead.
• Believing only the government can help: Every person can help by using less polluting transport and not burning waste.
• Ignoring indoor pollution: Smog can enter homes; using air purifiers and keeping windows closed on smoggy days helps.

Remember it

Smog = smoke + fog. Less smoke, less smog. Every small action counts to clear the air.