From NCERTAsked by Anonymous from Mountain View, United States5 Oct 2026, 8:10 AM ISTUpdated
In one line
Rain makes the sky look clearer because it washes away dust and pollution from the air.
Rain — Form of precipitation Rain falling in a city, which helps wash away dust and pollution from the air Image: Wikipedia
The rule
Rain helps clean the air by removing dust, smoke, and other particles, making the sky appear clearer.
Let's understand it simply
Imagine you are in a room full of chalk dust. The air looks foggy, and you cannot see clearly. Now, if someone sprays water, the dust settles down, and the air becomes clear again. Rain does the same thing outside. The raindrops catch dust and dirt as they fall, pulling them down to the ground. After the rain, there is less dust in the air, so the sky looks blue and clear.
How it works
Dust, smoke, and tiny particles float in the air, making the sky look hazy (unclear).
When it rains, water droplets fall from the clouds.
These droplets stick to dust and pollution in the air.
The raindrops become heavier and fall to the ground, carrying the dirt with them.
After the rain, there are fewer particles left in the air, so the sky looks much clearer.
How rain clears the sky
Dust and smoke float in the air
Rain starts falling from clouds
Raindrops catch dust and pollution
Raindrops carry dirt to the ground
Air becomes cleaner and sky looks clearer
The story behind it
Scientists have studied how rain cleans the air for many years. The process is called wet deposition (removal of particles by rain). It is a natural way the Earth keeps its air clean. This idea is used in air-purifying machines and even in cleaning city roads with water.
Where you see it in real life
After a heavy monsoon shower in your city, you notice the sky is bright blue and you can see far away — rain has cleaned the air.
During Diwali, the sky is smoky from crackers, but after it rains, the smoke disappears — rain removes the pollution.
In villages, after the first rain, the air smells fresh and the sky looks clean — dust from the fields is washed down.
On busy roads, traffic creates a lot of dust. After rain, the dust settles, and the air feels fresher.
Why it matters
Clean air is healthier for our lungs and helps us breathe better.
Plants and animals also benefit from cleaner air after rain.
Clear skies allow sunlight to reach the ground, which helps plants grow.
Scientists use this knowledge to understand air pollution and how to control it.
Common mistakes
Thinking rain only waters plants — it also cleans the air.
Believing the sky is always blue after rain — if there is still pollution or clouds, it may not look clear.
Remember it
When rain falls, it acts like a giant broom, sweeping dust and dirt out of the sky.
Check yourself
Why does the sky look clearer after rain?
Because rain removes dust and pollution from the air.
What do raindrops do to dust in the air?
They catch the dust and bring it down to the ground.
Why is clean air important after rain?
It helps us breathe better and is good for plants and animals.
Can the sky still look cloudy after rain? Why?
Yes, if there are still clouds or pollution left, the sky may not look clear.
Quick recap
Rain removes dust and pollution from the air.
Raindrops catch and carry particles to the ground.
