Question

how does air pollution leads to water pollution

Answer 1

There are lots of sources of water pollution is in the air like toxins, chemicals, dust particles, etc.

That can easily integrate with water sources like rivers, lakes, streams etc.

that's why air pollution leads to water pollution.

Hope it's useful for you.

All the best.

Answer 2

Air pollution caused by many harmful gases like methane and carbondioxide comes in contact with water.This contact leads to release of toxins and make the water pollute.
hope it helps