Question

Dust and smoke cause ________ of air when present in excess.

Answer 1

Pollution:

1. Pollution refers to the introduction of any substances that harm the environment.
2. It is majorly of three types: water pollution, land pollution, and air pollution.
3. The introduction of dust, smoke and toxic gaseous substances in the air leads to air pollution.

Final answer: Dust and smoke cause pollution of air when present in excess.