Answer:
Particulate matter
Step-by-step explanation:
The particulate matters are defined as the aerosol particles that are found to be present freely in the atmosphere. They are the mixture of dust, soil, salt, liquid drops, smoke and ashes. They can be formed both naturally and from the anthropogenic activities. These smaller particles present in the water vapor undergoes condensation, forming liquid and ice on the surfaces of dust particles present in the atmosphere. With more frequent condensation of water vapor, results in the formation of clouds.