define pollution in short answers
Answers
Answer:
The act or process of polluting or the state of being polluted, especially the contamination of soil, water, or the atmosphere by the discharge of harmful substances.
Explanation:
Pollution is the introduction of harmful materials into the environment. ... These harmful materials are called pollutants.
Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff
produced by factories. Pollutants damage the quality of air, water, and land
Air pollution refers to any physical, chemical or biological change in the air. It is the contamination of air by harmful gases, dust and smoke which affects plants, animals and humans drastically.
There is a certain percentage of gases present in the atmosphere. An increase or decrease in the composition of these gases is harmful to survival. This imbalance in the gaseous composition has resulted in an increase in earth’s temperature, which is known as global warming.
Types of Air Pollutants
There are two types of air pollutants:
Primary Pollutants
The pollutants that directly cause air pollution are known as primary pollutants. Sulphur-dioxide emitted from factories is a primary pollutant.
Secondary Pollutants
The pollutants formed by the intermingling and reaction of primary pollutants are known as secondary pollutants. Smog, formed by the intermingling of smoke and fog, is a secondary pollutant.