Following are the types of pollution : 

• Air pollution : Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into the Earth’s atmosphere. Carbon dioxide is the main air pollutant. Due to increase in air pollution, acid rain is caused. Gas emitted from industrial pollution, i.e. sulphur dioxide, nitric dioxide and carbon dioxide enter the atmosphere, and form sulphuric acid, nitric acid and carbolic acid, which fall on earth along with rain.
• Water Pollution : Activities taking place in the environment which cause deterioration of properties of clean water and reduce the supply of clean water are called water pollution. Water is being polluted by mixing of industrial waste materials in sources Of clean water, dissolution of agricultural chemicals with decomposition in clean water resources, lack of proper solid waste disposal system and dissolution of radioactive materials in water. 
• Soil pollution : The upper thin layer of the soil on the earth’s surface is precious for life. Any adverse physical, chemical and biological alteration in it is called soil pollution. 
• Loss of Bio-diversity : Bio-diversity is a vital resource of the earth. Every creature has a specific genetic structure, which is an important natural resource. Various types of plants, living beings and micro organisms are the basis of bio-diversity. 
• Solid waste management : Materials lying in an improper manner and at inappropriate places, which could be used again, but which obstruct the working system of the environment, are called solid waste. The leftover materials from production of nuclear energy are included in nuclear waste. 
• Noise pollution : Unusual and loud sound is called noise. The intensity of sound is measured in decibels. The sound produced in a normal conversation has the intensity of 40- 60 decibels. Loud sound is also harmful for human health. Sound pollution can be controlled by making up various norms and laws, by making changes in the technology and by making changes in the human nature.