Sulphur dioxide (SO 2 ) is one of a group of highly reactive gases known as "oxides of sulphur". SO 2 is linked with a number of adverse effects on the respiratory system and other environmental issues. It is an important industrial emission gas which causes several difficulties in the environment like acid rain. Sulphur dioxide is a ubiquitous component of fuel combustion exhausts and one of the first air pollutants to be regulated all over world. Several approaches have been adopted to reduce SO 2 content in the environment. One of the most difficult environmental problems facing industry is how to economically control SO 2 emissions. Conversion of H 2 SO 4 from SO 2, which could be a great impact on reducing pollution. Production of sulphuric acid is one of the best choice considering its economical values and utilities. This paper addresses the different processes to control SO 2 and to use SO 2 in most economic and productive way to reduce SO 2 effect in environment. A review of various treatment methods has been provided and a brief description of each process has been included and their technical applicability is also compared.