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Environmental regulations have turned their focus on controlling and mitigating air emissions that contribute to abundant air pollution. The primary pollutants found in air emissions from stack discharges are NO_x, SO_x, particulates and smog. With continued federal action by the EPA, coupled with action from state and local regulatory agencies, mitigation of air pollution containing harmful pollutants can be achieved to a certain scale. This chapter will focus on the harmful effects of sulfur dioxide (SO₂), considered the most harmful intentionally discharged air pollutant to the environment. Due to its impact in the form of acid rain and, on a larger scale, ozone depletion, SO₂ mitigation is a high priority. Additionally, methods and equipment used as well as being developed for use will be discussed for their ability to effectively treat stack discharges and mitigate SO₂ pollution.