Sulphur dioxide (SO2) is removed from flue gases via Flue Gas Desulfurization (FGD) systems, a group of technologies used in power stations and other industrial facilities that use fossil fuels. Acid rain, which can be damaging to both the environment and human health, is a result of SO2 emissions. Systems using FGD can aid in lowering these pollutants and enhancing air quality.

A small collection of technologies known as Flue Gas Desulfurization (FGD) is used to remove sulphur dioxide (SO2) from the exhaust flue gases of fossil fuel power plants as well as from other processes that produce sulphur oxide, such as waste incineration. Flue-gas desulfurization (FGD) systems have been used to lower sulphur dioxide (SO2) emissions from coal-fired power plants since the late 1960s. After fly ash, the solids produced by FGD systems make up the second-largest stream of coal combustion products (CCPs).

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