Flue Gas Desulfurization (FGD) is a technology used to remove sulfur dioxide (SO₂) from the exhaust gases of fossil fuel power plants. This process helps reduce air pollution and is essential for meeting environmental regulations. FGD systems typically use a chemical reaction to convert SO₂ into a solid or liquid form, which can then be safely disposed of or reused. There are various methods of FGD, including wet scrubbing, dry scrubbing, and semi-dry scrubbing. Each method has its advantages and is chosen based on factors like cost, efficiency, and the specific requirements of the power plant. Overall, FGD plays a crucial role in improving air quality.