Abstract: Systems and methods for removing toxic emissions from flue gas of coal fired combustions units can be achieved. Decreasing nitrogen oxide and sulfur emissions from a coal fired circulating fluidized bed reactor can include treating flue gas using a selective catalytic reduction system and a wet scrubber. Furthermore, reducing the nitrogen oxide emissions from a pulverized coal reactor can be accomplished with a selective non-catalytic reduction system. Additionally, the reduction of sulfur oxide emissions from a pulverized coal reactor can be enhanced using dry and/or wet scrubbers. Such systems and methods provide improved levels of toxic emissions over currently available technologies.