text: Since stringent environmental regulations limiting  emissions have been enacted in many countries,  is being removed from flue gases by a variety of methods. Common methods used:
  *Wet scrubbing using a slurry of alkaline sorbent, usually limestone or lime, or seawater to scrub gases;
  *Spray-dry scrubbing using similar sorbent slurries;
  *Wet sulfuric acid process recovering sulfur in the form of commercial quality sulfuric acid;
  *SNOX Flue gas desulfurization removes sulfur dioxide, nitrogen oxides and particulates from flue gases;
  *Dry sorbent injection systems that introduce powdered hydrated lime (or other sorbent material) into exhaust ducts to eliminate  and  from process emissions.
  For a typical coal-fired power station, flue-gas desulfurization (FGD) may remove 90 per cent or more of the  in the flue gases.