The formation of SO_3 in a coal-fired power plant has many undesirable consequences on the plant's equipment and emissions, presenting the need for a reliable and accurate monitoring method to help minimize adverse effects. High concentrations of SO_3 can cause corrosion, fouling and plugging of plant equipment, forcing replacement of hardware and stricter limitations on load [R.K. Srivastava et al., 2002]. SO_3 also reacts with moisture in the stack to form fine droplets of sulfuric acid at the stack exit; these droplets scatter light and cause a visible "blue plume" that leads to an unfavorable perception of the plant's environmental impact.
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