SO3 or the Blue Plume is not as notorious as SO2, Hg or HCl – but nonetheless is an air pollutant to be reckoned with. “Quick Facts: SO3 Control – Not Just to Cure the Blues!” offers brief questions and answers about what it is and how and why it should be treated – most notably its impact on Mercury capture. More in-depth information can be found on www.solvair.us. Keep on the lookout for future issues of Quick Facts, which will address air pollution control and the concerns facing coal-fired power plants, energy-from-waste, municipalities, industrial boilers, and pulp & paper mills. Stay tuned!