University of North Dakota Energy and Environmental Research Center (UNDEERC) is addressing the impact that selective catalytic reduction (SCR), selective noncatalytic reduction (SNCR), or flue gas conditioning systems have on total mercury emissions and on the speciation of mercury. Based on the Information Collection Request (ICR) results to date, it appears that there is a significant lack of pertinent and reliable information on mercury speciation for coal-fired plants that have low-NOx systems. SCR units have the potential to achieve high levels of NOx reduction by reducing NOx to N₂ and H₂O in the presence of a catalyst, vanadium/tungsten - titanium metal oxide. Bench and pilot-scale test results indicates that metal oxides, including vanadium and titanium, have the potential to promote the formation of oxidized Hg and/or particulate-bound mercury in relatively simple flue gas mixtures. The SNCR process is similar to the SCR approach but uses a reagent, most likely urea, to react with the NOx to form N₂ and H₂O. Therefore, mercury speciation impacts could be different for SCR and SNCR.