Oxidation of NO to NO2 has been proposed as a method for enhancing NOx removals in conventional flue gas desulfurization (FGD) processes. This experimental investigation characterizes the removals of NO2 and SO2 in a 1.1 m3(standard)/min spray dryer/baghouse system. Flue gas was generated by burning a no. 2 fuel oil, which was subsequently spiked upstream of the spray dryer with NO2 or SO2 or both. Lime slurry was injected via a rotary atomizer into the spray dryer. Variables studied include the approach to the adiabatic saturation temperature, stoichiometric ratio, SO2 concentration, and NO2 concentration. Significant quantities of NO2 are scrubbed in this system, and over half of the total removal (at inlet NO2 > 400 ppm) occurs in the baghouse. Increasing NO2 concentrations enhance the amount of NOx removed in the system. Also, the presence of significant quantities of NO2 enhances the baghouse SO2 removal. Although up to 72% NO2 removals were obtained, concentrations of NO2 that exited the system were greater than 50 ppm for all conditions investigated.