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Hazardous pollutants such as NOx (NO and NO2) and SO2 generally come from fossil fuel combustion, harm the human respiratory system, and damage environmental ecosystems. The conventional technology that has been used so far consists of two methods: FGD (Flue Gas Desulfurization) and SCR (Selective Catalytic Reduction) or SNCR (Selective Non-Catalytic Reduction) to remove SO2 and NOx. The study aims to examine the performance of polysulfone membranes in removing NOx and SO2 simultaneously using hydrogen peroxide (H2O2) and sodium hydroxide (NaOH) solutions as absorbents. The presence of H2O2 and NaOH in absorbent solutions plays a role in oxidizing NOx into soluble species in water and in absorbing SO2 gas, respectively. During the experiment, the feed gas flowed through the lumen fiber and then passed through the fiber to the shell side of the membrane module, where the reaction happened between NOx and SO2 and the absorbent. The experimental results showed that the presence of SO2 affected the NOx reduction efficiency. The NOx and SO2 removal efficiencies decreased with the feed gas flow. This study's maximum NOx and SO2 reduction efficiencies were 93.9 and 99.8%, respectively.