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Adsorbent combination studies have been carried out to remove nitrogen dioxide (NO 2 ) and volatile organic compounds (VOCs: BTEX) out of a subway environment characterized by high flow and low concentration. Optimal conditions for the high removal efficiency of the concerned target compounds were obtained through testing a series of control factors such as adsorbent sorts, thicknesses, and superficial velocity. It was found that the efficiencies increased as the specific surface area ofdoi:10.5572/ajae.2011.5.2.113 fatcat:ixsihnzhlvcklpffzpsobukp3i