A bi-component polymer fibers-entrapped KOH/Al2O3 sorbent (PFES) is designed for SO2 removal from air. Due to the microfibrous media and supported sorbent design, PFES demonstrated superior SO2 removal performance as compared with a packed bed. At equivalent (10 wt%) KOH loading, the PFES yielded 50% higher breakthrough capacity than that for KOH/Al2O3 sorbent in the packed bed. This is attributed to the high contact efficiency of small particulates, high KOH utilization, and high accessibility of KOH. The other sorbents including KMnO4/Al2O3 and MnO2/Al2O3 are also being entrapped in microfibrous sheets and investigated for their SO2 removal efficiency. The use of these novel microfibrous entrapped sorbents provides reduced external mass transfer resistance enhancing adsorption rate. Similar entrapped sorbents will be developed for the air contaminants other than SO2 including NOx and VOCs.