In the studies by Bianchini et al. (2016), efficiencies of60.36% in PM2.5 removal were obtained for a water flow rateof 5 L/min, comparable to those obtained in this work. They 1 3are higher even than some PM 2.5 washing systems used byBianchini et al. (2016), such as the tower wash (28.25%) andthe bubble column (58.65%). Mi and Yu (2012) obtainedremoval efficiencies for the 10 μm and 45 μm particles over95.1% and 92.7%, respectively, which shows that the col-lection efficiencies obtained for PM larger than 2.5 μm werenotable. Ali et al. (2013) obtained overall collection efficien-cies of PM ranging from 95 to 99% for different gas veloci-ties at the throat (130 to 200 m/s).