Abstract: A regional lung deposition system including a throat simulation device, an electrostatic neutralizer, and a first filter positioned within a first filter housing. The electrostatic neutralizer is positioned downstream of an in fluid communication with the throat simulation device. The filter housing is positioned downstream of and in fluid communication with the electrostatic neutralizer. The first filter that is positioned within the filter housing is downstream of the throat simulation device and the electrostatic neutralizer. The regional lung deposition system mimics tracheobronchial (TB) deposition of pharmaceutical aerosols emitted by commercially available dry powder inhalers (DPIs) to provide an in vitro method to rapidly evaluate regional lung doses delivered by pharmaceutical inhalers directly using variable inhalation profiles.