Zhou SS, et al. - Authors estimated the relative contributions of a mask, valve, and Micro Ventilator on aerosol filtration efficiency of a new N95 respiratory face mask. As per data, protection against both small- and large-size pathogens was provided by the masks, with or without features intended for enhancing comfort. For filtration of pathogens, including influenza and rhinoviruses, as well as the fine particulates (PM_2.5) present in aerosols that represented a greater challenge for many types of dental and surgical masks, the mask appeared to be highly efficient. Therefore, this individual-use N95 respiratory mask was rendered as an improvement over the former types of masks for protection against a variety of environmental contaminants including PM_2.5 and pathogens such as influenza and rhinoviruses.