Ryan Chartier is a Chemist in RTI International’s Discovery Science and Technology Division. Mr. Chartier is applying his knowledge of atmospheric and aerosol chemistry to help establish the operating parameters of RTI’s personal exposure monitoring technology (MicroPEM™) based on the optical properties of target forms of particulate matter. Additionally, he has used the wavelength dependent optical density of particulate matter collected on the MicroPEM’s internal filter to improve strong emission source characterization. The development of this state of the art device helps to better quantify the personal exposure levels and patterns of the most exposed people (women and children) to hazardous particulate matter. With a focus on biomass cookstove emissions, he is designing and performing laboratory experiments, he supervising the deployment of MicroPEMs in international field studies (Bangladesh, India, Kenya, Malawi, Sri Lanka) and has managed the processing, analysis, and interpretation of the associated data. He serves on technical working group under Global Alliance for Clean Cookstoves (GACC) and the ANSI / ISO cookstoves standards development initiative. He holds a Masters degree in Analytical Chemistry (University of New Hampshire).