The Stone research group integrates environmental, analytical, and organic chemistry in the study of atmospheric particulate matter, or aerosols. Our goal is to better understand aerosol sources and their effects on health and climate through detailed chemical measurements. Analytical methodology, such as chromatography and mass spectrometry, are developed to more accurately characterize aerosol chemistry. The chemical profiles of aerosols collected in the field are combined with laboratory experiments and source apportionment models to evaluate the magnitude of pollution sources and gain insight to aerosol transformations.