Funds from this grant support a team lead by Virginia Tech’s Gabriel Isaacman-VanWertz to improve our ability to detect chemical isomers indoors through the development of a field-deployable gas chromatograph coupled to a chemical ionization mass spectrometer. This proposed research is divided into three technical tasks: First, Issacman-VanWertz will engineer the physical and technical interface between the major instrument components. Then he will characterize and calibrate the new instrument. Finally, he will deploy the instrument in an on-campus controlled indoor environment to examine emissions. The team plans to share their findings through peer-reviewed articles and presentations at several scientific and professional conferences.