This grant supports a joint project by environmental engineer William Nazaroff and atmospheric chemist Allen Goldstein at the University of California, Berkeley to study chemical emissions from human occupancy in indoor spaces. Nazaroff and Goldstein will develop suitable sampling and analysis protocols for simultaneous indoor and outdoor measurements of airborne gaseous and particulate species and measure indoor and outdoor air concentrations in university classrooms, both while vacant and while occupied.  Using these measurements, they will develop models to compute emission rates for a spectrum of organic and inorganic chemicals associated with human occupancy.  The team expects to produce at least two peer-reviewed articles and will present their findings at national and international meetings.  They will also prepare a short report that outlines important research questions and obstacles to be overcome in order to advance our understanding of indoor chemistry.  Grant funds also provide support for the training of one postdoctoral fellow.