Why Indoor Chemistry Matters

People spend the vast majority of their time inside their homes and other indoor environments where they are exposed to a wide range of chemicals from building materials, furnishings, occupants, cooking, consumer products, and other sources. Despite research to date, very little is known about how exposures to indoor chemicals across complex chemical phases and pathways affect human health. The COVID-19 pandemic has only increased public awareness of indoor environments and shed light on the many outstanding questions about how best to manage chemicals indoors. This report identifies gaps in current research and understanding of indoor chemistry and new approaches that can be applied to measure, manage, and limit chemical exposures. Why Indoor Chemistry Matters calls for further research about the chemical transformations that can occur indoors, pathways and timing of indoor chemical exposure, and the cumulative and long-term impacts of exposure on human health. Research priorities should consider factors that contribute to measurable environmental health disparities that affect vulnerable populations, such as the age, location, and condition of buildings that can alter exposures to indoor chemicals. Table of Contents Front Matter Summary 1 Introduction 2 Primary Sources and Reservoirs of Chemicals Indoors 3 Partitioning of Chemicals in Indoor Environments 4 Chemical Transformations 5 Management of Chemicals in Indoor Environments 6 Indoor Chemistry and Exposure 7 A Path Forward for Indoor Chemistry Appendix A: Glossary Appendix B: Committee Biosketches Appendix C: Open Session Agendas Appendix D: Summary Table of Available Exposure Models