Perhaps you have heard the saying, “if you can measure it, you can manage it.” Though this management adage applies to a variety of situations, it presents a particularly important principle within an environment and health context. Environmental impacts and determinants of health are frequently silent, pervasive and often invisible, paricularly in underserved regions. Developing and implementing innovative

The work by Roth et al. concerned the profile of per- and polyfluoroalkyl substances (PFAS) in air-phase samples taken over an aqueous film-forming foam (AFFF) solution.(1) We question the identification of perfluorooctanoate (PFOA) and other perfluorocarboxylates (PFCAs) in the headspace of an AFFF solution. In this comment, PFOA denotes the anionic species of the compounds, whereas PFOA-H denotes

We appreciate the interest from Titaley et al.(1) in our recent publication. To facilitate critical evaluation of our work, we provided more than 50 pages of Supporting Information including mass spectra of 32 compounds alongside the original article.(2) We are happy to see that the efforts to provide such detail has allowed for a critical review of our interpretation. Titaley et al. questioned the