For decades, scientists knew there was a huge swath of undetected and unaccounted for per- and polyfluoroalkyl substances (PFAS) in the atmosphere, often referred to as PFAS dark matter, but no one knew how much was missing or how to measure them. For decades, scientists knew there was a huge swath of undetected and unaccounted for per- and polyfluoroalkyl substances (PFAS) in the atmosphere, often referred to as PFAS dark matter, but no one knew how much was missing or how to measure them. Now, a York University atmospheric chemistry research team has devised a way to test for one of the most ubiquitous elements of these potent greenhouse gases. Read more at: York UniversityYork University Atmospheric Professor Cora Young and PhD Candidate Daniel Persaud on the rooftop lab of the Air Quality Research Station. (Photo Credit: York University)