Per- and polyfluoroalkyl substances (PFAS) are found in many products, from consumer products to building materials. For airports, the primary implication is associated with aqueous film-forming foams (AFFFs) used in firefighting. For many years, airport operators were required to use AFFFs and, as a result of recommended training requirements and fire response, may have had releases of AFFFs to the environment. ACRP Research Report 262: PFAS Management at Airports: A Guide , from TRB’s Airport Cooperati…