On January 17th, 2022, a US Ski and Snowboard (USSS) ban on using perfluorocarbon-based wax products (“fluoros”) at all International Ski Federation-sanctioned (FIS) races in the country went into effect. The action marked the critical point in a rapid evolution of policies meant to limit competitive nordic skiing’s emission of perfluorocarbons, part of a class of especially environmentally persistent, and potentially health-concerning, chemicals known as PFAs. Overnight, The cumulative knowledge of 40 years on...