Declining, seasonal-varying emissions of sulfur hexafluoride from the United States point to a new mitigation opportunity. - Hu, Lei; Ottinger, Deborah; Bogle, Stephanie; Montzka, Stephen; DeCola, Phil; Dlugokencky, Ed; Andrews, Arlyn; Thoning, Kirk; Sweeney, Colm; Dutton, Geoff; Aepli, Lauren; Crotwell, Andrew (EGUsphere, 2022)