The first emissions swaps have been traded in the U.S., which participants view as the beginnings of a financially settled over-the-counter market. Last month, Cantor Fitzgerald Environmental Brokerage Services and Evolution Markets each brokered a fixed-to-floating emissions swap of 15,000 and 2,500 sulfur dioxide allowances respectively. The deal was priced off the Argus Air Daily index. Cantor Fitzgerald is working on another SO2 swap, according to Craig Poler, manager of emissions and fuels in New York.