EPA is taking direct final action on amendments to the sulfur dioxide air emission standards for stationary combustion turbines that burn biogas (landfill gas, digester gas, etc.). Without these amendments, owners/operators of new stationary combustion turbines burning biogas containing relatively low amounts of sulfur-containing compounds will be required to install pretreatment facilities to remove the sulfur compounds prior to combustion or to install post combustion controls to lower sulfur dioxide emissions. It was not EPA's intent to require the use of either of these approaches, and the costs associated with either approach are substantially greater than the environmental benefit resulting from the decrease in sulfur dioxide emissions.