An emission limitation on existing sources in nonattainment areas, defined by the U.S. EPA in a Control Techniques Guideline (CTG) and adopted and implemented by the States. Fed

air pollution abatement equipment that is both technologically feasible and cost effective

The lowest emission limit that a particular source is capable of meeting by the application of control technology that is reasonably available, considering technological and economic feasibility. RACT is usually applied to existing sources in nonattainment areas and in most cases is less stringent than new source performance standards. RACT reflects controls US Environmental Protection Agency has identified in Control Technology Guidelines (CTGs) or other guidance.