The Air Pollution Control Technology Center (APCT Center) is one of six ETV centers. EPA's partner verification organization, RTI International (RTI), manages the APCT Center. The APCT Center conducts verification testing of potential air pollution control technologies. The APCT Center conducts performance evaluations according to externally reviewed verification Test/Quality Assurance Plans (TQAP), technology specific Test Plan addenda or Statements of Work (SOWs), and established protocols for quality assurance. Emissions testing for air pollution control technologies to be used on mobile sources (on-highway or nonroad vehicles with diesel engines) and some stationary source diesel engines is conducted at Southwest Research Institute (SwRI), an independent, not-for-profit, applied and developmental research organization. Southwest Research Institutes Emission's Research and Development Department (ER&DD) has had significant experience with automotive emissions testing. ER&DD has worked with the EPA to develop automotive emissions sampling and analytical techniques, and to develop test procedures used for regulatory purposes.