Founded in 1973, ETS is a firm that provides environmental services, such as control of air emissions, testing, training, troubleshooting and testimony. The company operates a training institute that offers training in control of particulate emissions; air pollution subjects, such as regulation, problem definition, control-device design and selection, operation and maintenance and cost optimization; and control of water and waste pollution. The company offers training through various plant sites and online courses. It also offers bag and fabric testing, bag and baghouse market research, assessments of control technology, and contract research and development services. ETS is headquartered in Roanoke, Va.