Clean Diesel Technologies, Inc. engages in the development, design, marketing, and license of technologies and solutions that reduce harmful emissions from internal combustion engines, as well as enhances fuel economy and engine power. Its products include Platinum Plus, a fuel-borne catalyst; the Purifier System, which combines its fuel-borne catalyst with a diesel oxidation catalyst; the fuel-borne catalyst/catalyzed wire mesh filter system; the ARIS nitrogen oxides reduction system; and Biodiesel Plus. The company also offers a range of engineering and development consulting services. It offers its products primarily to distributors, resellers, and vehicle fleets in various industries, including beverage, grocery, shipping, fuel delivery, and marine. Clean Diesel Technologies has operations primarily in the United States, Europe, and Asia. The company was founded in 1994 and is based in Stamford, Connecticut.