Diesel engines are one of the largest contributors to air quality problems worldwide, and will remain so with large expected increases in trucks, vehicle miles traveled, and emissions worldwide. Diesel engines emit hundreds of gas and particle-phase organic compounds, including typical combustion products, such as carbon dioxide (CO2), volatile organic comounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), oxides of sulfur (SOx), oxides of nitrogen (NOx) and many other toxic compounds. Many of
these compounds contribute to smog formation and the particulate matter (PM) emissions impact human health and impair visibility. Diesel exhaust emissions are associated with a variety of human health effects including, cancer, cardiovascular and respiratory health effects, water and soil pollution, and visibility reduction. Dr. Alan Lloyd, Chairman of the ARB, and Tom Cackette, Chief Deputy Executive Officer of the ARB, have written a critical review of diesel engines entitled, "Diesel Engines: Environmental Impact and Control", for the Journal of the Air and Waste Management Association (AWMA). The Journal published the article in June 2001. The Chairman will present the same talk as given at the annual AWMA Conference on June 27, 2001 in Orlando Fl..
Alan C. Lloyd, Ph.D. – has been the Chairman of the California ARB since Feb. 1999. He chaired the Board when it approved diesel risk reduction plan. He currently chairs Board decisions on mobile source and fuels regulations and standards. He served as Executive Director of the Energy and Environmental Engineering Center for the Desert Research Institute at the University and Community College System of Nevada, Reno from 1996 to 1999. From 1988 to 1996 he was the chief scientist of the South Coast Air Quality Management District. During this time he advised the executive officer on scientific and technical research and development findings. He also provided scientific input for market-based policies that balanced environmental protection and economic concerns in the South Coast Air Basin. As an alternative fuels expert, Dr. Lloyd has given presentations to international audiences. He has also authored articles on alternative fuels and air pollution control technology. He has a Bachelor of Science in Chemistry, and a Ph.D. in Gas Kinetics from the University College of Wales, Aberystwyth, U.K.