His research interests are in the use of human and animal models to understand the ability of environmental agents to affect immune responses, particularly agents that modulate allergic and asthmatic responses. His recent work has focused on how diesel exhaust particles exacerbate allergy and asthma, the role of phase II enzymes in conferring susceptibility to pollutants, and the role of oxidative stress in susceptibility to particulate matter and in the potency of particles in promoting airway inflammation. Dr. Díaz-Sánchez is a member of the National Ambient Air Monitoring Strategy Subcommittee of the U.S. Environmental Protection Agency’s Clean Air Science Advisory Committee. He received his PhD from Guy’s Hospital in London.