Air Quality Standards: The Role of the Health Effects Institute in Conducting Research

In response to a congressional request, GAO provided information on the Health Effects Institute's (HEI) scientific research on the effects of motor vehicle emissions on human health, specifically: (1) the adequacy of HEI organizational structure and internal controls; (2) the quality, credibility, and relevance of its research; (3) HEI success in reducing adversarial disputes over technical issues and scientific data; and (4) the cost-effectiveness of its research activities.