The Engine Manufacturers Association (EMA) urged the Clean Air Scientific Advisory Committee (CASAC) today to reject and further revise the latest version of the US Environmental Protection Agency's (EPA) Diesel Health Assessment Document (HAD). Although EMA praised the latest version of the HAD as greatly improved from previous versions, the manufacturers indicated that the current document still has serious scientific flaws. "Significant questions remain about the science used in the report to establish the health risks from ambient exposure to diesel exhaust"," said Glenn Keller, EMA Executive Director. "And we are equally concerned about the data used to justify the claim that diesel exhaust is a likely human carcinogen. The characterizations and conclusions regarding the health risks of exposure to diesel exhaust are not supported by current scientific evidence."