WASHINGTON, April 5 — "While working with Environmental Protection Agency officials to write regulations for coal-fired power plants over several recent months, White House staff members played down the toxic effects of mercury, hundreds of pages of documents and e-mail messages show.
The staff members deleted or modified information on mercury that employees of the environmental agency say was drawn largely from a 2000 report by the National Academy of Sciences that Congress had commissioned to settle the scientific debate about the risks of mercury.
In interviews, 6 of 10 members of the academy's panel on mercury said the changes did not introduce inaccuracies. They said that many of the revisions sharpened the scientific points being made and that justification could be made for or against other changes. Most changes were made by the White House's Office of Management and Budget, which employs economists and scientists to review regulations.
But scientists on the academy panel and others outside it as well as environmentalists and politicians expressed concern in recent interviews that a host of subtle changes by White House staff members resulted in proposed rules that played down the health risks associated with mercury from coal-fired power plants. The proposal largely tracks suggestions from the energy industry. While the panel members said the changes did not introduce outright errors, they said they were concerned because the White House almost uniformly minimized the health risks in instances where there could be disagreement."
EDIT
http://www.nytimes.com/2004/04/07/politics/07MERC.html