Utilities, coal producers and other businesses have poured $6.5 million into a lobbying organization whose goal is to stifle congressional legislation that would reduce acid rain, a public interest group said Saturday.

Citizens for Sensible Control of Acid Rain has received its contributions exclusively from industry ever since its founding in 1983, according to figures compiled by the U.S. Public Interest Research Group. The lobbyists have spent $5.1 million so far, including $500,000 from April to June of this year, the group said.