New Hampshire's senior Senator, Republican Judd Gregg has introduced what he hopes will be a compromise between two competing clean air bills.
He's co-sponsoring the bill with Delaware Democrat Tom Carper and Rhode Island Republican Lincoln Chafee.
The proposed legislation requires more emissions cuts than the bill backed by the White House.
But it's not as tough as the bill supported by Senate Democrats.
NHPR's Washington Correspondent Judith Smelser has this report.