H. 999 is the House version of President Bush's Clear Skies Act. The bill would establish
tonnage caps for nitrogen oxides, sulfur dioxide,and mercury. Unlike the Clean Air Planning
Act or the Clean Power Act, the Clear Skies Act would not address carbon dioxide, the major
greenhouse gas implicated in climate change.
The Clear Skies Act makes extensive changes to the Clean Air Act as it applies to the electric
generating sector. The reduction targets and timing proposed by the Clear Skies Act are less
stringent than those proposed by either the Clean Power Act or the Clean Air Planning Act.