SEE HOW CONFUSION is added to end The Clean Power Plan, which is already the subject of a legal challenge by 24 states. On Tuesday, legislators on the House Judiciary Committee will mark up a bill that could subvert the EPA rule H.R 2834 , which relatively straight-forward. It takes the Clean Air Act — a comprehensive environmental protection law thats responsible for reducing pollution from six common pollutants by nearly 70 percent since 1970 — and reorganizes it into its own part of the U.S. code. But the EPA, in a letter from its general counsel in July, says the codification will confuse existing case law, and "further complicates the already complex task of interpreting the Clean Air Act in regulatory proceedings and court cases.”