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Clean Air Markets

Progress Report

Program Basics

The Acid Rain Program (ARP) and the Cross-State Air Pollution Rule (CSAPR) are cap and trade programs designed to reduce emissions of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) from power plants. The ARP covers power plants across the contiguous United States and CSAPR covers power plants in certain eastern states. The EPA is no longer implementing the NOₓ Budget Trading Program (NBP) or the Clean Air Interstate Rule (CAIR).

Program Basics Figures

Program History
History of ARP, NBP, CAIR and CSAPR
Program Map:
CSAPR States
Map of Cross-State Air Pollution Rule States

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