Progress Report

Emission Reductions

The Acid Rain Program (ARP) and Cross-State Air Pollution Rule (CSAPR) programs¹ significantly reduced sulfur dioxide (SO₂), annual nitrogen oxides (NOₓ), and ozone season NOₓ emissions from power plants. The Mercury and Air Toxics Standards (MATS) set limits on the emissions of hazardous air pollutants from coal- and oil-burning power plants and have led to reductions in those emissions since 2010. This section covers changes in emissions at power plants affected by CSAPR, ARP, and MATS between 2021 and previous years.

1. CSAPR refers to the CSAPR, the CSAPR Update, and the Revised CSAPR Update programs.