Progress Report

Emission Reductions

The Acid Rain Program (ARP) and Cross-State Air Pollution Rule (CSAPR) programs significantly reduced sulfur dioxide (SO₂), annual nitrogen oxides (NOₓ), and ozone season NOₓ emissions from power plants. Most of the emission reductions since 2005 occurred in response to the Clean Air Interstate Rule (CAIR), which was replaced by CSAPR in 2015. This section covers changes in emissions at units affected by the CSAPR and ARP in 2016.

Sulfur Dioxide (SO₂) Figures

SO₂ Emission Trends
SO₂ Emissions from CSAPR and ARP Sources, 1980–2016
SO₂ State-by-State
State-by-State SO₂ Emissions from CSAPR and ARP Sources, 1990–2016
SO₂ Emissions and Heat Input
Comparison of SO₂ Emissions and Heat Input for CSAPR and ARP Sources, 2000–2016

Annual Nitrogen Oxides Figures

Annual NOₓ Emission Trends
Annual NOₓ Emissions from CSAPR and ARP Sources, 1990–2016
Annual NOₓ State-by-State
State-by-State Annual NOₓ Emissions from CSAPR and ARP Sources, 1990–2016
Annual NOₓ Emissions and Heat Input
Comparison of Annual NOₓ Emissions and Heat Input for CSAPR and ARP Sources, 2000–2016

Ozone Season Nitrogen Oxides Figures

Ozone Season NOₓ Emission Trends
Ozone Season NOₓ Emissions from CSAPR Sources, 2005–2016
Ozone Season NOₓ State-by-State
State-by-State Ozone Season NOₓ Emissions from CSAPR Sources, 2000–2016
Ozone Season NOₓ Emissions and Heat Input
Comparison of Ozone Season NOₓ Emissions and Heat Input for CSAPR Sources, 2000–2016