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Clean Air Markets

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 CSAPR and ARP in 2015, and does not include programs not being implemented in 2015 (NBP and Clean Air Interstate Rule [CAIR]).

Sulfur Dioxide (SO₂) Figures

SO₂ Emission Trends
SO₂ Emissions from CSAPR and ARP Sources, 1980–2015
SO₂ State-by-State
State-by-State SO₂ Emissions from CSAPR and ARP Sources, 1990–2015
SO₂ Emissions and Heat Input
Comparison of SO₂ Emissions and Heat Input for CSAPR and ARP Sources, 2000–2015

Annual Nitrogen Oxides (NOₓ) Figures

NOₓ Annual Program Emission Trends
Annual NOₓ Emissions from CSAPR and ARP Sources, 1990–2015
NOₓ Annual Program State-by-State
State-by-State Annual NOₓ Emissions from CSAPR and ARP Sources, 1990–2015
NOₓ Annual Program Emissions and Heat Input
Comparison of Annual NOₓ Emissions and Heat Input for CSAPR and ARP Sources, 2000–2015

Ozone Season Nitrogen Oxides (NOₓ) Figures

NOₓ Ozone Season Emission Trends
Ozone Season NOₓ Emissions from CSAPR Sources, 2005–2015
NOₓ Ozone Season State-by-State
State-by-State Ozone Season NOₓ Emissions from CSAPR Sources, 2000–2015
NOₓ Ozone Season Emissions and Heat Input
Comparison of Ozone Season NOₓ Emissions and Heat Input for CSAPR Sources, 2000–2015

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