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CSAPR

The Cross-State Air Pollution Rule (CSAPR) is a U.S. Environmental Protection Agency (EPA) initiative aimed at reducing air pollution that crosses state lines and impacts air quality in downwind areas.

The rule targets emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) from power plants, with specific focus on the Group 2 and Expanded Group 2 Ozone NOx programs which address pollutants contributing to ground-level ozone in the eastern U.S. CSAPR establishes state-specific emission-reduction targets and allows for the trading of allowances. June 1 is the annual compliance due date. Facility account balances must show allowances equal to or greater than their actual emissions for the program control period or they will be out of compliance and face EPA penalties.

Ozone NOx Group One – G1 is a single state, Georgia.

In 2024, there were 32 facilities who can only trade allowances with other Georgia power plants. These facilities emitted 5,208 tons of NOx during the 2024 ozone season (May 1 – Sep 30).

Ozone NOx Group Two – G2 comprises 10 states in the central US.

In 2024, 339 facilities emitted 104,338 tons of NOx during ozone season (May 1 – Sep 30).

Ozone NOx G2 states: Alabama, Arkansas, Iowa, Kansas, Mississippi, Missouri, Oklahoma, Tennessee, Texas, and Wisconsin

Ozone NOx Group Two Expanded – G2E is a 12-state jurisdiction including Louisiana

and most of the northeastern corner of the US. In 2024, 396 facilities emitted 84,434 tons of NOx during ozone season (May 1 – Sep 30).

Ozone NOx G2E states: Illinois, Indiana, Kentucky, Louisiana, Maryland, Michigan, New Jersey, New York, Ohio, Pennsylvania, Virginia, and West Virginia.

Annual NOx – unlike the ozone-season program, the annual NOx program

requires facilities to retire allowances equal to their full-calendar-year emissions.  In 2024, 629 facilities emitted 15,422 tons of NOx (Jan 1 – Dec 31).  The jurisdiction includes 22 states.

Annual NOx states:  Alabama, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia, and Wisconsin

Annual SO2 Group 1 – made up of 16 states, SO2 G1 is similar to the annual NOx program

but instead regulates sulfur dioxide emissions.  In 2024, 488 facilities emitted 315,809 tons of SO2 (Jan 1 – Dec 31). 

Annual SO2 G1 states:  Illinois, Indiana, Iowa, Kentucky, Maryland, Michigan, Missouri, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, and Wisconsin

Annual SO2 Group 2 – SO2 G2 is just 6 states. Facilities in these states

may only trade SO2 allowances with other facilities in SO2 Group 2 states. In 2024, 141 facilities emitted 64,228 tons of SO2 (Jan 1 – Dec 31). 

Annual SO2 G2 states:  Alabama, Georgia, Kansas, Minnesota, Nebraska, and South Carolina