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Guidance and Fact Sheets

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The links on this page provide guidance on permitting, emissions monitoring, reporting, and other activities under the Acid Rain Program.

Annual Reconciliation

Affected units are allocated “allowances” based on their historic fuel consumption and a specific emissions rate. Annual reconciliation is the process by which EPA compares a regulated unit's annual emissions and the number of allowances it owns.

For more information on how annual reconciliation works under the Acid Rain Program, see the Acid Rain Program Annual Reconciliation Fact Sheet.

Applicability Determinations

An applicability determination is a formal EPA response to questions about how regulations apply to a particular situation.

To view applicability determinations related to the Acid Rain Program regulations, visit Acid Rain Program Applicability Determinations.

Emissions Monitoring

40 CFR Part 75 of the Acid Rain Program regulations requires affected sources to perform continuous emissions monitoring for sulfur dioxide (SO2), nitrogen oxides (NOx), and other related pollutants in order to track progress, ensure compliance, and provide credibility to the trading component of the Acid Rain Program.

For more information, see:

Emissions Reporting

Regulated sources must report all emissions as measured by continuous emissions monitors. EPA has established standard reporting procedures and has issued standard software for such reporting.

For more information, see:


Every emissions source affected by the Acid Rain Program must have a permit. Each acid rain permit specifies the Title IV requirements that apply to each affected unit at the affected source.

For more information, see Acid Rain Permits and Applicability.


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