ARP

Acid Rain Program. Regulatory Program developed in the 1990s to regulate and reduce air emissions from power plants which eventually form acid rain. The two main pollutants of concern are Sulfur dioxide (SO2 →Sulfuric Acid) and nitrogen oxides (NOx→ Nitric Acid).

BAF

A Bias Adjustment Factor (BAF) is determined in a RATA (Relative Accuracy Test Audit).

CAMD

The Clean Air Markets Division (CAMD) is part of the U.S. EPA that runs regulatory programs for air pollution from power plants.

CEMS

Continuous Emissions Monitoring Systems (CEMS) are used to monitor and analyze gases and pollutants.

CGA

A Cylinder Gas Audit (CGA) tests the CEMS with a concentration of gas at two different points once a quarter.

COMS

A Continuous Opacity Monitoring System (COMS) measures and analyzes the opacity of gases in a smokestack.

CSAPR

The Cross-State Air Pollution Rule (CSAPR) mostly affects states east of the Mississippi River.

DAHS

A data acquisition and handling system (DAHS or DAS) handles the data recording and procession part of a CEMS.

DAS

Data acquisition systems (DAS) handle the data processing and recording part of CEMS systems.

DR

The Designated Representative (DR) is a person chosen by the owners and operator of a plant to act on their behalf to provide required submissions to the EPA.

DT

Downtime (DT) refers to the period of time when valid data is not being recorded.