Measurements, abbreviations, and acronyms used in this subpart are defined as follows:

BART—best available retrofit technologyBtu—British thermal unitCO2—carbon dioxideCSAPR—Cross-State Air Pollution RuleH2O—waterhr—hourlb—poundmmBtu—million BtuMWe—megawatt electricalNOX—nitrogen oxidesO2—oxygenppm—parts per millionscfh—standard cubic feet per hourSIP—State implementation planSO2—sulfur dioxide