NPRA: National Petrochemical and Refiners Association

NRC: National Research Council

NSPS: New Source Performance Standards

NSR: New Source Review (The collective name for the Part D NSR and PSD programs.)

O3 ozone

ODS: ozone-depleting substance

OTC: Ozone Transport Commission

PAL: plantwide applicability limitation (A PAL limits emissions from a source or facility as a whole.)

Part D NSR: This is the NSR program that applies to sources seeking permits in areas whose air quality violates the NAAQS.

PCP: pollution-control project

PM: particulate matter

PM2.5: particles less than 2.5 µm in aerodynamic diameter, called fine particles

PM10: particles less than 10 µm in aerodynamic diameter

ppm: parts per million

PSD: prevention of significant deterioration (This is the NSR program that applies to sources seeking permits in areas whose air quality complies with the NAAQS.)

R&D: research and development

RACT: reasonably available control technology

REMSAD: Regulatory Modeling System for Aerosols and Acid Deposition

RIA: regulatory impact analysis

RMRR: routine maintenance, repair, and replacement

R/R/R: retrofitting flue-gas desulfurization (FGD)—selective catalytic reduction (SCR) systems, repowering, or retiring of a coal-fired electricity-generating facility

SCOT: Shell Claus off-gas treating

SCR: selective catalytic reduction

SIC: Standard Industrial Classification

SIP: state implementation plan (Every state must prepare a plan to show how it will attain and maintain the NAAQS.)

SNCR: selective noncatalytic reduction

SO2: sulfur dioxide

STAPPA: State and Territorial Air Pollution Program Administrators

TVA: Tennessee Valley Authority

UAM: Urban Airshed Model

VOC: volatile organic compound

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