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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 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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