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SIP: Glossary and Acronyms

A listing of useful terms and acronyms used frequently in the Texas State Implementation Plan (SIP) for air quality and the Web pages related to it.


attainment demonstration: A plan that describes how a nonattainment area expects to meet the National Ambient Air Quality Standards (NAAQS) by the attainment deadline.

control strategy: Measures to deal with air pollution. Examples of control strategies include an emissions trading program or vehicle inspection and maintenance.

eight-hour ozone standard: The indicator of air quality acceptability as it pertains to ground-level ozone. The current threshold value for this standard is 0.075 ppm, measured as maximum daily eight-hour average concentrations. To attain the eight-hour ozone NAAQS, the three-year average of the annual fourth-highest daily maximum eight-hour ozone concentration must not exceed 0.075 ppm.

nonattainment area: A geographic area that fails to meet a NAAQS. An area must be officially designated by the EPA, under procedures set forth by the Federal Clean Air Act, in order to be classified in nonattainment.

offsets (pollution offsets, industrial growth offset): The reduction of current emissions at a rate equal to or greater than the amount of emissions expected to be produced in a new project. The offset ratio is determined by the ozone air quality classification in a particular area.

one-hour ozone standard: The former indicator of air quality acceptability as it pertains to ground-level ozone. This indicator involves taking an average one-hour concentration of pollutants. An area meets the one-hour ozone NAAQS if the monitored ozone level does not exceed the standard of 0.12 ppm more than three times over a consecutive three-year period.

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ACT: Alternative Control Techniques

AFV: alternative-fuel vehicle

APA: Administrative Procedure Act

ASC: area source categories

ASM: acceleration simulation mode

BACM: best available control measures

BACT: best available control technology

BPA: Beaumont-Port Arthur

CAMx: Comprehensive Air Model with Extensions

CARB: California Air Resources Board

CFR: Code of Federal Regulations

CMSA: Consolidated Metropolitan Statistical Area

CNG: compressed natural gas

CO: carbon monoxide

COAST: Coastal Oxidant Assessment for Southeast Texas

CTG: Control Technique Guidelines

DERC: discrete emission reduction credit

DFW: Dallas-Fort Worth

DPS: Texas Department of Public Safety

DV: design value

EGF: electric generating facility

EGR: exhaust gas recirculation

EI: emissions inventory

ELP: El Paso

EPA: United States Environmental Protection Agency

EPN: emission point number

ERC: emission reduction credit

FACA: Federal Advisory Committee Act

FCAA: Federal Clean Air Act

FIP: federal implementation plan

FMVCP: Federal Motor Vehicle Control Program

FR: Federal Register

FTE: full-time equivalent employee

FTP: File Transfer Protocol

g/hp-hr: grams per horsepower-hour

GIS: geographic information system

g/mi: grams per mile

GVWR: gross vehicle weight rating

HAP: hazardous air pollutant

HB: House Bill

HC: hydrocarbon

HDD: heavy-duty diesel

HDDV: heavy-duty diesel vehicle

HDV: heavy-duty vehicle

HGB: Houston-Galveston-Brazoria

HOV: high-occupancy vehicle

hp: horsepower

HPMS: Highway Performance Monitoring System

kg/ha: kilograms per hectare

km: kilometer

LDT: light-duty truck

LED: low emission diesel

LEV: low emission vehicle

LNG: liquefied natural gas

LSG: low sulfur gasoline

m: meter

MACT: maximum achievable control technology

MMBtu: million British thermal units

MPA: metropolitan planning area

mph: miles per hour

MY: model year

NAAQS: National Ambient Air Quality Standards

NNSR: nonattainment new source review

NOx: nitrogen oxides

NOy: nitrogen species

NSR: new source review

NWS: National Weather Service

O3: ozone

OAQPS: the EPA's Office of Air Quality Planning and Standards

OBD: on-board diagnostics

OSAT: Ozone Source Apportionment Technology

OTAQ: the EPA's Office of Transportation and Air Quality

PAMs: photochemical assessment monitoring sites

Pb: lead

PEI: periodic emissions inventory

PM: particulate matter

PM2.5: particulate matter smaller than 2.5 microns

PM10: particulate matter smaller than 10 microns

ppb: parts per billion

ppm: parts per million

ppmv: parts per million by volume

psi: pounds per square inch

psia: pounds per square inch absolute

QA/QC: quality assurance / quality control

RACT: reasonably available control technology

REMI: Regional Economic Modeling, Inc.

ROP: rate of progress

rpm: revolutions per minute

RVP: Reid vapor pressure

SAE: Society of Automotive Engineers

SB: Senate Bill

SCC: source classification code

SIC: Standard Industrial Classification

SIP: state implementation plan

SO2: sulfur dioxide

SOx: sulfur compounds

SOCMI: Synthetic Organic Chemical Manufacturing Industry

SULEV: super ultra low emission vehicle

TAC: Texas Administrative Code

TCAA: Texas Clean Air Act

TCEQ: Texas Commission on Environmental Quality

TCM: transportation control measure

TERP: Texas Emissions Reduction Plan

TIP: transportation implementation plan

TMCP: Texas Motorist's Choice Program

TNRCC: Texas Natural Resource Conservation Commission (the former name for the TCEQ)

tpd: tons per day

tpy: tons per year

TSP: total suspended particulate

TTI: Texas Transportation Institute

TxDOT: Texas Department of Transportation

VID: Vehicle Identification Database

VIN: vehicle identification number

VIR: Vehicle Inspection Report

VMAS: Vehicle Mass Analysis System

VMEP: Voluntary Mobile Source Emissions Reduction Program

VMT: vehicle miles traveled

VOC: volatile organic compounds

VRF: Vehicle Repair Form

WOE: weight of evidence

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