Frequently Used Acronyms and Initialisms
Shortened versions of terms and titles most used by TCEQ staff.
N | O | P | Q | R| S | T | U | V | W | X | Y | Z
Numbers
- 40 CFR 60
- Title 40 Code of Federal Regulations Part 60
A A A A A A A A A A A A A A A A A A A A
- AA
- atomic absorption
- AAS
- atomic absorption spectrometry
- AASHTO
- American Association of State Highway and Transportation Officials
- AC
- Agency Communications or alternating current
- ACFM
- actual cubic feet per minute
- ACGIH
- American Conference of Governmental Industrial Hygienists
- ACIN
- abatement control identification number
- ACT
- alternative control technique
- ADA
- Americans with Disabilities Act
- ADR
- Alternative Dispute Resolution
- ADSO
- additional-duty safety officer
- ADT
- average daily traffic
- AER
- allowable emission rate
- AERCO
- Area Emission Reduction Credit Organization
- AFJ
- agreed final judgment
- AFR
- air-fuel ratio or annual financial report
- AIRPR
- Air Policy and Regulations
- AIRS
- Aerometric Information Retrieval System
- ALAPCO
- Association of Local Air Pollution Control Officials
- ALPM
- actual liters per minute
- AMOC
- alternate methods of control
- AOI
- area of impact
- AOL
- alternate opacity limit
- AOR
- alternate opacity request
- AP-42
- compilation of air pollutant emission factors
- APA
- Administrative Procedures Act
- API
- American Petroleum Institute
- APTRA
- Administrative Procedures and Texas Register Act
- AQ
- Air Quality
- AQAC
- Air Quality Advisory Committee
- AQCR
- air quality control region
- AQMP
- Air Quality Modeling Procedures
- AQP&A
- Air Quality Planning and Assessment
- ARPA
- Agricultural Resources Protection Authority
- As
- arsenic
- ASA
- air stagnation advisory
- ASAE
- American Society of Agricultural Engineers
- ASC
- Administrative Services Coordinator
- ASDWA
- Association of State Drinking Water Administrators
- ASR
- aquifer storage and retrieval
- AST
- aboveground storage tank
- ASTM
- American Society for Testing and Materials
- ASTSWMO
- Association of State and Territorial Solid Waste Management Officials
- ATRV
- air toxics response vehicle
- ATSDR
- Agency for Toxic Substances and Disease Registry
- AVO
- average vehicle occupancy
- AWMA
- Air and Waste Management Association
B B B B B B B B B B B B B B B B B B B B
- BACM
- best available control measures
- BACT
- best available control technology
- BAQC
- Bureau of Air Quality Control (City of Houston program)
- BAR
- Bureau of Automotive Repair
- BART
- Bay Area Rapid Transit (in San Francisco)
- BART
- Best Available Retrofit Technology
- BECC
- Border Environment Cooperation Commission
- BEG
- Bureau of Economic Geology (UT Austin)
- BIF
- boilers and industrial furnaces (EPA's)
- BMPs
- best management practices
- BTEX
- benzene, toluene, ethyl benzene, and xylene
C C C C C C C C C C C C C C C C C C C C
- C
- centigrade
- CAFO
- concentrated animal feeding operation
- CAMS
- continuous air monitoring station
- CAP
- Capacity Assurance Plan or Compliance Advisory Panel (Small Business and Local Government Assistance)
- CAPCO
- Capital Area Council of Governments
- CARB
- California Air Resources Board
- CARE
- clean air responsibility enterprise committee
- CAS
- carbon adsorption system
- CATOX
- catalytic oxidation unit
- CAUSE
- Citizens Allied and United for a Safe Environment
- CBBEP
- Coastal Bend Bays and Estuaries Program
- cc
- Corpus Christi or cubic centimeter
- CCH
- contested case hearing
- CCIP
- Comprehensive Compliance Inspection Protocol
- CCMP
- Comprehensive Conservation and Management Plan
- CCN
- certificate of convenience and necessity
- CDBGP
- Community Development Block Grant Program
- CDC
- Centers for Disease Control
- CDS
- Compliance Data System
- CEIS
- Computerized Emissions Inventory System
- CEMS
- Continuous Emission Monitoring System
- CERCLA
- Comprehensive Environmental Responsibility, Compensation and Liability Act
- CFC
- chlorofluorocarbon
- cfm
- cubic feet per minute
- CFR
- Code of Federal Regulations
- CGA
- cylinder gas audit
- CIN
- control equipment identification number
- CMA
- Chemical Manufacturers Association
- CMSA
- consolidated metropolitan statistical area
- CO
- carbon monoxide
- CO2
- carbon dioxide
- COG
- Council of Government
- COH
- coefficient of haze
- COMM
- Commissioners
- CONTOP
- continuous smelting-top blowing
- CORE
- control operations review and evaluation
- CPI
- consumer price index
- CPP
- continuing planning process
- CRP
- Clean Rivers Program
- CRT
- cathode ray tube
- CRWR
- Center for Research and Water Resources (UT Austin)
- CSGWPP
- Comprehensive State Groundwater Protection Program
- CSI
- Common Sense Initiative
- CSR
- Center for Space Research (UT Austin)
- CTG
- Control Techniques Guidelines
- CWA
- Clean Water Act
- CWS
- commissioners' work session
D D D D D D D D D D D D D D D D D D D D
- DAC
- debutanized aromatic concentrate
- DART
- Dallas Area Rapid Transit
- DERC
- discrete emission reduction credit
- DFW
- Dallas/Fort Worth (Metroplex)
- DIR
- Department of Information Resources
- DO
- dissolved oxygen
- DOC
- Department of Commerce
- DOD
- Department of Defense
- DOE
- Department of Energy
- DOJ
- Department of Justice
- DOPA
- Dairy Outreach Program Area
- DOT
- Department of Transportation
- DPM
- digital panel meter
- DPS
- Department of Public Safety
- DRE
- destruction and removal efficiency
- dscf
- dry standard cubic feet
- dscm
- dry standard cubic meters
- DSS
- decision support system
- DVM
- digital voltmeter
E E E E E E E E E E E E E E E E E E E E
- EA
- environmental assessment
- EC
- electron capture
- ECO
- engineering change order
- ECOS
- Environmental Council of the States
- EDF
- Environmental Defense Fund
- EDRC
- Episode Data Reporting Center
- EEOC
- Equal Employment Opportunity Commission
- EERS
- Earth Electrical Resistivity Survey or excess emission reports
- EGF
- electric generating facility
- EGR
- exhaust gas recirculation
- EI
- emissions inventory
- EIS
- environmental impact statement
- EKMA
- empirical kinetic modeling approach
- EMC
- Emergency Management Center
- EMR
- Environmental Management Report
- EMSL
- Environmental Monitoring Systems Laboratory
- EMTIC
- Emission Measurement Technical Information Center
- ENF
- Enforcement
- EPA
- U. S. Environmental Protection Agency
- EPCCHD
- El Paso City-County Health District
- EPN
- emission point number
- E&QA
- Engineering and Quality Assurance
- ERC
- emission reduction credit
- ERGO
- extended reports and graphic output
- EROS
- Earth Resources Observation System
- ESL
- effects screening level
- ESP
- electrostatic precipitator
- ESR
- Enforcement System Review
- ETBE
- ethyl tertiary-butyl ether
- ETI
- elapsed time indicator
- ETR
- employee trip reduction
- EXEC
- Executive
F F F F F F F F F F F F F F F F F F F F
- FA
- Financial Administration
- FAA
- Federal Aviation Administration
- FC
- fluorocarbons
- FCAA
- Federal Clean Air Act
- FCAAA
- Federal Clean Air Act Amendments
- FCCU
- fluid catalytic cracking unit
- FEC
- formal enforcement conference
- FEMA
- Federal Emergency Management Agency, U.S.
- FGR
- flue gas recirculation
- FHWA
- Federal Highway Administration
- FID
- Flame Ionization Detector
- FIFRA
- Federal Insecticide, Fungicide, and Rodenticide Act
- FIN
- facility identification number
- FIP
- Federal Implementation Plan
- FIPS
- Federal Information Processing Standards
- FIT
- field inspector training
- FLSA
- Fair Labor Standards Act
- FMLER
- Flexible Membrane Liner Evaluation Report
- FMVCP
- Federal Motor Vehicle Control Program
- FO
- Field Operations
- FONSI
- finding of no significant impact
- FR
- Federal Register
- FSR
- financial status report or full-scale range
- FTE
- full-time equivalent
- FY
- fiscal year
G G G G G G G G G G G G G G G G G G G
- GACT
- generally available control technology
- gal
- gallon
- GAQM
- guideline on air quality models
- GBEP
- Galveston Bay Estuary Program
- GBF
- Galveston Bay Foundation
- GC
- gas chromatograph or gas chromatography
- GCCES
- Gulf Coast Community Exposure Study
- GC/ITD
- gas chromatography/ion trap detector
- GC/MS
- gas chromatography/mass spectrometry
- GCPCD
- Galveston County Pollution Control District
- GFI
- ground fault interrupter
- GHP
- Greater-Houston Partnership
- GIS
- Geographic Information System
- GLC
- ground-level concentration
- GLO
- General Land Office
- GLS
- ground-level sampling
- GPS
- Global Positioning System
- GPSA
- Gas Processors Supplier Association
- GPT
- gas-phase titration
- gr/dscf
- grains per dry standard cubic foot
- GRTS
- Grant Reporting and Tracking System
- GWPC
- Groundwater Protection Committee, Texas
H H H H H H H H H H H H H H H H H
- HAN
- heavy aromatic naphtha
- HC
- hydrocarbon
- HCFC
- hydrochlorofluorocarbon
- HCPCD
- Harris County Pollution Control Department
- HEE
- health effects evaluation
- H-GAC
- Houston-Galveston Area Council
- HGACOG
- Houston-Galveston Area Council of Governments
- HHV
- higher heating value
- Hi-Vol
- high-volume air sampler
- HON
- Hazardous Organics NESHAPS
- HOV
- high-occupancy vehicle
- HR
- Human Resources
- HRM
- Houston Regional Marketing Network
- HSWA
- Hazardous and Solid Waste Amendments (to RCRA)
- HUB
- historically underutilized business
- HVLP
- high-volume, low-pressure
- HW
- Hazardous Waste
- HWIR
- hazardous waste identification rules
I I I I I I I I I I I I I I I I I I
- I&HW
- Industrial and Hazardous Waste
- IBEP
- Integrated Border Environmental Plan
- IBWC
- International Boundary and Water Commission
- IC
- Interstate Compacts or ion chromatograph(y)
- ICP
- inductively coupled plasma
- IDLH
- immediate danger to life and health
- IF
- intergovernmental funding
- ILEV
- inherently low-emission vehicle
- I/M
- inspection/maintenance
- INE
- Insituto Nacional de Ecologia
- Intx
- Intersection
- IP
- inhalable particulate
- IR
- Information Resources
- IS
- Information Systems
- ISC
- industrial source complex
- ISCST
- industrial source complex short-term
- ISCLT
- industrial source complex long-term
- ISO
- International Standards Organization
- ITD
- ion trap detector
- ITS
- Inspection Targeting Strategy
K K K K K K K K K K K K K K K K K K K
- kg
- kilogram
L L L L L L L L L L L L L L L L L L L L L
- l
- liter
- LAB
- laboratory
- LAER
- lowest achievable emission rate
- LAR
- Legislative Appropriation Request
- lb
- pound
- LBB
- Legislative Budget Board
- LC
- liquid chromatograph(y)
- LCRA
- Lower Colorado River Authority
- LCTS
- Legislative Contact Tracking System
- LEV
- low-emission vehicle
- LHV
- low heating value
- LNB
- low-nitrogen oxides (NOx) burner
- LOE
- level of effort
- LOR
- liquid organic reactor
- LOV
- letter of violation
- LPST
- leaking petroleum storage tanks
- LTO
- landing and takeoff
- LUST
- leaking underground storage tanks
M M M M M M M M M M M M M M M M M
- MACT
- maximum available control technology
- MAERT
- Maximum Allowable Emission Rate Table
- MBE
- Minority Business Enterprise
- MDERC
- mobile discrete emission reduction credit
- MERC
- mobile emission reduction credit
- MFM
- mass flowmeter
- mL
- millilambert
- ml
- milliliters
- MMBtu
- million British thermal units
- MO
- Monitoring Operations
- MOA
- memorandum of agreement
- MOSES
- Mothers Organized to Stop Environmental Sins
- MOU
- memorandum of understanding
- MPO
- Metropolitan Planning Organization
- MPTER
- multiple-point Gaussian dispersion algorithm with terrain adjustment
- MRAP
- Medical Resources Advisory Panel
- MS
- Mobile Source
- MSA
- metropolitan statistical area
- MSDS
- Material Safety Data Sheet
- MSS
- maintenance, startup, and shutdown
- MSW
- Municipal Solid Waste
- MSWRAC
- Municipal Solid Waste Reduction Advisory Committee
- MS/Z
- multispan/zero box
- MTBE
- methyl tertiary-butyl ether
- MUD
- municipal utility district
- MVVD
- manual vent valve discharge
- MW
- megawatt
N N N N N N N N N N N N N N N N N N N N
- NAA
- nonattainment area
- NAAQS
- National Ambient Air Quality Standards
- NAAS
- National Air Audit System
- NAD Bank
- North American Development Bank
- NADP
- National Atmospheric Deposition Program
- NAFTA
- North American Free Trade Agreement
- NAMS
- national air monitoring station
- NAPAP
- National Acid Precipitation Assessment Program
- NAQTS
- national air quality trend station
- NAR
- nonattainment review
- NARMP
- National Acid Rain Monitoring Program
- NASN
- National Air Surveillance Network
- NCAMS
- noncontinuous air monitoring station
- NCP
- National Contingency Plan or non-criteria pollutant
- NCTCOG
- North Central Texas Council of Governments
- NDIR
- nondispersive infrared analyzer
- NEDS
- National Emissions Data System
- NEPA
- National Environmental Policy Act
- NEPPS
- National Environmental Performance Partnership System
- NESCAUM
- Northeast States for Coordinated Air Use Management
- NESHAPS
- National Emission Standards for Hazardous Air Pollutants
- NGA
- National Governors Association
- NIST
- National Institute of Standards and Technology
- NMOC
- nonmethane organic compound
- NMVOC
- nonmethane VOC
- NOx
- Nitrogen Oxides
- NOAA
- National Oceanic and Atmospheric Administration
- NORM
- naturally occurring radioactive material
- NOV
- Notice of Violation
- NPDES
- National Pollutant Discharge Elimination System
- NPL
- National Priorities List
- NPS
- nonpoint source
- NRCS
- Natural Resource Conservation Service
- NRDA
- natural resource damage assessment
- NSPS
- New Source Performance Standards
- NSF
- National Science Foundation
- NSR
- New Source Review
O O O O O O O O O O O O O O O O O O O
- O3
- Ozone
- OAS
- Office of Administrative Services
- OBD
- on-board diagnostic
- OCE
- Office of Compliance and Enforcement
- OD
- outside diameter
- ODB
- outdoor burning
- OEPAA
- Office of Environmental Policy, Analysis and Assessment
- OLS
- Office of Legal Services
- ONRW
- Outstanding National Resource Waters
- OPASA
- Off-Permit Application Sources and Activities
- OPD
- Operating Permits Division
- OPRR
- Office of Permitting, Remediation and Registration
- OSFR
- Office of State and Federal Relations
- OSHA
- Occupational Safety and Health Administration
- OSSF
- on-site sewage facilities
- OTA
- Office of Technology Assessment
- OWTRC
- On-Site Wastewater Treatment Research Council
P P P P P P P P P P P P P P P P P P P
- P2
- Pollution Prevention
- P4
- Permanent Pollution Prevention Program
- PACE
- People Against a Contaminated Environment
- PAMS
- Photochemical Air Monitoring Stations
- Pb
- lead
- PBR
- permit by rule (formerly “standard exemption”)
- PCB
- polychlorinated biphenyl
- PCV
- positive crankcase ventilation
- PDS
- preliminary determination summary
- PE
- Professional Engineer
- PEL
- priority enforcement level or Priority Enforcement List (tires)
- PFD
- proposal for decision
- PGMA
- priority groundwater management area
- PHHVAS
- pesticide head high-volume air sampler
- PIC
- Public Interest Counsel
- PID
- photoionization detector
- PM
- particulate matter
- PM10
- particulate matter of 10 microns or less
- PMI
- preventive maintenance instructions
- PMR
- pollutant mass rate
- PMSA
- primary metropolitan statistical area
- POHC
- principal organic hazardous constituent
- POTW
- publicly owned treatment works
- ppb
- parts per billion
- ppbv
- parts per billion by volume
- ppm
- parts per million
- ppmv
- parts per million by volume
- ppmvd
- parts per million by volume, dry
- PROFEPA
- PROcuradaria FEderal para la Protecion al Ambiente
- PS
- primary standard
- PSD
- prevention of significant deterioration
- PSDB
- point source database
- PSI
- pollutant standard index
- psia
- pounds per square inch, absolute
- psig
- pounds per square inch, gauge
- PST
- petroleum storage tank
- PSTR
- petroleum storage tank remediation
- PTS
- permeation tube system
- PVC
- polyvinyl chloride
Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q
- QA
- quality assurance
- QC
- quality control or Quality Council
R R R R R R R R R R R R R R R R R R
- R
- Region
- RA
- risk assessment
- RAC
- Research Advisory Council
- RACM
- reasonably available control measures
- RACT
- reasonably available control technology
- RAM
- Gaussian-plume multiple-source air quality algorithm
- RATA
- relative accuracy test audits
- RCRA
- Resource Conservation and Recovery Act
- RCRIS
- Resource Conservation Recovery Act Information System
- RENEW
- Resource Exchange Network for Eliminating Waste
- RFC
- request for comments
- RFP
- reasonable further progress orrequest for proposal
- RHC
- reactive hydrocarbons
- RI/FS
- remedial investigation/feasibility study
- RIM
- rule interpretation memo
- ROG
- reactive organic gas
- ROM
- regional oxidant model
- RP
- responsible party
- RPR
- Responsible Party Remediation
- RPRC
- Rule and Policy Review Committee
- RRC
- Railroad Commission of Texas
- RS
- registered sanitarian
- RSD
- resultant standard deviation
- RTP
- Regional Transportation Plan or Research Triangle Park
- RVCM
- residual vinyl chloride monomer
- RVD
- relief valve discharge
- RVP
- Reid vapor pressure
- RWA
- receiving water assessment
- RWCD
- residential wood combustion devices
S S S S S S S S S S S S S S S S S S S
- SABCUTS
- San Antonio Bexar County Urban Transportation System
- SAMWG
- Standing Air Monitoring Work Group
- SAPEL
- Special Authorization Priority Enforcement List (tires)
- SARA
- Superfund Amendments and Reauthorization Act
- SAROAD
- storage and retrieval of aerometric data
- SAV
- site assessment visit
- SBEA
- Small Business and Environmental Assistance
- SBAdv
- Small Business Advocate
- SCAQMD
- South Coast Air Quality Management District (in California)
- SCC
- source category code or source classification code
- SCCM
- standard cubic centimeters per minute
- SCFM
- standard cubic feet per minute
- SCERP
- Southwest Consortium on Environmental Research and Planning
- SCR
- selective catalytic reduction
- SD
- standard deviation
- SDWA
- Safe Drinking Water Act
- SEM
- scanning electron microscope
- SEMARNAT
- Secretaría de Medio Ambiente y Recursos Naturales (in Mexico)
- SFA
- Stephen F. Austin State Office Building
- SFIREG
- State-FIFRA Issues Research and Evaluation Group
- SIC
- source identification code or Standard Industrial Classification
- SIF
- source investigation form
- SIP
- State Implementation Plan
- SIS
- Source Investigation System
- SLAMS
- state and local air monitoring station
- SLER
- soil liner evaluation report
- SLIAC
- State Legislation Impact Assistance
- SLPM
- standard liters per minute
- SLQCP
- Soil Liner Quality Control Plan
- SMP
- State Management Plan
- SMSA
- standard metropolitan statistical area
- SNCR
- selective noncatalytic reduction
- SOCMI
- Synthetic Organic Chemical Manufacturing Industry
- SO2
- sulfur dioxide
- SP
- standard permit
- SPCC
- spill prevention control and countermeasures
- SPM
- special-purpose monitoring
- SPNSS
- standards of performance for new stationary sources
- SRM
- standard reference material
- SRU
- sulfur recovery unit
- SS
- Support Services
- SSBO
- State Small Business Ombudsman
- SSI
- size-selective inlet
- STAAPA
- State and Territorial Air Pollution Program Administrators
- STEERS
- State of Texas Environmental Electronic Reporting System
- SWDA
- Solid Waste Disposal Act
- SWP
- Source Water Protection Programs
- SWQM
- Surface Water Quality Monitoring
T T T T T T T T T T T T T T T T T T T
- TAB
- Texas Association of Business
- TAC
- Texas Administrative Code
- TAMU
- Texas Agricultural and Mechanical University
- TASN
- Texas Air Sampling Network
- TBA
- tertiary-butyl alcohol
- TBPC
- Texas Building and Procurement Commission
- TBT
- tributyltin
- TC
- total carbon
- TCAA
- Texas Clean Air Act
- TCC
- Texas Chemical Council
- TCLP
- toxicity characteristic leaching procedure
- TCM
- Texas Climatological Model or transportation control measures
- TCEQ
- Texas Commission on Environmental Quality
- TDoC
- Texas Department of Commerce
- TDF
- tire derived fuel
- TDH
- Texas Department of Health
- TEM
- Texas Episodic Model
- TERP
- Texas Emissions Reduction Program
- TEXARC
- Texas Experiment in Augmenting Rainfall through Cloudseeding
- TGWPC
- Texas Groundwater Protection Committee
- THC
- total hydrocarbons
- THM
- trihalomethane
- THROX
- thermal heat recovery oxidation unit
- TIP
- Transportation Improvement Program
- Title III
- Emergency Planning and Community Right-to-Know Act of 1986
- TLAP
- Texas Lab Accreditation Program or Texas Land Application Permits
- TLC
- Texas Legislative Council
- TLV
- health threshold limit value
- TMDL
- total maximum daily load
- TMOGA
- Texas Midcontinent Oil and Gas Association
- TNRIS
- Texas Natural Resources Information System
- TOC
- total organic carbon
- TOP
- Texas Orthoimagery Program (DIR)
- TPHA
- Texas Public Health Association
- TPWD
- Texas Parks and Wildlife
- TQM
- total quality management
- TRACS
- Texas Regulatory Auditing and Compliance System
- TRB
- Transportation Research Board
- TRI
- Toxics Release Inventory
- TRIS
- toxics release information system
- TRRP
- Texas Risk Reduction Program
- TRS
- total reduced sulfur
- TS
- transfer standard
- TSCA
- Toxic Substances Control Act
- TSL
- Texas State Library and Archives
- TSP
- total suspended particulate
- TSS
- total suspended solids
- TSSWCB
- Texas State Soil and Water Conservation Board
- TTC
- Texas Transportation Commission
- TWC
- Texas Water Code
- TWDB
- Texas Water Development Board
- TxDOT
- Texas Department of Transportation
- TxLED
- Texas Low Emission Diesel
- TxREG
- Texas Register
U U U U U U U U U U U U U U U U U
- U/M
- upset and maintenance
- UAM
- urban airshed model
- UCR
- Utility Certification and Rate Design Program
- UIC
- Underground Injection Control
- ULEV
- ultralow emission vehicle
- UMTA
- Urban Mass Transit Administration
- USAS
- Uniform Statewide Accounting System
- USDoT
- U.S. Department of Transportation
- USGS
- U.S. Geological Survey
- USOMB
- U.S. Office of Management and Budget
- USSCS
- U. S. Soil Conservation Service
- UST
- underground storage tank
- UTM
- universal transverse mercator
V V V V V V V V V V V V V V V V V V
- VAC
- volts alternating current
- VCU
- venturi calibration unit
- VDC
- volts direct current
- VIN
- vehicle identification number orvendor identification number
- VMT
- vehicle miles traveled
- VOC
- volatile organic compound
- VR
- vapor recovery
- VRO
- variable-resistance orifice
- VTCS
- Vernon's Texas Civil Statutes
W W W W W W W W W W W W W W
- WBE
- Woman Business Enterprise
- WCID
- Water Control and Improvement District
- WD
- wind direction
- WER
- water-effects ratio
- WET
- Water Education Teams
- WGA
- Western Governors Association
- WHP
- Wellhead Protection Program
- WLE
- waste load evaluation
- WMPs
- Waste Management Plans
- WQMP
- Water Quality Management Plan
- WRAC
- Waste Reduction Advisory Committee
- WRPA
- Waste Reduction Policy Act
- WS
- wind speed
- WU
- Water Utilities
X X X X X X X X X X X X X X X X X X
- XRF
- X-ray fluorescence
Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z
- ZBB
- Zero Base Budget
- ZEV
- Zero Emission Vehicle