Texas Low Emission Diesel (TxLED) Program
Basic Requirements
The TxLED regulations apply to all diesel fuel sold or supplied as fuel for motor vehicles and non-road equipment operating in 110 central and eastern Texas counties.
TxLED must contain less than 10 percent aromatic hydrocarbons by volume and must have a cetane number of 48 or greater, or else must use an approved alternative formulation or comply with the designated alternative limits.
Diesel producers may also use an approved alternative emission-reduction plan to comply with the TxLED regulations.
Diesel fuel producers and importers that produce or import diesel fuel for use in the affected 110 counties are required to register with the TCEQ and submit quarterly reports.
TxLED registration forms and TxLED quarterly reporting forms are supplied by the TCEQ.
- Affected Texas Counties
- Approved Alternative Diesel-Fuel Formulations
- Alternative Emission-Reduction Plans
Registration Requirements and Forms- Quarterly Reporting Requirements and Forms
- Draft Regulatory Guidance Document
Related Rules
Title 30 Texas Administrative Code (30 TAC) 114.6 — Low Emission Fuel Definitions 
30 TAC 114.312–114.319 — Low Emission Diesel
More Questions? Contact the TxLED Program!
For more information, please contact Morris Brown, Air Quality Planning Section, at 512-239-1438 or email aqp@tceq.texas.gov and specify “TxLED Program” in the subject line.
Sign up for e-mail updates on matters relating to the TxLED program.
You will receive e-mails whenever we add new information to this TxLED Stakeholders Web page or to the main TxLED Program Web page. Click on the link below and do the following:
- Enter and confirm your e-mail address.
- From the list of choices, look under Air Quality and select “Texas Low Emission Diesel (TxLED) Program.”
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Featured Items: |
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Texas Low Emission Diesel (TxLED) Stakeholder Group
Information about the TxLED Stakeholder Group, including meeting minutes and a schedule of future meetings.
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EPA Publication: Strategies and Issues in Correlating Diesel Fuel Properties with Emissions (Unified Model)
Publication EPA420-P-01-001 (July 2001) describes the Unified Model.
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Federal Register: EPA approval of parts of the TCEQ March 9, 2005, revision to the TxLED rules
Federal Register notice: U.S. Environmental Protection Agency approval of parts of the TCEQ's March 9, 2005, revision to the TxLED rules.
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Federal Register: EPA approval of TCEQ April 26, 2006, May 9, 2007, and May 23, 2007, revisions to the TxLED rules
Federal Register notice: U.S. Environmental Protection Agency approval of the TCEQ's April 26, 2006, May 9, 2007, and May 23, 2007, revisions to the TxLED rules.
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TCEQ Memorandum: Tank and Material Handling Authorization for Required Diesel Additives
TCEQ Memorandum: Tank and Material Handling Authorization for Required Diesel Additives; relating to additive-based TxLED alternative diesel fuel formulations.
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National Clean Diesel Campaign
A campaign by the U.S. Environmental Protection Agency to reduce diesel emissions by working with manufacturers, fleet operators, air quality professionals, environmental and community organizations, and state and local officials.
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Topics Under This Category: |
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Air Modeling
TCEQ staff use computer models to simulate the meteorological conditions and chemical reactions that contribute to the formation of air pollutants and to predict how air quality in a region will be affected by economic and population growth, and by reducing pollution emissions.
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Air Quality Rule Projects
Rule projects proposed for inclusion in the State Implementation Plan for air quality.
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Approved TxLED Alternative Diesel Fuel Formulations
Diesel fuel blends or additive blends approved by the TCEQ as alternative diesel fuel formulations for Texas Low Emission Diesel (TxLED) may be used by producers to comply with the TxLED regulations.
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Controlling On-Road Mobile Source Vehicle Emissions
Texas has several programs to reduce and control emissions from mobile sources that are driven on roads.
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Draft TxLED Regulatory Guidance Document
Answers to common questions regarding the TCEQ's implementation and enforcement of the Texas Low Emission Diesel (TxLED) rules and requirements.
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Point Source Emissions Inventory
Summary data and other information related to the TCEQ's Point Source Emissions Inventory.
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Texas Emissions Reduction Plan (TERP)
The TERP program provides financial incentives to eligible individuals, businesses or local governments to reduce emissions from polluting vehicles and equipment.
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Texas Low Emission Diesel (TxLED) Stakeholder Group
Information about the TxLED Stakeholder Group, including meeting minutes and a schedule of future meetings.
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TxLED Affected Counties
List of 110 Texas counties in which the Texas Low Emission Diesel (TxLED) regulations apply. Map, rules, contacts.
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TxLED Alternative Emission-Reduction Plans (AERP)
A diesel-fuel producer may use an AERP to demonstrate compliance with the Texas Low Emission Diesel (TxLED) regulations.
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TxLED Producer and Importer Registration
All diesel fuel producers and importers must register with the TCEQ by no later than 45 days after the first date that diesel fuel from their production or import facilities is made available for use in any of the 110 Texas counties affected by the Texas Low Emission Diesel (TxLED) regulations. Download the necessary registration form here.
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TxLED Quarterly Reporting
All diesel producers and importers that have registered with the Texas Low Emission Diesel (TxLED) program are required to submit a TxLED quarterly report to the TCEQ no later than 45 days after the end of each calendar quarter. Download the necessary TxLED quarterly reporting forms here.
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