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Texas Low Emission Diesel (TxLED) Program

Information relating to the TxLED program, approved alternative diesel fuel formulations, producer/importer registration forms, quarterly reporting forms, alternative emission reduction plan (AERP) forms, and regulatory guidance. The TxLED Program is implemented to reduce emissions of nitrogen oxides from diesel-powered motor vehicles and non-road equipment.

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.

Related Rules

Title 30 Texas Administrative Code (30 TAC) 114.6 — Low Emission Fuel Definitions Exit the TCEQ
30 TAC 114.312–114.319 — Low Emission Diesel Exit the TCEQ

More Questions? Contact the TxLED Program!

For more information, please contact Michael Regan, Air Quality Planning Section, at 512-239-2988 or email 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:

  1. Enter and confirm your e-mail address.
  2. From the list of choices, look under Air Quality and select “Texas Low Emission Diesel (TxLED) Program.”
  3. Select other subscriptions if you wish, then click “Save.”
  4. The system will then send you a confirmation e-mail to accept.

You can unsubscribe, change your e-mail address, or choose additional options from the link on this page or from the update e-mails you receive.

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Topics Under this Category

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.
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.
Controlling On-Road Mobile Source Vehicle Emissions
Texas has several programs to reduce and control mobile source emissions from on-road motor vehicles and non-road equipment.
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.
Point Source Emissions Inventory
Summary data and other information related to the TCEQ's Point Source Emissions Inventory.
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.
Texas Low Emission Diesel (TxLED) Stakeholder Group
Information about the TxLED Stakeholder Group, including meeting minutes and a schedule of future meetings.
TxLED Affected Counties
List of 110 Texas counties in which the Texas Low Emission Diesel (TxLED) regulations apply. Map, rules, contacts.
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.
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.
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.