Regional Smoking Vehicle Program

The Regional Smoking Vehicle Program is designed to inform vehicle owners their vehicle may be creating excessive smoke and emitting pollutants, which are harmful to our health and environment.

Help improve air quality by reporting smoking vehicles. Eligible owners may receive a mailed notice explaining the report, Texas law, and air quality resources.

Where this program covers

Collin, Dallas, Denton, Ellis, Erath, Hood, Hunt, Johnson, Kaufman, Navarro, Palo Pinto, Parker, Rockwall, Somervell, Tarrant, and Wise counties.

Ready to Report?

It only takes a few minutes. You'll need the vehicle's license plate and the location where you observed the smoke.

Did you receive a letter? Complete the survey

Learn More

Driving a vehicle with excessive smoke in Texas is a violation of the state's Smoking Vehicle Statute (opens in a new tab). This statute defines a smoking vehicle as one that either emits smoke for ten or more consecutive seconds, or whose suspended smoke does not fully dissipate within ten seconds. Texas law enforcement agencies may issue citations, punishable by fines up to $1,000, to drivers operating a smoking vehicle on any roadway. Accordingly, the North Central Texas Council of Governments (NCTCOG) informs registered owners of vehicles suspected of emitting excessive smoke.

The registered owner will receive the following by mail:

  • Letter explaining when, where, and description of the vehicle reported anonymously to NCTCOG for emitting excessive visible emissions (smoke)
  • Information highlighting the various possible causes of vehicle smoke

Foundation for Support

House Bill 2134 passed by the 77th Texas Legislature; House Bill 1611 passed by the 79th Texas Legislature; Transportation Code, Title 6, 547.605 (opens in a new tab); the Texas Commission on Environmental Quality (TCEQ) (opens in a new tab); the North Central Texas Council of Governments; and participating counties.

Gather this information:

  1. License plate number
  2. City
  3. Cross streets
  4. Date and time

Then report online or by phone at 817-704-2522.

Common Causes of Vehicle Smoke

Gasoline Engines
Gasoline engine smoke color, diagnosis, and probable causes
Color of Smoke Diagnosis Probable Causes
White Coolant or water leaking into combustion chamber
  • Bad head gasket
  • Cracked block or cylinder head
Blue Engine oil being burned
  • Oil leaking in combustion chamber
  • Worn piston rings, valves, or cylinders
  • Bad exhaust manifold
  • Bad head gasket
Black or Gray Incomplete fuel combustion
  • Clogged air filter
  • Carburetor, choke, fuel injection, or emission system malfunction
  • Ignition timing off
  • Low compression due to engine wear
Diesel Engines
Diesel engine smoke color, diagnosis, and probable causes
Color of Smoke Diagnosis Probable Causes
White Incomplete air/fuel mixture
  • Faulty fuel injection system
  • Incorrect fuel injection and valve timing
  • Engine overheating
  • Faulty fuel pump and/or injection pump
Blue Engine oil being burned
  • Excess engine oil
  • Worn piston rings, valves, or cylinders
Black or Gray Incomplete fuel combustion
  • Damaged air filter
  • Faulty fuel injection system
  • Clogged air filter
  • Wrong grade of fuel
  • Incorrect fuel injection pump timing
  • Engine overheating
  • Low compression ratio

A note about “Tail-Pipe Smoke:” It is normal for smoke to appear during only the first few seconds after engine start.

Causas Comunes del Humo en los Vehículos

Motores de Gasolina
Motores de gasolina: color del humo, diagnosis y causas probables
Color del Humo Diagnosis Causas Probables
Blanco El refrigerante o agua está penetrando la cámara de combustión
  • Empaque dañado de la cabeza
  • Monobloc fisurado o cabeza del cilindro fisurada
Azul Aceite de motor está siendo quemado
  • Aceite penetrando la cámara de combustión
  • Anillos de los pistones, válvulas o cilindros desgastados
  • Cabezal dañado del escape
  • Empaque dañado de la cabeza
Negro o Gris Combustión incompleta de combustible
  • Filtro de aire tapado
  • Desperfecto en el carburador, embrague, inyectores, o sistema de control de emisiones
  • La marcha está fuera de tiempo
  • Compresión baja debido al desgaste del motor
Motores de Diesel
Motores de diesel: color del humo, diagnosis y causas probables
Color del Humo Diagnosis Causas Probables
Blanco Mezcla inadecuada de aire/combustible
  • Fallas en el sistema de inyectores
  • Sincronización incorrecta entre inyectores y válvula
  • Sobre-calentamiento del motor
  • Fallas en la bomba de combustible de inyección
Azul Aceite de motor está siendo quemado
  • Exceso de aceite en el motor
  • Anillos de los pistones, válvulas o cilindros desgastados
Negro o Gris Combustión incompleta de combustible
  • Filtro de aire dañado
  • Fallas en el sistema de inyectores
  • Filtro de aire tapado
  • Combustible de un grado inadecuado
  • Falla en el tiempo de la bomba de inyección de combustible
  • Sobre-calentamiento del motor
  • Índice bajo de compresión

Una nota sobre “Humo del Tubo de Escape:” Es normal que humo aparezca solamente durante los primeros segundos después de arrancar el vehículo.

How do I report a smoking vehicle?

Anyone who sees a smoking vehicle will need to note the following information: the license plate, date and time, type of vehicle (i.e.: car or truck, etc.), and location.

Can out-of-state vehicles be reported?

RSVP is not designed to accept reports on vehicles that are registered outside of Texas. We do not have the resources or the authority to retrieve data on vehicle owners from other states. However, state law prohibits any person from operating a motor vehicle emitting visible smoke for 10 seconds or longer on Texas roadways. Therefore, law enforcement authorities statewide do have the authority to issue citations to the drivers of out-of-state vehicles if they are observed violating this law.

Do people get a ticket if I report them?

No. If a smoking vehicle is called in, the vehicle owner is sent a letter informing them that their vehicle was reported for smoking. We encourage the owner/operator to have the vehicle checked out by their mechanic and to voluntarily repair it, if necessary.

I have a diesel. Why was I reported?

Many diesels, even when properly maintained, have slight smoke emissions. Proper maintenance of your vehicle will greatly decrease smoke emissions and increase engine efficiency.

I sold my vehicle months ago, but I received the smoking vehicle report. What can I do?

If you do not own the vehicle that was reported, you should notify the Texas Department of Motor Vehicles (TxDMV) or your county tax office to have their records corrected. It is likely that the new owner has not transferred the title to their name. If you have further questions about the vehicle title and registration process, please call the TxDMV at 888-368-4689.

My vehicle doesn't smoke. Why was it reported?

A small percentage of calls received on our RSVP line and our website do report incorrect or transposed license plate numbers and we apologize if yours was one of those. Rest assured, as long as your vehicle’s maintenance is performed and it is running clean, it is highly unlikely that you will ever receive another letter.

I just paid to have an emissions check. Why am I receiving this letter?

Your car could pass an emissions test and still emit excessive smoke. Check with your mechanic to see if repairs are needed.

I think my neighbor is victimizing me. What do I do?

We are sorry if that is the motivation behind the complaint lodged against your vehicle. This notification does not affect your driving record and does not carry any penalties.

Are smoking vehicles really any worse than other vehicles?

Yes! Statistics indicate that 10% of the vehicles create more than 50% of the emissions.

Can I report any type of vehicle or equipment I see smoking?

No. This program is designed for “On Road Vehicles.” Here are examples of what you can report to this program:

  • Cars, Mini-Vans, Pickup Trucks, SUV’s, Passenger or Delivery Vans and Trucks, Diesel Cars and Pickup Trucks, Heavy Duty Diesel Trucks and Busses.
  • If state law permits the vehicle to be driven on the road it must comply with the transportation code.

What are the major sources of pollution?

Sources of air pollution can be classified as stationary, area, or mobile sources.

  • Stationary sources include relatively large, fixed facilities such as power plants, chemical process industries, petroleum refineries and cement kilns.
  • Area sources are small, stationary, nontransportation sources that collectively contribute to air pollution, and include such sources as dry cleaners and bakeries, surface coating operations, home furnaces, and crop burning.
  • Mobile sources include on-road vehicles such as cars, trucks, and buses; and off-road sources such as trains, ships, airplanes, boats, lawnmowers, and construction equipment.

What can I do to improve air quality?

Reduce use of solvents, reduce use of energy, keep vehicles in good repair, use alternative commuting options, select low emission vehicles, reduce unnecessary trips, postpone polluting activities on high ozone days, reduce emissions from off-road sources.

What is air pollution?

Air pollution is the presence of substances, both gases and particles, in the air in amounts that are harmful to the health or comfort of humans or animals, or can cause damage to plants or materials (properties). This is usually the result of industrial processes and/or vehicle activities.

What are the criteria pollutants for air pollution?

There are six (6) criteria pollutants: ozone, carbon monoxide, particulate matter, sulfur dioxide, nitrogen dioxide, and lead.

Where are the other non-attainment areas in Texas?

The non-attainment areas are: Beaumont-Port Arthur, Dallas-Fort Worth, Houston-Galveston.

Are there any regions in Texas that has the EPA designation as attainment, after being classified as non-attainment?

Yes. El Paso recently achieved the EPA designation as attainment for their region, and continue their emission reduction programs for the benefits.

How is Ozone being formed?

Ozone is formed as a consequence of chemical reactions in the atmosphere where the reactants are nitrogen oxides and volatile organic compounds in the presence of sun light.

What are the health effects of Ozone?

Ozone poses health problems for children, the elderly, asthmatics, and even healthy adults.

  • It can cause acute respiratory problems.
  • It can aggravate asthma, emphysema and bronchitis.
  • It can lead to hospital admissions and emergency room visit.
  • It can impair the immune system.

Contacts for Questions

Brochure (English and Spanish PDF) (opens in a new tab)

Anthony Moffa

Senior Air Quality Planner

817-695-9281
amoffa@nctcog.org

Jason Brown

Program Manager

817-704-2514
jbrown@nctcog.org

Chris Klaus

Senior Program Manager

817-695-9286
cklaus@nctcog.org

Travis Ripley

Air Quality Planner

(682) 433-0356
TRipley@nctcog.org