The DFW Fire Training Research Center trains fire fighters locally, nationally and internationally in the specialty of airport / aircraft fire fighting. We use many different aircraft-designed mock-ups, and purposely ignite the mock-ups to train these fire fighters. During training periods you will see black smoke as a result of these training fires. The rising smoke that you see quickly dissipates into the atmosphere which is a way to know the smoke you see is from the training fires. The DFW FTRC uses clean burning propane and a liquid fuel called E-III – both are environmentally friendly. The Texas Commission on Environmental Quality (TCEQ) continually monitors the training fires to ensure state and federal guidelines are followed.