TxLED fuel is basically the same as California Air Resources Board (CARB) diesel fuel, with one additional specification. Like California, Texas requires that low emission diesel (LED) has sulfur content no greater than 500 ppm, and an aromatics content no greater than 10 volume percent. In addition, Texas requires a minimum cetane number of 48. The alternative low aromatics diesel (ALAD) formulations that have been certified by CARB are also acceptable for TxLED. Finally, Texas has protocols whereby alternative formulations that provide equivalent emissions benefits to LED can be certified. TxLED is required to be used in both on-highway vehicles and in non-road agricultural and construction equipment.