Abstract: The scavenger for oxides of nitrogen to be used in gasoline solutions is ethyl carbamate also called urethane. This compound is not soluble in 100% gasoline but it is soluble in solutions of 90/10 v/v gasoline/ethanol, 90/10 v/v gasoline/methanol and 90/10 v/v gasoline/mixture of ethanol and methanol. A small percentage of water such as 5% by volume can be present in the alcohol so therefore, 190 proof ethanol can be used. The solutions of ethyl carbamate in the above blends of gasoline and alcohol are clear and stable both at room temperature and at sub-freezing temperatures such as −15° C.