Abstract: A method of controlling NO.sub.x emissions from a combustion chamber wherein non-combustable particulate matter is heat processed. The particulate matter to be heat processed is entrained and dispersed in the products of combustion as a dispersed heat sink in a quantity and particle size to absorb heat by heat transfer from the products of combustion sufficient to cool the products of combustion from their peak temperature at a rate sufficient to kinetically limit the formation of NO in the products of combustion to a level which is a fraction of the NO equilibrium concentration of the products of combustion at their peak temperature. The fuel and oxidizer producing the products of combustion is burned in an equivalence ratio selected to result in substantially not more than small amounts of NO forming gases.