<div class="htmlview paragraph">With the exception of nitric oxide, exhaust emissions from a wide variety of gas turbine engines for both land and air propulsion are at levels below present and projected air pollution standards. It is proposed that emission levels be reported on a basis related to fuel consumption. Experimental data on emission levels of carbon monoxide, hydrocarbons, and oxides of nitrogen are reviewed and compared. Equilibrium and kinetic interpretations of the observed emissions are presented.</div>