A study is under way to determine the relationships between incinerator design criteria and resulting atmospheric contaminant discharges. Tests are made by burning a fuel of constant composition in a prototype multiple chamber incinerator under controlled conditions. Effects of variables are measured by analyzing the flue gases for solids, hydrocarbons, oxides of nitrogen and carbon monoxide. The series of tests herein reported was made to (1) provide information on the relative importance of such variables as stoking and amount of fuel per charge insofar as they affect the production of atmospheric pollutants, and (2) evaluate the chosen levels of variables such as excess combustion air, underfire and secondary air distribution, and fuel charging rate.