An ideal combustor composed of a fuel-air mixing zone followed by a perfectly stirred reactor (PSR) and a series of plug-flow reactors is studied to determine emission levels of NOxCO, unburned hydrocarbons and soot. It is concluded that these emissions can be reduced to negligible levels provided the stirred reactor is operated at high mass loading rates (Q = ṁ/P2V) and mixing is perfectly controlled. Fuel and air must be premixed before entering the PSR and local φ must be less than 1.2. Perfect stirring in the PSR is necessary. A controlled amount of dilution air is instantaneously added at the PSR exit to quench NO formation but not CO and hydrocarbon oxidation.