A dispersion enhancement approach is to allocate clean-burning fuels over a wide geographic region, on a short term basis, so that the clean-burning fuels are burned in the areas with the worst atmospheric dispersion at the moment, and the dirtier-burning fuels which fill out the fuel budget for the region are burned in the areas with the best dispersion at that moment. If this can be done so that each area within the region gets its share of the clean-burning fuels during its periods of worst dispersion, and gives up clean-burning fuels during its periods of best dispersion, one would expect that each region would experience a reduction in both peak and average ambient pollutant concentrations at substantially zero cost. A computer test of this idea, with natural gas as the clean fuel, and with daily allocation of gas with hypothetical cities and meteorology showed this result: all areas showed a reduction in both peak and mean pollutant concentrations. 2 references, 1 table.