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Reductions in air pollutant emission and ambient concentrations of air pollutants, which would occur in Lima when natural gas (NG) is substituted for existing fuels, were estimated. The analysis suggests that current emission inventories under-predict ambient concentrations. Despite the uncertainty in emissions, the analysis also suggests that significant changes in air pollutant concentrations could be achieved with widespread replacement of diesel and gasoline fuels with NG. [ABSTRACT FROM AUTHOR]