This report assesses the cost and economic impact of alternative ambient lead standards. The stationary sources covered in the assessment are model primary lead smelters, secondary lead smelters, gasoline lead additive manufacturing plants, lead-acid bettery manufacturing plants, primary copper smelters, and grey iron foundries. In addition, the potential costs of mobile source emission control and of requisite state and local control agency information, administration, and enforcement activities for alternative standards are also estimated. The alternative standards considered are 2.0, 1.5, and 1.0 g/cu m, monthly average. The detailed methodology and documentation of the analysis are provided in the report entitled 'Background Document Supporting the Economic Impact Assessment of the Lead Ambient Air Quality Standard'.