The objective of this work is to assess through the 'avoided health cost' method what would be the local economic benefits of undertaking greenhouse gases mitigation policies and other more local air pollution policy measures. To do so, we have developed five steps: Base and Mitigation Scenarios (which include mitigation measures to undertake), Emissions Inventory according to the scenarios, an Ambient Air Pollution Model (to calculate the local air quality impacts for each scenario), Health Effects Estimation (to assess the health consequences of reducing air pollution among scenarios) and Economic Valuation of those health impacts. Figure 1.1 illustrates the major analytic components and the inputs and outputs of our work. The geographic scope of the project is restricted to the Buenos Aires Metropolitan Area (BAMA). This is so since BAMA is the most polluted area from the point of view of its contribution to global warming and local contamination, and it is one of the areas where there are more estimates of the possible mitigation options with high probability of implementation.