InMAP is a multi-scale emissions-to-health impact model for fine particulate matter (PM<sub>2.5</sub>) that mechanistically evaluates air quality and health benefits of perturbations to baseline emissions. A main simplification of InMAP compared to a comprehensive chemical transport model is that it does so on an annual-average basis rather than the highly time-resolved performance of a full CTM. The model incorporates annual-average parameters (e.g. transport, deposition, and reaction rates) from the a chemical transport model. Grid-cell size varies as shown in Figure 1, ranging from smaller grid cells in urban areas to larger grid cells in rural areas. This variable resolution grid is used to simulate population exposures to PM<sub>2.5</sub> with high spatial resolution while minimizing computational expense.
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