Human health and air quality impact factors can be used to endogenize impacts into a human-Earth systems model such as the state-level Global Change Analysis Model (GCAM-USA). The resulting model can then be used to evaluate the monetized health or air quality benefits associated with a technology or policy. Endogenized air pollution impacts can also be constrained, allowing GCAM-USA to identify cost-effective strategies for achieving targeted goals. This package includes R code for developing health impact values ($/ton) and a spreadsheet for translating those factors into damage factors ($/unit activity). Resulting comma-separated-value files that include health damage factors for ozone and particulate matter are also included.