Estimate ambient concentrations, human exposures and health risks that may result from air pollution emissions from complex industrial facilities. Note: This HEM4 github repository contains the source code for HEM4.0. The source code for HEM4.1 and HEM4.2 are available at https://github.com/USEPA/HEM5 by clicking on v4.1 and v4.2 under Tags. - View it on GitHub