Installation Guide - Read Me First System Requirements: Any modern PC that meets the recommended, not minimum, RAM memory and CPU requirements of the respective Operating System should be adequate enough to run the AERMOD modeling system. Any computer system recently built as a "work station" should have more than enough RAM memory, CPU processing power, and hard drive space to run AERMOD. If your system meets these requirements, please proceed by reading through the Sample Run Instructions. This document will provide steps to download and set up the AERMOD modeling system and guide the user through their first sample run. After working through the Sample Run Instructions, the user can choose if they would like to download and use AERPLOT, a post-processor to AERMOD that is used to visualize AERMOD output in Google Earth. If you need help, please contact us through the "Contact Us" link on our SCRAM Web Site or through the link: https://www.epa.gov/scram/forms/contact-us-about-air-quality-models.