The scope of this document focuses on the tests required by EPA to validate the performance of the FTIR system following the section in the Code of Federal Regulations Part 1065 (40 CFR 1U.1065 and hereafter referred to as “EPA Part 1065”) on the guidelines and performance criteria for various regulated gases. This document focuses on the use of continuous emissions sampling for both engine and vehicle testing. Future addenda will be needed to cover bag and other sampling techniques.