The Environmental Protection Agency (EPA) is finalizing revisions to Procedure 2 that were proposed in the Federal Register on November 21, 2016. Procedure 2 includes quality assurance/quality control (QA/QC) procedures for particulate matter (PM) continuous emission monitoring systems (CEMS) used for compliance determination at stationary sources. The QA procedures specify the minimum requirements necessary for the control and assessment of the quality of PM CEMS data submitted to the EPA and other regulatory authorities. This action establishes consistent requirements for ensuring and assessing the quality of PM data measured by CEMS that meet initial acceptance requirements in Performance Specification (PS) 11 of appendix B to part 60.