EPA has begun to apply the control chart methodology described in this paper to electronically identify the potential development of sampling system in-leakage (or other monitoring system problems) that result in the under-measurement of emissions data. This paper describes the steps that the Agency intends to use to evaluate CO₂ data for indications of data problems. Return to Emissions Monitoring and Reporting for more emissions monitoring resources.

• Control Chart Methodology for Detecting Under-reported Emissions (PDF)(7 pp, 400 K, December 2016)