EMCs could collect information about emissions and stack gas flow with some additional operating parameters. If the EMCs collected additional emission data, quality assurance test results, and operating parameters, they could use the data to assess the quality of the emission data and identify possible problems through electronic data audits. The results of quality assurance tests can be used to diagnose system problems and monitoring compliance; heat input, carbon dioxide (CO2) concentrations, and electricity generation/steam output data can help diagnose leaks in the CEMS sampling system (Boze, 2009; Boze, 2010); operating parameters (e.g., pressure drop, sorbent flow, and pH) for pollution controls can indicate the reasonableness of post-control pollutant concentrations; climate conditions (e.g., temperature and relative humidity) in the CEMS equipment building can identify conditions that may cause gas analyzer calibration to drift. Some EMCs we interviewed are already beginning to collect some of these additional data.