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States are now required to account for Condensable Particulate Matter (CPM) in establishing emissions limits for particulate matter (PM2.5 and PM10) in all applicable Prevention of Significant Deterioration (PSD) and nonattainment New Source Review (NSR) permits issued. The NSR regulations require that the measurement and control of PM from major stationary sources and major modifications include the condensable component for both PM2.5 and PM10 emissions. Accordingly, CPM must be considered (1) in the Prevention of Significant Deterioration (PSD) program in areas that are classified attainment or unclassifiable for the 1997 annual secondary, 2008 24-hour primary or secondary or 2012 annual primary PM2.5 NAAQS or the PM10 NAAQS, and (2) in nonattainment NSR in areas that are nonattainment for any of the PM2.5 or PM10 NAAQS. Stakeholders have expressed concern that source-specific CPM test results obtained with Method 202 could include positive bias that translates into overestimations of emissions. Some of these stakeholder issues involve the quality of reagent chemicals used in the method, while other issues involve equipment preparation or contamination pre- and post-sampling. Such overestimation could inappropriately affect determinations as to whether major source nonattainment NSR or PSD applies to a new source or modification, required air quality impact analyses and emission offset requirements. The EPA is considering revising sections of Method 202 including, but not limited to, the proof blank train preparation and recovery requirements in the method and use of the proof and field train blanks. The proposed revision would address consistency in the execution of Method 202, which has shown wide variation in its implementation, and allow many performance-based options and procedures.