U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 53Subpart C - Subpart C—Procedures for Determining Comparability Between Candidate Methods and Reference Methods
§ 53.30 - General provisions.
§ 53.31 - [Reserved]
§ 53.32 - Test procedures for methods for SO2, CO, O3, and NO2.
§ 53.33 - Test Procedure for Methods for Lead (Pb).
§ 53.34 - Test procedure for methods for PM10 and Class I methods for PM 2.5.
§ 53.35 - Test procedure for Class II and Class III methods for PM 2.5 and PM −2.5.
Appendix - Table C-1 to Subpart C of Part 53—Test Concentration Ranges, Number of Measurements Required, and Maximum Discrepancy Specifications
Appendix - Table C-2 to Subpart C of Part 53—Sequence of Test Measurements
Appendix - Table C-3 to Subpart C of Part 53—Test Specifications for Pb in TSP and Pb in PM 10 Methods
Appendix - Table C-4 to Subpart C of Part 53—Test Specifications for PM 10, PM 2.5 and PM 10-2.5 Candidate Equivalent Methods
Appendix - Table C-5 to Subpart C of Part 53—Summary of Comparability Field Testing Campaign Site and Seasonal Requirements for Class II and III FEMs for PM 10-2.5 and PM 2.5
Appendix - Figure C-1 to Subpart C of Part 53—Suggested Format for Reporting Test Results for Methods for SO 2, CO, O 3, NO 2
Appendix - Figure C-2 to Subpart C of Part 53—Illustration of the Slope and Intercept Limits for Class II and Class III PM 2.5 Candidate Equivalent Methods
Appendix - Figure C-3 to Subpart C of Part 53—Illustration of the Slope and Intercept Limits for Class II and Class III PM 10-2.5 Candidate Equivalent Methods
Appendix - Figure C-4 to Subpart C of Part 53—Illustration of the Minimum Limits for Correlation Coefficient for PM 2.5 and PM 10-2.5 Class II and III Methods
Appendix Appendix A - Appendix A to Subpart C of Part 53—References
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