U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 53Subpart E - Subpart E—Procedures for Testing Physical (Design) and Performance Characteristics of Reference Methods and Class I and Class II Equivalent Methods for PM 2.5 or PM 10-2.5
§ 53.50 - General provisions.
§ 53.51 - Demonstration of compliance with design specifications and manufacturing and test requirements.
§ 53.52 - Leak check test.
§ 53.53 - Test for flow rate accuracy, regulation, measurement accuracy, and cut-off.
§ 53.54 - Test for proper sampler operation following power interruptions.
§ 53.55 - Test for effect of variations in power line voltage and ambient temperature.
§ 53.56 - Test for effect of variations in ambient pressure.
§ 53.57 - Test for filter temperature control during sampling and post-sampling periods.
§ 53.58 - Operational field precision and blank test.
§ 53.59 - Aerosol transport test for Class I equivalent method samplers.
Appendix - Table E-1 to Subpart E of Part 53—Summary of Test Requirements for Reference and Class I Equivalent Methods for PM 2.5 and PM 10-2.5
Appendix - Table E-2 to Subpart E of Part 53—Spectral Energy Distribution and Permitted Tolerance for Conducting Radiative Tests
Appendix - Figure E-1 to Subpart E of Part 53—Designation Testing Checklist
Appendix Appendix A - Appendix A to Subpart E of Part 53—References
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