Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart AAAAAAA > Appendix - Table 3 to Subpart AAAAAAA of Part 63

Regulations last checked for updates: Feb 22, 2025

Title 40 - Protection of Environment last revised: Nov 22, 2025

Appendix - Table 3 to Subpart AAAAAAA of Part 63—Test Methods

For * * *	You must use * * *
1. Selecting the sampling locations ^a and the number of traverse points	EPA test method 1 or 1A in appendix A to part 60.
2. Determining the velocity and volumetric flow rate	EPA test method 2, 2A, 2C, 2D, 2F, or 2G, as appropriate, in appendix A to part 60.
3. Determining the gas molecular weight used for flow rate determination	EPA test method 3, 3A, 3B, as appropriate, in appendix A to part 60.
4. Measuring the moisture content of the stack gas	EPA test method 4 in appendix A to part 60.
5. Measuring the PM emissions	EPA test method 5A in appendix A to part 60.
6. Measuring the PAH emissions	EPA test method 23.

^a The sampling locations must be located at the outlet of the process equipment (or control device, if applicable), prior to any releases to the atmosphere.

^b When using EPA Method 23, the toluene extraction step specified in section 3.1.2.1 of the method should be omitted.

[74 FR 63260, Dec. 2, 2009, as amended at 88 FR 16773, Mar. 20, 2023]

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.