StacksVerified U.S. regulatory reference

40 CFR Part 60, Table 6

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
For the following continuous emission monitoring systemsUse the following methods in appendix A of this part to validate poollutant concentratin levelsUse the following methods in appendix A of this part to measure oxygen (or carbon dioxide)
1. Nitrogen Oxides (Class I units only) aMethod 7, 7A, 7B,7C, 7D, or 7EMethod 3 or 3A.
2. Sulfur DioxideMethod 6 or 6CMethod 3 or 3A.
3. Carbon MonoxideMethod 10, 10A, or 10BMethod 3 or 3A.

a Class I units mean small municipal waste combustion units subject to this subpart that are located at municipal waste combustion plants with an aggregate plant combustion capacity greater than 250 tons per day of municipal solid waste. See § 60.1940 for definitions.