1. a) The phenol disulfonic acid procedures, 40 CFR 60, Appendix A-4, Method 7, as incorporated by reference in Section 217.104;
2. b) Continuous emissions monitoring pursuant to 40 CFR 75, as incorporated by reference in Section 217.104;
3. c) Determination of Nitrogen Oxides Emissions from Stationary Sources (Instrumental Analyzer Procedure), 40 CFR 60, Appendix A-4, Method 7E, as incorporated by reference in Section 217.104;
4. d) Monitoring with portable monitors pursuant to ASTM D6522-20, as incorporated by reference in Section 217.104; and
5. e) How do I conduct the initial and subsequent performance tests (for turbines), regarding NO_x pursuant to 40 CFR 60.4400, as incorporated by reference in Section 217.104.

Measurement of nitrogen oxides must be according to:

(Source: Amended at 49 Ill. Reg. 6355, effective April 23, 2025)