D.C. Mun. Regs. tit. 20, § 1002
1002.1 The owner or operator of each NOₓ budget source shall comply with the continuous emissions monitoring system (CEMS) provisions of 40 C.F.R. Part 75, subpart H. The emissions monitoring system shall:
(a) Be installed, certified, operated, maintained, and quality assured in a manner approved by the Department and acceptable to the United States Environmental Protection Agency (EPA); and
(b) Demonstrate whether the NOₓ emissions exceed the maximum allowable NOₓ budget or source-specific NOₓ emission limits specified in this chapter.
SOURCE: Final Rulemaking published at 47 DCR 8646 (October 10, 2000); as amended by Final Rulemaking published at 47 DCR 9686 (December 8, 2000); as amended by Final Rulemaking published at 62 DCR 5685 (May 8, 2015).