D.C. Mun. Regs. tit. 20, § 1004
1004.1 For purposes of determining the number of days of violation, if a NOₓ Budget unit has excess emissions for a control period, each day in the control period (153 days) constitutes a day in violation unless the owners and operators of the unit demonstrate that a lesser number of days should be considered.
1004.1 Each ton of excess emissions shall be a separate violation.
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).