Section 52.1073 - Approval status(a) With the exceptions set forth in this subpart, the Administrator approves Maryland's plans for the attainment and maintenance of the national standards.38 FR 33716, Dec. 6, 1973, as amended at 45 FR 53475, Aug. 12, 1980; 47 FR 20128, May 11, 1982; 56 FR 23808, May 24, 1991; 58 FR 50848, Sept. 29, 1993; 61 FR 16061, Apr. 11, 1996; 63 FR 47179, Sept. 4, 1998; 70 FR 25718 , 25724, May 13, 2005; 70 FR 69443 , Nov. 16, 2005; 74 FR 24705 , May 26, 2009; 75 FR 82556 , Dec. 30, 2010; 77 FR 52605 , Aug. 30, 2012; 78 FR 33984 , June 6, 2013