Compliance Dates for Amendments Being Promulgated on May 13, 2024

Table 4 to Subpart QQQ of Part 63—Compliance Dates for Amendments Being Promulgated on May 13, 2024 If the construction/reconstruction date is . . . Then the owner or operator must comply with . . . And the owner or operator must achieve compliance . . . On or before January 11, 2022 Requirements for existing sources in §§ 63.1444(f)(2) and (3), (l); 63.1446; 63.1449; 1 63.1450(a) and (d); and 63.1451 through 63.1456, as applicable On or before May 13, 2025. Requirements for existing sources in §§ 63.1444(h); 63.1449; 1 63.1450(e); and 63.1451 through 63.1456, as applicable On or before May 13, 2026. After January 11, 2022 Requirements for new sources in §§ 63.1444(e)(1) and (2), (f)(2) and (3), (h), (m); 63.1446; 63.1449; 1 63.1450(a), (d), (e); and 63.1451 through 63.1456, as applicable Upon initial startup or May 13, 2024, whichever is later. On or before July 24, 2023 Requirements for existing sources in §§ 63.1444(g); 63.1449; 1 63.1450(a); and 63.1451 through 63.1456, as applicable On or before May 13, 2027. Requirements for existing sources in §§ 63.1444(o); 63.1449; 1 63.1450(f); and 63.1451 through 63.1456, as applicable On or before May 13, 2025. Requirements for existing sources in §§ 63.1444(q); 63.1449; 1 63.1450(a), (g); and 63.1451 through 63.1456, as applicable On or before November 12, 2024. After July 24, 2023 Requirements for new sources in §§ 63.1444(o), (q); 63.1449; 1 63.1450(a), (f), (g); and 63.1451 through 63.1456, as applicable Upon initial startup or May 13, 2024, whichever is later. On or before May 13, 2024 Requirements for existing sources in §§ 63.1444(p); 63.1449; 1 63.1450(g); and 63.1451 through 63.1456, as applicable On or before May 13, 2027. 1 Section 63.1449(a) provides that any necessary performance test is conducted within 180 days of the compliance date.