---
kind: "section"
citation: "40 C.F.R. § 51.1016"
title: "40"
number: "51.1016"
heading: "Continued applicability of the FIP and SIP requirements pertaining to interstate transport under CAA section 110(a)(2)(D)(i) and (ii) after revocation of the 1997 primary annual PM 2.5 NAAQS."
url: "https://uscodex.org/cfr/40/51.1016"
---

# §51.1016. Continued applicability of the FIP and SIP requirements pertaining to interstate transport under CAA section 110(a)(2)(D)(i) and (ii) after revocation of the 1997 primary annual PM 2.5 NAAQS.


All control requirements associated with a FIP or approved SIP in effect for an area pursuant to obligations arising from CAA section [110(a)(2)(D)(i)](/cfr/40/110.md?p=a-2-D-i) and [(ii)](/cfr/40/110.md?p=a-2-D-ii) as of October 24, 2016, such as the CAIR or the CSAPR, shall continue to apply after revocation of the 1997 primary annual PM2.5 NAAQS. Control requirements associated with a FIP or approved into the SIP pursuant to obligations arising from CAA section [110(a)(2)(D)(i)](/cfr/40/110.md?p=a-2-D-i) and [(ii)](/cfr/40/110.md?p=a-2-D-ii), including 40 CFR [51.123](/cfr/40/51.123.md), [51.124](/cfr/40/51.124.md), [52.35](/cfr/40/52.35.md), [52.36](/cfr/40/52.36.md), [52.38](/cfr/40/52.38.md) and [52.39](/cfr/40/52.39.md), may be modified by the state only if the requirements of § [51.123](/cfr/40/51.123.md), [51.124](/cfr/40/51.124.md), [52.35](/cfr/40/52.35.md), [52.36](/cfr/40/52.36.md), [52.38](/cfr/40/52.38.md) and [52.39](/cfr/40/52.39.md), including statewide annual SO2 and annual NOX emission budgets, continue to be in effect. Any such modification must meet the requirements of CAA [section 110(l)](/cfr/40/110.md?p=l).


## Notes

### Source

Source: 81 FR 58151, Aug. 24, 2016, unless otherwise noted.

### Authority

Authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q.

### Source

Source: 36 FR 22398, Nov. 25, 1971, unless otherwise noted.