40 CFR § 52.1491 - Interstate transport.

---
identifier: "/us/cfr/t40/s52.1491"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.1491 - Interstate transport."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.1491"
section_name: "Interstate transport."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
cfr_part: "52"
---


# 52.1491 Interstate transport.

(a) *Approval.* On February 7, 2007, the Nevada Division of Environmental Protection submitted the “Nevada State Implementation Plan for Interstate Transport to Satisfy the Requirements of the Clean Air Act 110(a)(2)(D)(i) for the 8-hour Ozone and PM<sub>2.5</sub> NAAQS Promulgated in July 1997” (“2007 Interstate Transport SIP”). The 2007 Interstate Transport SIP meets the requirements of Clean Air Act section 110(a)(2)(D)(i) for the 1997 8-hour ozone and 1997 PM<sub>2.5</sub> NAAQS other than the requirements of Clean Air Act section 110(a)(2)(D)(i)(II) regarding interference with other states' measures to protect visibility.

(b) *Approval.* The requirements of Clean Air Act section 110(a)(2)(D)(i)(II) regarding interference with other states' measures to protect visibility for the 1997 8-hour ozone and 1997 PM<sub>2.5</sub> NAAQS are met by the “Nevada Regional Haze State Implementation Plan,” as supplemented and amended on February 18, 2010 and September 20, 2011.

[77 FR 17341, Mar. 26, 2012]