Amends section 209 of the Clean Air Act by striking subsection (b); striking the last sentence of subsection (c); redesignating subsections (c) and (d) as (b) and (c), respectively; and striking subsection (e) and inserting a new subsection (d) that prohibits States from adopting or enforcing standards relating to emissions from nonroad engines or nonroad vehicles (including specified new engines used in construction equipment, farm equipment or vehicles, and new locomotives or engines used in locomotives).

Amends section 202(i)(2)(A) of the Clean Air Act by striking text in the matter preceding clause (i) in the first sentence (text to be struck is not specified in this section).

Amends section 211 of the Clean Air Act by making multiple edits: in subsection (c)(4) it strikes specified text in subparagraph (A) (matter preceding clause (i)), strikes subparagraph (B), and redesignates subparagraph (C) as (B); in subsection (k)(1)(B)(ii) it strikes specified text; and in subsection (o)(6) it strikes subparagraph (E), removes specified text from subparagraph (F), and redesignates subparagraph (F) as subparagraph (E).

Amends section 241(2) of the Clean Air Act by striking, in the second sentence, specified text and all that follows through (text endpoint not reproduced in this section).

Amends section 242(b) of the Clean Air Act by striking each place it appears (i.e., removing the referenced text/occurrences as specified).

Amends section 243 of the Clean Air Act by striking subsections (e), (f), and (g).

Repeals section 244 of the Clean Air Act (42 U.S.C. 7584).

Amends section 247(b) by, in the second sentence, striking the text 'section 242, 243, 244,' and inserting 'sections 242, 243,' (removing the reference to section 244).

Repeals Section 177 of the Clean Air Act (42 U.S.C. 7507), removing that provision from federal law.

Amends 42 U.S.C. 7589(e)(3) by striking the second sentence of that subsection.