; and (B) the Secretary determines is likely to contribute to the attainment or maintenance of a national ambient air quality standard. ; (2) in subsection (c), by adding at the end the following: (4) Locks and dams; marine highways For each fiscal year, a State may not obligate more than 10 percent of the funds apportioned to the State under section 104(b)(4) for projects described in paragraphs (10) and (11) of subsection (b). ; and (3) by striking subsection (m) and inserting the following: (m) Operating assistance (1) In general A State may obligate funds apportioned under section 104(b)(4) in an area of the State that is otherwise eligible for obligations of such funds for operating costs— (A) under chapter 53 of title 49; or (B) on— (i) a system for which CMAQ funding was eligible, made available, obligated, or expended in fiscal year 2012; or (ii) a State-supported Amtrak route with a valid cost-sharing agreement under section 209 of the Passenger Rail Investment and Improvement Act of 2008 ( 49 U.S.C. 24101 note; Public Law 110–432 ) and no current nonattainment areas under subsection (d). (2) No time limitation Operating assistance provided under paragraph (1) shall have no imposed time limitation if the operating assistance is for— (A) a route described in subparagraph (B)(ii) of that paragraph; or (B) a transit system that is located in— (i) a non-urbanized area