; or (II) will achieve further reductions in emissions, such as installing solar panels to power electric school buses purchased with grant funds. (D) Tie In the event that 2 or more eligible entities seeking grants to purchase electric school buses under the program meet the priorities described in subparagraph (A), the Secretary may consider— (i) whether the grant will benefit students in a region that is in nonattainment of a national ambient air quality standard under section 109 of the Clean Air Act ( 42 U.S.C. 7409 ); and (ii) whether the eligible entity, or whether the school system or school that would be served by the eligible entity, has taken other action to reduce emissions during the transportation of students, such as instituting a no-idling policy. (4) Use of school bus fleet Each electric school bus acquired with funds provided under the program— (A) shall be operated as part of the school bus fleet for which the grant was made for not less than 5 years; (B) shall be maintained, operated, and charged according to manufacturer recommendations or State requirements; and (C) may not be manufactured or retrofitted with, or otherwise have installed, a power unit or other technology that creates air pollution within the school bus, such as an unvented diesel passenger heater. (5) Grant awards (A) In general The Secretary may use funds made available to carry out the program— (i) to award grants for— (I) the replacement of existing diesel school bus fleets with electric school buses; (II) the implementation of recharging infrastructure or other infrastructure needed to charge or maintain electric school buses; (III) workforce development and training, to support the maintenance, charging, and operations of electric school buses; and (IV) planning and technical activities to support the adoption and implementation of electric school buses