(a) Multi-State nonattainment areas. The states comprising a multi-State nonattainment area shall, to the greatest extent possible, promulgate consistent clean-fuel fleet vehicle programs.
(b) Program start date. The SIP revision shall provide that the clean fuel vehicle purchase requirements begin to apply no later than model year 1999. [59 FR 50082, Sept. 30, 1994, as amended at 63 FR 20107, Apr. 23, 1998] Sec. 88.309 [Reserved]