§ 1037.740 Restrictions for using emission credits.
The following restrictions apply for using emission credits:
(a) Averaging sets. Except as specified in paragraph (b) of this section, emission credits may be exchanged only within an averaging set. The following principal averaging sets apply for vehicles certified to the standards of this part involving emission credits as described in this subpart:
(1) Light HDV.
(2) Medium HDV.
(3) Heavy HDV.
(4) Long trailers.
(5) Short trailers.
(6) Note that other separate averaging sets also apply for emission credits not related to this part. For example, vehicles certified to the greenhouse gas standards of 40 CFR 86.1819 comprise a single averaging set. Separate averaging sets also apply for engines under 40 CFR part 1036, including engines used in vehicles subject to this subpart.