part_subject: "CONTROL OF EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS"
subpart_code: "C"
subpart_subject: "Certification Averaging, Banking, and Trading Provisions"
section_number: "90.204"
section_subject: "Averaging."
cfr_reference: "40 CFR 90.204"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Parts 87 to 95"
revised_date: "Revised as of July 1, 2017"
publication_date: "As of July 1, 2017"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
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(a)Negative credits from engine families with FELs above the applicable emission standard must be offset by positive credits from engine families having FELs below the applicable emission standard, as allowed under the provisions of this subpart. Averaging of credits in this manner is used to determine compliance under § 90.207(b). A manufacturer may have a negative balance of credits as allowed under § 90.207(c)(2).
(b)Cross-class averaging of credits is allowed across all classes of nonroad spark-ignition engines at or below 19 kW.
(c)Credits used in averaging for a given model year may be obtained from credits generated in the same model year by another engine family, credits banked in previous model years, or credits of the same or previous model year obtained through trading subject to the provisions of § 90.205(a). Credits generated under the previously available “Optional transition year averaging, banking, and trading program for Phase 2 handheld engines” of §§ 90.212 through 90.220, since repealed, may also be used in averaging. The restrictions of this paragraph notwithstanding, credits from a given model year may be used to address credit needs of previous model year engines as allowed under § 90.207(c).
(d)The use of credits generated under the early banking provisions of § 90.205(b) is subject to regulations under this subpart.