86.000-28—Compliance with emission standards.
(2)
Each exhaust, evaporative and refueling emission standard (and family particulate emission limits, as appropriate) of § 86.000-8 applies to the emissions of vehicles for the appropriate useful life as defined in §§ 86.000-2 and 86.000-8.
(a)
(4)
(B)(2 )(ii) These interpolated values shall be carried out to a minimum of four places to the right of the decimal point before dividing one by the other to determine the deterioration factor. The results shall be rounded to three places to the right of the decimal point in accordance with the Rounding-Off Method specified in ASTM E29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (incorporated by reference; see § 86.1 ).
(a)
(4)
(A)(1) The official exhaust emission test results for each applicable exhaust emission standard for each emission data vehicle at the selected test point shall be multiplied by the appropriate deterioration factor: Provided, that if a deterioration factor as computed in paragraph (a)(4)(i)(B)(2 )(ii) of this section is less than one, that deterioration factor shall be one for the purposes of this paragraph. For the SFTP composite standard of (NMHC NOX ), the measured results of NMHC and NOX must each be multiplied by their corresponding deterioration factors before the composite (NMHC NOX) standard is calculated.
(2) The calculation specified in paragraph (a)(4)(ii)(A)(1) of this section may be modified with advance approval of the Administrator for engine-system combinations which are certified under the Alternative Service Accumulation Durability Program specified in § 86.094-13(e).
(a)
(4)
The emissions to compare with the standard (or the family particulate emission limit, as appropriate) shall be the adjusted emissions of § 86.098-28 (a)(4)(ii)(B) and (C) and paragraph (a)(4)(ii)(A) of this section 211a for each emission-data vehicle. For the SFTP composite (NMHC NOX) results, the individual deterioration factors must be applied to the applicable NMHC and NOX test results prior to calculating the adjusted composite (NMHC NOX) level that is compared with the standard. The additional composite calculations that are required by the SFTP are discussed in § 86.164-00 (Supplemental federal test procedure calculations). Before any emission value is compared with the standard (or the family particulate emission limit, as appropriate), it shall be rounded to two significant figures in accordance with the Rounding-Off Method specified in ASTM E29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (incorporated by reference; see § 86.1 ). The rounded emission values may not exceed the standard (or the family particulate emission limit, as appropriate).
(b)
(4)
Separate exhaust emission deterioration factors for each regulated exhaust constituent, determined from tests of vehicles, engines, subsystems, or components conducted by the manufacturer, shall be supplied for each standard and for each engine-system combination. Unless the Administrator approves a manufacturer's request to develop specific deterioration factors for US06 and air conditioning (SC03) test results, applicable deterioration factors determined from FTP exhaust emission results will also be used to estimate intermediate and full useful life emissions for all SFTP regulated emission levels.
(iii)
The official exhaust emission results for each applicable exhaust emission standard for each emission data vehicle at the selected test point shall be adjusted by multiplication by the appropriate deterioration factor. However, if the deterioration factor supplied by the manufacturer is less than one, it shall be one for the purposes of this paragraph (b)(4)(iii).
(iv)
The emissions to compare with the standard(s) (or the family particulate emission limit, as appropriate) shall be the adjusted emissions of paragraph (b)(4)(iii) of this section for each emission-data vehicle. For the SFTP composite (NMHC NOX) results, the individual deterioration factors must be applied to the applicable NMHC and NOX test results prior to calculating the adjusted composite (NMHC NOX) level that is compared with the standard. The additional composite calculations that are required by the SFTP are discussed in § 86.164-00 (Supplemental federal test procedure calculations). Before any emission value is compared with the standard, it shall be rounded to two significant figures in accordance with the Rounding-Off Method specified in ASTM E29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (incorporated by reference; see § 86.1 ).
(5)
(i)
Paragraphs (b)(5)(i) (A) and (B) of this section apply only to manufacturers electing to participate in the particulate averaging program.
(A)
If a manufacturer chooses to change the level of any family particulate emission limit(s), compliance with the new limit(s) must be based upon existing certification data.
(B)
The production-weighted average of the family particulate emission limits of all applicable engine families, rounded to two significant figures in accordance with the Rounding-Off Method specified in ASTM E29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (incorporated by reference; see § 86.1 ), must comply with the particulate standards in § 86.099-9 (a)(1)(iv) or (d)(1)(iv), or the composite particulate standard as defined in § 86.094-2, as appropriate, at the end of the product year.
(ii)
Paragraphs (b)(5)(ii) (A) and (B) of this section apply only to manufacturers electing to participate in the NOX averaging program.
(A)
If a manufacturer chooses to change the level of any family NOX emission limit(s), compliance with the new limit(s) must be based upon existing certification data.
(B)
The production-weighted average of the family FTP NOX emission limits of all applicable engine families, rounded to two significant figures in accordance with the Rounding-Off Method specified in ASTM E29-90, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications (incorporated by reference; see § 86.1 ), must comply with the NOX standards of § 86.099-9(a)(1)(iii) (A) or (B), or the composite NOX standard as defined in § 86.094-2, at the end of the product year.