Section 86.1818-12 - [Effective 6/17/2024] Greenhouse gas emission standards for light-duty vehicles, light-duty trucks, and medium-duty passenger vehiclesGreenhouse gas emission standards for light-duty vehicles, light-duty trucks, and medium-duty passenger vehicles.
(a)Applicability.(1) The greenhouse gas standards and related requirements in this section apply to 2012 and later model year LDV, LDT, and MDPV, including multi-fuel vehicles, vehicles fueled with alternative fuels, hybrid electric vehicles, plug-in hybrid electric vehicles, electric vehicles, and fuel cell vehicles. Unless otherwise specified, multi-fuel vehicles must comply with all requirements established for each consumed fuel.(2) The standards specified in this section apply for testing at both low-altitude conditions and high-altitude conditions. However, manufacturers must submit an engineering evaluation indicating that common calibration approaches are utilized at high altitude instead of performing testing for certification, consistent with § 86.1829. Any deviation from low altitude emission control practices must be included in the auxiliary emission control device (AECD) descriptions submitted at certification. Any AECD specific to high altitude requires engineering emission data for EPA evaluation to quantify any emission impact and determine the validity of the AECD.(3) A manufacturer that qualifies as a small business according to § 86.1801-12(j) is exempt from the emission standards in this section and the associated provisions in 40 CFR part 600 ; however, manufacturers may trade emission credits generated in a given model year only by certifying to emission standards that apply for that model year. Starting in model year 2027, manufacturers may produce no more than 500 exempt vehicles in any model year under this paragraph (a)(3). This limit applies for vehicles with engines, including plug-in hybrid electric vehicles; this limit does not apply for electric vehicles. Vehicles that are not exempt under this paragraph (a)(3) must meet emission standards as specified in this section.(b)Definitions. The following definitions apply for this section: (1)Passenger automobile means a motor vehicle that is a passenger automobile as that term is defined in 49 CFR 523.4 .(2)Light truck means a motor vehicle that is a non-passenger automobile as that term is defined in 49 CFR 523.5 .(3) Manufacturer has the meaning given by the Department of Transportation at 49 CFR 531.4 .(c)Fleet average CO2standards. Fleet average CO2 standards apply as follows for passenger automobiles and light trucks:(1) Each manufacturer must comply with separate fleet average CO2 standards for passenger automobiles and light trucks. To calculate the fleet average CO2 standards for passenger automobiles for a given model year, multiply each CO2 target value by the production volume of passenger automobiles for the corresponding model type-footprint combination, then sum those products and divide the sum by the total production volume of passenger automobiles in that model year. Repeat this calculation using production volumes of light trucks to determine the separate fleet average CO2 standards for light trucks. Round the resulting fleet average CO2 emission standards to the nearest whole gram per mile. Averaging calculations and other compliance provisions apply as described in § 86.1865.(2) A CO2 target value applies for each unique combination of model type and footprint. The CO2 target serves as the emission standard that applies throughout the useful life for each vehicle. Determine the CO2 target values from the following table for model year 2032 and later, or from paragraph (h) of this section for model year 2031 and earlier: Table 1 to Paragraph (c)(2) -Footprint-Based CO 2
Target Values
| Vehicle type | Footprint cutpoints (ft2 ) | CO 2 target value (g/mile) |
| Low | High | Below low cutpoint | Between cutpoints a | Above high cutpoint |
| Passenger automobile | 45 | 56 | 71.8 | 0.35 * f + 56.2 | 75.6 |
| Light truck | 45 | 70.0 | 75.7 | 1.38 * f + 13.8 | 110.1 |
| a Calculate the CO 2 target value for vehicles between the footprint cutpoints as shown, using vehicle footprint, f, and rounding the result to the nearest 0.1 g/mile. |
(d)In-use CO2exhaust emission standards. The in-use CO2 exhaust emission standard shall be the combined city/highway carbon-related exhaust emission value calculated for the appropriate vehicle carline/subconfiguration according to the provisions of § 600.113-12(g)(4) of this chapter adjusted by the deterioration factor from § 86.1823-08(m) . Multiply the result by 1.1 and round to the nearest whole gram per mile. For in-use vehicle carlines/subconfigurations for which a combined city/highway carbon-related exhaust emission value was not determined under § 600.113-12(g)(4) of this chapter, the in-use CO2 exhaust emission standard shall be the combined city/highway carbon-related exhaust emission value calculated according to the provisions of § 600.208 of this chapter for the vehicle model type (except that total model year production data shall be used instead of sales projections) adjusted by the deterioration factor from § 86.1823-08(m) . Multiply the result by 1.1 and round to the nearest whole gram per mile. For vehicles that are capable of operating on multiple fuels, except plug-in hybrid electric vehicles, a separate in-use standard shall be determined for each fuel that the vehicle is capable of operating on. The standards in this paragraph (d) apply to in-use testing performed by the manufacturer pursuant to regulations at §§ 86.1845 and 86.1846 and to in-use testing performed by EPA.(f)Nitrous oxide (N2 O) and methane (CH4) exhaust emission standards for passenger automobiles and light trucks. Each manufacturer's fleet of combined passenger automobiles and light trucks must comply with N2 O and CH4 standards using either the provisions of paragraph (f)(1), (2), or (3) of this section. Except with prior EPA approval, a manufacturer may not use the provisions of both paragraphs (f)(1) and (2) of this section in a model year. For example, a manufacturer may not use the provisions of paragraph (f)(1) of this section for their passenger automobile fleet and the provisions of paragraph (f)(2) for their light truck fleet in the same model year. The manufacturer may use the provisions of both paragraphs (f)(1) and (3) of this section in a model year. For example, a manufacturer may meet the N2 O standard in paragraph (f)(1)(i) of this section and an alternative CH4 standard determined under paragraph (f)(3) of this section. (1)Standards applicable to each test group.(i) Exhaust emissions of nitrous oxide (N2O) shall not exceed 0.010 grams per mile at full useful life, as measured according to the Federal Test Procedure (FTP) described in subpart B of this part. Manufacturers may optionally determine an alternative N2O standard under paragraph (f)(3) of this section.(ii) Exhaust emissions of methane (CH4) shall not exceed 0.030 grams per mile at full useful life, as measured according to the Federal Test Procedure (FTP) described in subpart B of this part. Manufacturers may optionally determine an alternative CH4 standard under paragraph (f)(3) of this section.(2)Include N2O and CH4in fleet averaging program. Manufacturers may elect to not meet the emission standards in paragraph (f)(1) of this section. Manufacturers making this election shall include N2O and CH4 emissions in the determination of their fleet average carbon-related exhaust emissions, as calculated in 40 CFR part 600, subpart F. Manufacturers using this option must include both N2O and CH4 full useful life values in the fleet average calculations for passenger automobiles and light trucks. Use of this option will account for N2O and CH4 emissions within the carbon-related exhaust emission value determined for each model type according to the provisions of 40 CFR part 600. This option requires the determination of full useful life emission values for both the Federal Test Procedure and the Highway Fuel Economy Test. Manufacturers selecting this option are not required to demonstrate compliance with the standards in paragraph (f)(1) of this section.(3)Optional use of alternative N2O and/or CH4standards. Manufacturers may select an alternative standard applicable to a test group, for either N2O or CH4, or both. For example, a manufacturer may choose to meet the N2O standard in paragraph (f)(1)(i) of this section and an alternative CH4 standard in lieu of the standard in paragraph (f)(1)(ii) of this section. The alternative standard for each pollutant must be greater than the applicable exhaust emission standard specified in paragraph (f)(1) of this section. Alternative N2O and CH4 standards apply to emissions measured according to the Federal Test Procedure (FTP) described in Subpart B of this part for the full useful life, and become the applicable certification and in-use emission standard(s) for the test group. Manufacturers using an alternative standard for N2O and/or CH4 must calculate emission debits according to the provisions of paragraph (f)(4) of this section for each test group/alternative standard combination. Debits must be included in the calculation of total credits or debits generated in a model year as required under § 86.1865-12(k)(5) . For flexible fuel vehicles (or other vehicles certified for multiple fuels) you must meet these alternative standards when tested on any applicable test fuel type.(4)CO2-equivalent debits. CO2-equivalent debits for test groups using an alternative N2O and/or CH4 standard as determined under paragraph (f)(3) of this section shall be calculated according to the following equation and rounded to the nearest whole megagram: Debits = [GWP * (Production) * (AltStd-Std) * VLM] ÷ 1,000,000
Where:
Debits = CO2-equivalent debits for N2O or CH4, in Megagrams, for a test group using an alternative N2O or CH4 standard, rounded to the nearest whole Megagram;
GWP = 25 if calculating CH4 debits and 298 if calculating N2O debits;
Production = The number of vehicles of that test group domestically produced plus those imported as defined in § 600.511 of this chapter;
AltStd = The alternative standard (N2O or CH4) selected by the manufacturer under paragraph (f)(3) of this section;
Std = The exhaust emission standard for N2O or CH4 specified in paragraph (f)(1) of this section; and
VLM = 195,264 for passenger automobiles and 225,865 for light trucks.
(g)Alternative fleet average standards for manufacturers with limited sales. Manufacturers meeting the criteria in this paragraph (g) may request alternative fleet average CO2 standards for model year 2031 and earlier vehicles. (1)Eligibility for alternative standards. Eligibility as determined in this paragraph (g) shall be based on the total nationwide sales of combined passenger automobiles and light trucks. The terms "sales" and "sold" as used in this paragraph (g) shall mean vehicles produced for sale in the states and territories of the United States. For the purpose of determining eligibility the sales of related companies shall be aggregated according to the provisions of § 86.1838-01(b)(3) , or, if a manufacturer has been granted operational independence status under § 86.1838-01(d) , eligibility shall be based on that manufacturer's vehicle sales. To be eligible for alternative standards established under this paragraph (g), the manufacturer's average sales for the three most recent consecutive model years must remain below 5,000. If a manufacturer's average sales for the three most recent consecutive model years exceeds 4999, the manufacturer will no longer be eligible for exemption and must meet applicable emission standards starting with the model year according to the provisions in this paragraph (g)(1). (i) If a manufacturer's average sales for three consecutive model years exceeds 4999, and if the increase in sales is the result of corporate acquisitions, mergers, or purchase by another manufacturer, the manufacturer shall comply with the emission standards described in paragraph (c) of this section, as applicable, beginning with the first model year after the last year of the three consecutive model years.(ii) If a manufacturer's average sales for three consecutive model years exceeds 4999 and is less than 50,000, and if the increase in sales is solely the result of the manufacturer's expansion in vehicle production (not the result of corporate acquisitions, mergers, or purchase by another manufacturer), the manufacturer shall comply with the emission standards described in paragraph (c), of this section, as applicable, beginning with the second model year after the last year of the three consecutive model years.(2)Requirements for new entrants into the U.S. market. New entrants are those manufacturers without a prior record of automobile sales in the United States and without prior certification to greenhouse gas emission standards in this section. In addition to the eligibility requirements stated in paragraph (g)(1) of this section, new entrants must meet the following requirements: (i) In addition to the information required under paragraph (g)(4) of this section, new entrants must provide documentation that shows a clear intent by the company to actually enter the U.S. market in the years for which alternative standards are requested. Demonstrating such intent could include providing documentation that shows the establishment of a U.S. dealer network, documentation of work underway to meet other U.S. requirements (e.g., safety standards), or other information that reasonably establishes intent to the satisfaction of the Administrator.(ii) Sales of vehicles in the U.S. by new entrants must remain below 5,000 vehicles for the first three model years in the U.S. market, and in subsequent years the average sales for any three consecutive years must remain below 5,000 vehicles. Vehicles sold in violation of these limits within the first five model years will be considered not covered by the certificate of conformity and the manufacturer will be subject to penalties on an individual-vehicle basis for sale of vehicles not covered by a certificate. In addition, violation of these limits will result in loss of eligibility for alternative standards until such point as the manufacturer demonstrates two consecutive model years of sales below 5,000 automobiles. After the first five model years, the eligibility provisions in paragraph (g)(1) of this section apply, where violating the sales thresholds is no longer a violation of the condition on the certificate, but is instead grounds for losing eligibility for alternative standards.(iii) A manufacturer with sales in the most recent model year of less than 5,000 automobiles, but where prior model year sales were not less than 5,000 automobiles, is eligible to request alternative standards under this paragraph (g). However, such a manufacturer will be considered a new entrant and subject to the provisions regarding new entrants in this paragraph (g), except that the requirement to demonstrate an intent to enter the U.S. market in paragraph (g)(2)(i) of this section shall not apply.(3) How to request alternative fleet average standards. Eligible manufacturers may petition for alternative standards for up to five consecutive model years if sufficient information is available on which to base such standards. (i) To request alternative standards starting with the 2017 model year, eligible manufacturers must submit a completed application no later than July 30, 2013.(ii) To request alternative standards starting with a model year after 2017, eligible manufacturers must submit a completed request no later than 36 months prior to the start of the first model year to which the alternative standards would apply.(iii) The request must contain all the information required in paragraph (g)(4) of this section, and must be signed by a chief officer of the company. If the Administrator determines that the content of the request is incomplete or insufficient, the manufacturer will be notified and given an additional 30 days to amend the request.(4)Data and information submittal requirements. Eligible manufacturers requesting alternative standards under this paragraph (g) must submit the following information to the Environmental Protection Agency. The Administrator may request additional information as she deems appropriate. The completed request must be sent to the Environmental Protection Agency at the following address: Director, Compliance and Innovative Strategies Division, U.S. Environmental Protection Agency, 2000 Traverwood Drive, Ann Arbor, Michigan 48105. (i)Vehicle model and fleet information.(A) The model years to which the requested alternative standards would apply, limited to five consecutive model years.(B) Vehicle models and projections of sales volumes for each model year.(C) Detailed description of each model, including the vehicle type, vehicle mass, power, footprint, powertrain, and expected pricing.(D) The expected production cycle for each model, including new model introductions and redesign or refresh cycles.(ii)Technology evaluation information.(A) The CO2 reduction technologies employed by the manufacturer on each vehicle model, or projected to be employed, including information regarding the cost and CO2 -reducing effectiveness. Include technologies that improve air conditioning efficiency and reduce air conditioning system leakage, and any "off-cycle" technologies that potentially provide benefits outside the operation represented by the Federal Test Procedure and the Highway Fuel Economy Test.(B) An evaluation of comparable models from other manufacturers, including CO2 results and air conditioning credits generated by the models. Comparable vehicles should be similar, but not necessarily identical, in the following respects: vehicle type, horsepower, mass, power-to-weight ratio, footprint, retail price, and any other relevant factors. For manufacturers requesting alternative standards starting with the 2017 model year, the analysis of comparable vehicles should include vehicles from the 2012 and 2013 model years, otherwise the analysis should at a minimum include vehicles from the most recent two model years.(C) A discussion of the CO2 -reducing technologies employed on vehicles offered outside of the U.S. market but not available in the U.S., including a discussion as to why those vehicles and/or technologies are not being used to achieve CO2 reductions for vehicles in the U.S. market.(D) An evaluation, at a minimum, of the technologies projected by the Environmental Protection Agency in a final rulemaking as those technologies likely to be used to meet greenhouse gas emission standards and the extent to which those technologies are employed or projected to be employed by the manufacturer. For any technology that is not projected to be fully employed, explain why this is the case.(iii)Alternative fleet average CO2standards.(A) The most stringent CO2 level estimated to be feasible for each model, in each model year, and the technological basis for this estimate.(B) For each model year, a projection of the lowest feasible sales-weighted fleet average CO2 value, separately for passenger automobiles and light trucks, and an explanation demonstrating that these projections are reasonable.(C) A copy of any application, data, and related information submitted to NHTSA in support of a request for alternative Corporate Average Fuel Economy standards filed under 49 CFR part 525.(iv)Information supporting eligibility.(A) U.S. sales for the three previous model years and projected sales for the model years for which the manufacturer is seeking alternative standards.(B) Information regarding ownership relationships with other manufacturers, including details regarding the application of the provisions of § 86.1838-01(b)(3) regarding the aggregation of sales of related companies.(5)Alternative standards. Alternative standards apply as follows: (i) Where EPA has exercised its regulatory authority to administratively specify alternative standards, those alternative standards approved for model year 2021 continue to apply through model year 2026. Starting in model year 2027, manufacturers must certify to the standards in paragraph (h) of this section on a delayed schedule, as follows: | In model year . . . | Manufacturers must certify to the standards that would otherwise apply in . . . |
| (A) 2027 | 2025 |
| (B) 2028 | 2025 |
| (C) 2029 | 2027 |
| (D) 2030 | 2028 |
| (E) 2031 | 2030 |
(ii) EPA may approve a request from other manufacturers for alternative fleet average CO2 standards under this paragraph (g). The alternative standards for those manufacturers will apply by model year as specified in paragraph (g)(5)(i) of this section.(6)Restrictions on credit trading. Manufacturers subject to alternative standards approved by the Administrator under this paragraph (g) may not trade credits to another manufacturer. Transfers between car and truck fleets within the manufacturer are allowed, and the carry-forward provisions for credits and deficits apply. Manufacturers may generate credits in a given model year for trading to another manufacturer by certifying to the standards in paragraph (h) of this section for the current model year across the manufacturer's full product line. A manufacturer certifying to the standards in paragraph (h) of this section will no longer be eligible to certify to the alternative standards under this paragraph (g) in later model years.(7) Starting in model year 2032, all manufacturers must certify to the standards in paragraph (c) of this section.(h)Historical and interim standards. The following CO2 target values apply for model year 2031 and earlier vehicles:(1) CO2 target values apply as follows for passenger automobiles: Table 2 to Paragraph ( h )(1)-Historical and Interim CO 2
Target Values for Passenger Automobiles
| Model year | Footprint cutpoints (ft2 ) | CO 2 target value (g/mile) |
| Low | High | Below low cutpoint | Between cutpoints a | Above high cutpoint |
| 2012 | 41 | 56 | 244.0 | 4.72 * f + 50.5 | 315.0 |
| 2013 | 41 | 56 | 237.0 | 4.72 * f + 43.3 | 307.0 |
| 2014 | 41 | 56 | 228.0 | 4.72 * f + 34.8 | 299.0 |
| 2015 | 41 | 56 | 217.0 | 4.72 * f + 23.4 | 288.0 |
| 2016 | 41 | 56 | 206.0 | 4.72 * f + 12.7 | 277.0 |
| 2017 | 41 | 56 | 195.0 | 4.53 * f + 8.9 | 263.0 |
| 2018 | 41 | 56 | 185.0 | 4.35 * f + 6.5 | 250.0 |
| 2019 | 41 | 56 | 175.0 | 4.17 * f + 4.2 | 238.0 |
| 2020 | 41 | 56 | 166.0 | 4.01 * f + 1.9 | 226.0 |
| 2021 | 41 | 56 | 161.8 | 3.94 * f + 0.2 | 220.9 |
| 2022 | 41 | 56 | 159.0 | 3.88 * f -0.1 | 217.3 |
| 2023 | 41 | 56 | 145.6 | 3.56 * f -0.4 | 199.1 |
| 2024 | 41 | 56 | 138.6 | 3.39 * f -0.4 | 189.5 |
| 2025 | 41 | 56 | 130.5 | 3.26 * f -3.2 | 179.4 |
| 2026 | 41 | 56 | 114.3 | 3.11 * f -13.1 | 160.9 |
| 2027 | 42 | 56 | 135.9 | 0.66 * f + 108.0 | 145.2 |
| 2028 | 43 | 56 | 123.8 | 0.60 * f + 97.9 | 131.6 |
| 2029 | 44 | 56 | 110.6 | 0.54 * f + 87.0 | 117.0 |
| 2030 | 45 | 56 | 98.2 | 0.47 * f + 76.9 | 103.4 |
| 2031 | 45 | 56 | 85.3 | 0.41 * f + 66.8 | 89.8 |
| a Calculate the CO 2 target value for vehicles between the footprint cutpoints as shown, using vehicle footprint, f, and rounding the result to the nearest 0.1 g/mile. |
(2) CO2 target values apply as follows for light trucks: Table 3 to paragraph ( h )(2)-Historical and Interim CO 2
Target Values for Light Trucks
| Model year | Footprint cutpoints (ft2 ) | CO 2 target value (g/mile) |
| Low | High | Below low cutpoint | Between cutpoints a | Above high cutpoint |
| 2012 | 41 | 66.0 | 294.0 | 4.04 * f + 128.6 | 395.0 |
| 2013 | 41 | 66.0 | 284.0 | 4.04 * f + 118.7 | 385.0 |
| 2014 | 41 | 66.0 | 275.0 | 4.04 * f + 109.4 | 376.0 |
| 2015 | 41 | 66.0 | 261.0 | 4.04 * f + 95.1 | 362.0 |
| 2016 | 41 | 66.0 | 247.0 | 4.04 * f + 81.1 | 348.0 |
| 2017 | 41 | 50.7 | 238.0 | 4.87 * f + 38.3 | - |
| 2017 | 50.8 | 66.0 | - | 4.04 * f + 80.5 | 347.0 |
| 2018 | 41 | 60.2 | 227.0 | 4.76 * f + 31.6 | - |
| 2018 | 60.3 | 66.0 | | 4.04 * f + 75.0 | 342.0 |
| 2019 | 41 | 66.4 | 220.0 | 4.68 * f + 27.7 | 339.0 |
| 2020 | 41 | 68.3 | 212.0 | 4.57 * f + 24.6 | 337.0 |
| 2021 | 41 | 68.3 | 206.5 | 4.51 * f + 21.5 | 329.4 |
| 2022 | 41 | 68.3 | 203.0 | 4.44 * f + 20.6 | 324.1 |
|
| 2023 | 41 | 74.0 | 181.1 | 3.97 * f + 18.4 | 312.1 |
| 2024 | 41 | 74.0 | 172.1 | 3.77 * f + 17.4 | 296.5 |
| 2025 | 41 | 74.0 | 159.3 | 3.58 * f + 12.5 | 277.4 |
| 2026 | 41 | 74.0 | 141.8 | 3.41 * f + 1.9 | 254.4 |
| 2027 | 42 | 73.0 | 150.3 | 2.89 * f + 28.9 | 239.9 |
| 2028 | 43 | 72.0 | 136.8 | 2.58 * f + 25.8 | 211.7 |
| 2029 | 44 | 71.0 | 122.7 | 2.27 * f + 22.7 | 184.0 |
| 2030 | 45 | 70.0 | 108.8 | 1.98 * f + 19.8 | 158.3 |
| 2031 | 45 | 70.0 | 91.8 | 1.67 * f + 16.7 | 133.5 |
| a Calculate the CO 2 target value for vehicles between the footprint cutpoints as shown, using vehicle footprint, f, and rounding the result to the nearest 0.1 g/mile. |
75 FR 25686, May 7, 2010, as amended at 76 FR 19874, Apr. 8, 2011; 76 FR 39521, July 6, 2011; 76 FR 57377, Sept. 15, 2011; 77 FR 63156, Oct. 15, 2012; 79 FR 23725, Apr. 28, 2014; 81 FR 73985, Oct. 25, 2016; 85 FR 25268, Apr. 30, 2020; 86 FR 34371, June 29, 2021; 86 FR 74522, Dec. 30, 2021 81 FR 73985, 12/27/2016; 85 FR 25268, 6/29/2020; 86 FR 34371, 7/29/2021; 86 FR 74522, 2/28/2022; 89 FR 27842, 6/17/2024