40 CFR 80.42 - Simple emissions model.

Status message

There are 3 Updates appearing in the Federal Register for 40 CFR 80. View below or at eCFR (GPOAccess)
§ 80.42 Simple emissions model.
(a) VOC emissions. The following equations shall comprise the simple model for VOC emissions. The simple model for VOC emissions shall be used only in determining toxics emissions:
Summer = The period of May 1 through September 15
Winter = The period of September 16 through April 30
EXHVOCS1 = Exhaust nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 1 during the summer period.
EXHVOCS2 = Exhaust nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 2 during the summer period.
EXHVOCW = Exhaust nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, during the winter period.
EVPVOCS1 = Evaporative nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 1 during the summer period.
EVPVOCS2 = Evaporative nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 2 during the summer period.
RLVOCS1 = Running loss nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 1 during the summer period.
RLVOCS2 = Running loss nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 2 during the summer period.
REFVOCS1 = Refueling nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 1 during the summer period.
REFVOCS2 = Refueling nonmethane, nonethane VOC emissions from the fuel in question, in grams per mile, for VOC control region 2 during the summer period.
OXCON = Oxygen content of the fuel in question, in terms of weight percent (as measured under § 80.46)
RVP = Reid vapor pressure of the fuel in question, in pounds per square inch (psi)
(1) The following equations shall comprise the simple model for VOC emissions in VOC Control Region 1 during the summer period:
EXHVOCS1 = 0.444×(1−(0.127/2.7)×OXCON)
EVPVOCS1 = 0.7952−0.2461×RVP 0.02293×RVP×RVP
RLVOCS1 = −0.734 0.1096×RVP 0.002791×RVP×RVP
REFVOCS1 = 0.04×((0.1667×RVP)−0.45)
(2) The following equations shall comprise the simple model for VOC emissions in VOC Control Region 2 during the summer period:
EXHVOCS2 = 0.444 × (1 − (0.127/2.7) × OXCON)
EVPVOCS2 = 0.813 − 0.2393 × RVP 0.021239 × RVP × RVP
RLVOCS2 = 0.2963 − 0.1306 × RVP 0.016255 × RVP × RVP
REFVOCS2 = 0.04 × ((0.1667 × RVP) − 0.45)
(3) The following equation shall comprise the simple model for VOC emissions during the winter period:
EXHVOCW = 0.656 × (1 − (0.127/2.7) × OXCON)
(b) Toxics emissions. The following equations shall comprise the simple model for toxics emissions:
EXHBEN = Exhaust benzene emissions from the fuel in question, in milligrams per mile
EVPBEN = Evaporative benzene emissions from the fuel in question, in milligrams per mile
HSBEN = Hot soak benzene emissions from the fuel in question, in milligrams per mile
DIBEN = Diurnal benzene emissions from the fuel in question, in milligrams per mile
RLBEN = Running loss benzene emissions from the fuel in question, in milligrams per mile
REFBEN = Refueling benzene emissions from the fuel in question, in milligrams per mile
MTBE = Oxygen content of the fuel in question in the form of MTBE, in terms of weight percent (as measured under § 80.46)
ETOH = Oxygen content of the fuel in question in the form of ethanol, in terms of weight percent (as measured under § 80.46)
ETBE = Oxygen content of the fuel in question in the form of ETBE, in terms of weight percent (as measured under § 80.46)
FORM = Formaldehyde emissions from the fuel in question, in milligrams per mile
ACET = Acetaldehyde emissions from the fuel in question, in milligrams per mile
POM = Emissions of polycyclic organic matter from the fuel in question, in milligrams per mile
BUTA = Emissions of 1,3-Butadiene from the fuel in question, in milligrams per mile
FBEN = Fuel benzene of the fuel in question, in terms of volume percent (as measured under § 80.46)
FAROM = Fuel aromatics of the fuel in question, in terms of volume percent (as measured under § 80.46)
TOXREDS1 = Total toxics reduction of the fuel in question during the summer period for VOC control region 1 in percent
TOXREDS2 = Total toxics reduction of the fuel in question during the summer period for VOC control region 2 in percent
TOXREDW = Total toxics reduction of the fuel in question during the winter period in percent
(1) The following equations shall comprise the simple model for toxics emissions in VOC control region 1 during the summer period:
TOXREDS1 = [100 × (53.2 −EXHBEN − EVPBEN − RLBEN − REFBEN − FORM − ACET − BUTA − POM)] / 53.2
EXHBEN = [1.884 0.949 × FBEN 0.113 × (FAROM − FBEN)) / 100] × 1000 × EXHVOCS1
EVPBEN = HSBEN DIBEN
HSBEN = FBEN × (EVPVOCS1 × 0.679) × 1000 × [(1.4448 − (0.0684 × MTBE/2.0) − (0.080274 × RVP)) / 100]
DIBEN = FBEN × (EVPVOCS1 × 0.321) × 1000 × [(1.3758 − (0.0579 × MTBE/2.0) − (0.080274 × RVP)) / 100]
RLBEN = FBEN × RLVOCS1 × 1000 × [(1.4448 − (0.0684 × MTBE/2.0) − (0.080274 × RVP)) / 100]
REFBEN = FBEN × REFVOCS1 × 1000 × [(1.3972 − (0.0591 × MTBE / 2.0) − (0.081507 × RVP)) / 100] BUTA = 0.00556 × EXHVOCS1 × 1000
POM = 3.15 × EXHVOCS1
(i) For any oxygenate or mixtures of oxygenates, the formaldehyde and acetaldehyde shall be calculated with the following equations:
FORM = 0.01256 × EXHVOCS1 × 1000 × [1 (0.421 / 2.7) × MTBE TAME) (0.358 / 3.55) × ETOH (0.137 / 2.7) × (ETBE ETAE)]
ACET = 0.00891 × EXHVOCS1 × 1000 × [1 (0.078 / 2.7) × (MTBE TAME) (0.865 / 3.55) × ETOH (0.867 / 2.7) × (ETBE ETAE)]
(ii) When calculating formaldehyde and acetaldehyde emissions using the equations in paragraph (b)(1)(i) of this section, oxygen in the form of alcohols which are more complex or have higher molecular weights than ethanol shall be evaluated as if it were in the form of ethanol. Oxygen in the form of methyl ethers other than TAME and MTBE shall be evaluated as if it were in the form of MTBE. Oxygen in the form of ethyl ethers other than ETBE shall be evaluated as if it were in the form of ETBE. Oxygen in the form of non-methyl, non-ethyl ethers shall be evaluated as if it were in the form of ETBE. Oxygen in the form of methanol or non-alcohol, non-ether oxygenates shall not be evaluated with the Simple Model, but instead must be evaluated through vehicle testing under the Complex Model per § 80.48.
(2) The following equations shall comprise the simple model for toxics emissions in VOC control region 2 during the summer period:
TOXREDS2 = 100 × (52.1 − EXHBEN − EVPBEN − RLBEN − REFBEN − FORM − ACET − BUTA − POM) / 52.1
EXHBEN = [(1.884 0.949 × FBEN 0.113 × (FAROM − FBEN)) / 100] × 1000 × EXHVOCS2
EVPBEN = HSBEN DIBEN
HSBEN = FBEN × (EVPVOCS2 × 0.679) × 1000 × [(1.4448 − (0.0684 × MTBE / 2.0) − (0.080274 × RVP)) / 100]
DIBEN = FBEN × (EVPVOCS2 × 0.321) × 1000 × [(1.3758 − (0.0579 × MTBE / 2.0) − (0.080274 × RVP)) / 100]
RLBEN = FBEN × RLVOCS2 × 1000 × [(1.4448 − (0.0684 × MTBE / 2.0) − (0.080274 × RVP)) / 100]
REFBEN = FBEN × REFVOCS2 × 1000 × [(1.3972 − (0.0591 × MTBE / 2.0) − (0.081507 × RVP)) / 100]
BUTA = 0.00556 × EXHVOCS2 × 1000
POM = 3.15 × EXHVOCS2
(i) For any oxygenate or mixtures of oxygenates, the formaldehyde and acetaldehyde shall be calculated with the following equations:
FORM = 0.01256 × EEXHVOCS2 × 1000 × [1 (0.421 / 2.7) × (MTBE TAME) (0.358 / 3.55) × ETOH (0.137 / 2.7) × (ETBE ETAE)]
ACET = 0.00891 × EXHVOCS2 × 1000 × [1 (0.078 / 2.7) × (MTBE TAME) (0.865 / 3.55) × ETOH (0.867 / 2.7) × (ETBE ETAE)]
(ii) When calculating formaldehyde and acetaldehyde emissions using the equations in paragraph (b)(2)(i) of this section, oxygen in the form of alcohols which are more complex or have higher molecular weights than ethanol shall be evaluated as if it were in the form of ethanol. Oxygen in the form of methyl ethers other than TAME and MTBE shall be evaluated as if it were in the form of MTBE. Oxygen in the form of ethyl ethers other than ETBE shall be evaluated as if it were in the form of ETBE. Oxygen in the form of non-methyl, non-ethyl ethers shall be evaluated as if it were in the form of ETBE. Oxygen in the form of methanol or non-alcohol, non-ether oxygenates shall not be evaluated with the Simple Model, but instead must be evaluated through vehicle testing under the Complex Model per § 80.48.
(3) The following equations shall comprise the simple model for toxics emissions during the winter period:
TOXREDW = 100 × (55.5 − EXHBEN − FORM − ACET − BUTA − POM) / 55.5
EXHBEN = [(1.884 0.949 × FBEN 0.113 × (FAROM − FBEN)) / 100] × 1000 × EXHVOCW
BUTA = 0.00556 × EXHVOCW × 1000
POM = 2.13 × EXHVOCW
(i) For any oxygenate or mixtures of oxygenates, the formaldehyde and acetaldehyde shall be calculated with the following equations:
FORM = 0.01256 × EXHVOCS1 × 1000 × [1 (0.421 / 2.7) × (MTBE TAME) (0.358 / 3.55) × ETOH (0.137 / 2.7) × (ETBE ETAE)]
ACET = 0.00891 × EXHVOCS1 × 1000 × [1 (0.078 / 2.7) × (MTBE TAME) (0.865 / 3.55) × ETOH (0.867 / 2.7) × (ETBE ETAE)]
(ii) When calculating formaldehyde and acetaldehyde emissions using the equations in paragraph (b)(3)(i) of this section, oxygen in the form of alcohols which are more complex or have higher molecular weights than ethanol shall be evaluated as if it were in the form of ethanol. Oxygen in the form of methyl ethers other than TAME and MTBE shall be evaluated as if it were in the form of MTBE. Oxygen in the form of ethyl ethers other than ETBE shall be evaluated as if it were in the form of ETBE. Oxygen in the form of non-methyl, non-ethyl ethers shall be evaluated as if it were in the form of ETBE. Oxygen in the form of methanol or non-alcohol, non-ether oxygenates shall not be evaluated with the Simple Model, but instead must be evaluated through vehicle testing under the Complex Model per § 80.48.
(4) If the fuel aromatics content of the fuel in question is less than 10 volume percent, then an FAROM value of 10 volume percent shall be used when evaluating the toxics emissions equations given in paragraphs (b)(1), (b)(2), and (b)(3) of this section.
(c) Limits of the model.
(1) The model given in paragraphs (a) and (b) of this section shall be used as given to determine VOC and toxics emissions, respectively, if the properties of the fuel being evaluated fall within the ranges shown in this paragraph (c). If the properties of the fuel being evaluated fall outside the range shown in this paragraph (c), the model may not be used to determine the VOC or toxics performance of the fuel:
Fuel parameter Range
1 For gasoline sold in California, the applicable RVP range shall be 6.4-9.0 psi.
Benzene content 0.0-4.9 vol %.
RVP 6.6-9.0 psi. 1
Oxygenate content 0-4.0 wt %.
Aromatics content 0-55 vol %.
(2) The model given in paragraphs (a) and (b) of this section shall be effective from January 1, 1995 through December 31, 1997, unless extended by action of the Administrator.
[59 FR 7813, Feb. 16, 1994, as amended at 59 FR 36958, July 20, 1994; 61 FR 20738, May 8, 1996]

Title 40 published on 2014-07-01

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-08-08; vol. 79 # 153 - Friday, August 8, 2014
    1. 79 FR 46353 - Regulation of Fuels and Fuel Additives: Extension of Compliance and Attest Engagement Reporting Deadlines for 2013 Renewable Fuel Standards
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Direct final rule.
      This rule is effective on September 29, 2014 without further notice, unless the EPA receives adverse comment by September 15, 2014. If the EPA receives adverse comment, we will publish a timely withdrawal notice in the Federal Register informing the public that the rule will not take effect.
      40 CFR Part 80

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code

Title 40 published on 2014-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 80 after this date.

  • 2014-08-28; vol. 79 # 167 - Thursday, August 28, 2014
    1. 79 FR 51288 - Regulation of Fuels and Fuel Additives: Extension of the Reformulated Gasoline Program to Maine's Southern Counties
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Proposed rule.
      Comments must be received on or before September 29, 2014 unless a public hearing is requested by September 12, 2014. If the EPA receives such a request, we will publish information related to the timing and location of the hearing and a new deadline for public comment.
      40 CFR Part 80