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State Implementation Plan Motor Vehicle Emissions Budgets

State Implementation Plan Motor Vehicle Emissions Budgets. March 25, 2003 Lynorae Benjamin U.S. EPA Region 4 Atlanta, Georgia. Overview. What? Why? Who & How? Where?. What is a Motor Vehicle Emissions Budget (MVEB)?. A MVEB is….

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State Implementation Plan Motor Vehicle Emissions Budgets

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  1. State Implementation PlanMotor Vehicle Emissions Budgets March 25, 2003 Lynorae Benjamin U.S. EPA Region 4 Atlanta, Georgia

  2. Overview • What? • Why? • Who & How? • Where?

  3. What is a Motor Vehicle Emissions Budget (MVEB)?

  4. A MVEB is… “… that portion of the total allowable emissions defined in the submitted or approved control strategy State Implementation Plan (SIP) revision or maintenance plan for a certain date for the purpose of meeting reasonable further progress milestones or demonstrating attainment or maintenance of the National Ambient Air Quality Standards, for any criteria pollutant or its precursors, allocated to highway and transit vehicle use and emissions.” – 40 CFR 93.101

  5. Why is the MVEB Important?

  6. The Clean Air Act Section 176(c)(2)(A) “…no transportation plan or transportation improvement program [TIP] may be...found to be in conformity…until a final determination has been made that emissions expected from implementation of such plans and programs are consistent with estimates of emissions from motor vehicles and necessary emissions reductions contained in the applicable implementation plan…”

  7. In a Nutshell, the MVEB… • Is the mechanism EPA has identified for demonstrating conformity of transportation plans, programs, and projects with the SIP. • Establishes a cap on emissions which cannot be exceeded by predicted highway and transit vehicle emissions.

  8. Ultimately, the MVEB is… • An integral part of the regulatory process to protect and enhance the quality of the Nation’s air resources so as to promote the public health and welfare and the productive capacity of its population.

  9. Who Creates the MVEB and How?

  10. Through Interagency Consultation “representatives of the [Metropolitan Planning Organizations], State and local air quality planning agencies, State and local transportation agencies, and other organizations with responsibilities for developing, submitting, or implementing provisions of [a SIP] required by the CAA must consult with each other and with local or regional offices of EPA, FHWA, and FTA on the development of the [SIP], the transportation plan, the TIP, and associated conformity determinations.” – 40 CFR 93.105(b)

  11. And Following EPA Guidance • Procedures for Emissions Inventory Preparation, Volume IV: Mobile Sources, December, 1992 • Preferred and Alternate Methods for Gathering and Locating Specific Emissions Inventory Data, June 1996 • Use of Locality-Specific Transportation Data for the Development of Mobile Source Emission Inventories, September, 1996 • Section 187 VMT Forecasting and Tracking Guidance, January, 1992

  12. Generalized MVEB Development Process Socioeconomic & Land Use Characteristics, Transportation Networks, etc. Fleet & Fuel Characteristics; Speed, Temperature, etc. Emissions Factors Motor Vehicle Emission Budgets Vehicle Fleet Activity

  13. Some Key Considerations in MVEB Development • MOBILE emissions factor model input • Vehicle-miles traveled (VMT) forecasting methodology • Latest planning assumptions • Off-model methodologies • Consistency with conformity analysis methodology • Safety margin

  14. MOBILE Model Input • Annual mileage accumulation rates • Control programs • Fuel specifications • Operating mode fractions • Registration distributions • Speeds • Temperature • VMT mix

  15. VMT Forecasting Methodology • EPA encourages the use of transportation models in the development of MVEBs. • Model VMT estimates should be made consistent with Highway Performance Monitoring System in the aggregate. • Model VMT should be adjusted for seasonal effects. • If not accounted for in the model, estimates of VMT on lower functional systems must be prepared and included.

  16. Latest Planning Assumptions • MVEBs must be based on the most current information available for the year that the budget is established. • Interagency consultation should be used to determine which planning assumptions are considered the latest and best. • It is expected that planning assumptions in the conformity process will change over time from those used in the SIP.

  17. Consistency Between SIP MVEB & Regional Emissions Analysis Methodologies • 40 CFR 93.122(a)(6) requires that the MOBILE inputs used in the conformity analysis be consistent with the SIP. • SIP MVEB and regional emissions analysis methodologies should be as consistent as possible to ensure “apples to apples” emissions comparisons in the conformity determination.

  18. Off-Model Methodologies • E.g., voluntary measures affecting motor vehicle emissions, adjustments for emissions factor effects not included in MOBILE. • As with the MOBILE and travel models, interagency consultation should be used to evaluate off-model methodologies. • All methodologies, assumptions, and calculations must be fully documented and supported and submitted during the review process.

  19. Safety Margin • “…the amount by which the total projected emissions from all sources of a given pollutant are less than the total emissions that would satisfy the applicable requirement for reasonable further progress, attainment, or maintenance.” – 40 CFR 93.101 • The SIP may allocate a portion or all of the safety margin to the MVEBs. • The safety margin must be clearly identified and quantified in the SIP.

  20. What is Adequacy?

  21. Adequacy Is… • A process EPA uses to determine whether submitted MVEBs may be used for transportation conformity purposes before the SIP and MVEBs are approved. • The minimum adequacy criteria are contained in 40 CFR 93.118(e)(4), e.g., the MVEBs, when considered together with all other emissions sources, must be consistent with the purpose of the SIP (e.g., reasonable further progress, attainment, maintenance).

  22. EPA intends to review and determined the Adequacy of MVEBs within 90 days of Submittal using a three-part process: public notification that EPA has received a formal SIP submittal with a MVEB requiring adequacy review. 30-day public comment period. Public notification of EPA’s adequacy determination and response to comments. EPA’s Adequacy Process

  23. In General • Budgets from an approved SIP cannot be replaced by budgets from a submitted SIP until that submitted SIP is approved. • Budgets from a submitted SIP can be used once they’re found adequate if there are no approved budgets that cover the same timeframe and CAA requirement as the submitted SIP.

  24. Where Can You Get More Info?

  25. Download from the Web • Procedures for Emission Inventory Preparation, Volume IV: Mobile Sources, December, 1992 • http://www.epa.gov/oms/invntry/r92009.pdf • Preferred and Alternate Methods for Gathering and Locating Specific emission Inventory Date, June, 1996 • http://wwww.epa.gov/ttn/chief/elip/elip_ms.htm • Use of Locality-specific Transportation Data for the Development of Mobile source emission Inventories, September, 1996 • http://www.epa.gov.oms/models.htm • Conformity rule and guidance documents • http://www.epa.gov/otaq/transp/traqconf.htm

  26. EPA Region 4 Contacts • MVEB/SIP Information • Lynorae Benjamin; (404) 562-9040; benjamin.lynorae@epa.gov • Mobile Emissions Inventory/Mobile Emissions Model • Dale Aspy; (404) 562-9041; aspy.dale@epa.gov • Transportation Control Measures and Conformity • Kelly Sheckler; (404) 562-9042; sheckler.kelly@epa.gov • Quantification of Voluntary Measure and Off-Model Calculation Techniques • Alan Powell; (404) 562-9045; powell.alan@epa.gov

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