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Transportation Conformity and Development of Emission Budgets

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Transportation Conformity and Development of Emission Budgets. What are our objectives?. We will cover the following topics: CAA Transportation Conformity Regulations Development of Emission Budgets. What Is Conformity?. Established by the Clean Air Act

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Presentation Transcript

What are our objectives?

  • We will cover the following topics:
  • CAA Transportation Conformity Regulations
  • Development of Emission Budgets

What Is Conformity?

  • Established by the Clean Air Act
  • Requires governments to evaluate emissions from planned federal or federally funded projects BEFORE they are built
  • Applies in ozone, CO, PM-10 and NO2 areas designated as nonattainment or maintenance

Conformity: Transportation vs. General

  • Transportation conformity applies to federal highway and transit actions
  • General conformity applies to all other federal actions (e.g. airports and railroads)

Off-Road Mobile Sources






On-Road Mobile Sources

Transportation Conformity: What pollution does it address?

  • Transportation conformity addresses air pollution from on-road mobile sources.
  • On-road mobile sources are emissions created by cars, trucks, and transit.

Transportation Conformity…covers just one piece of the pie...


What Transportation Actions are Subject to Conformity?

  • Transportation plans (20-year timeframe)
  • Transportation improvement programs (TIP) (3-year timeframe)
  • “Federal” projects
    • projects receiving federal funding
    • projects receiving FHWA/FTA approval
  • Regionally significant State projects are partially affected

Transportation Plan and

State Implementation

Plan (SIP)

Transportation Improvement

Program (TIP)

Transportation Conformity: A Link Between Air Quality and Transportation Planning


sip elements
SIP Elements
  • Inventory of emissions estimates for each sector (stationary, area, mobile)
  • Air quality modeling
  • Demonstration of SIP’s purpose
  • Specific list of controls
  • Contingency measures (maintenance areas)

SIP MV Budgets

  • SIPs contain motor vehicle emissions budgets (“budgets”)
  • SIP budgets based on area’s motor vehicle inventoryand control measures
  • Budgets important for conformity because used in regional emissions analysis
  • Budget test: emissions from planned transportation system < budget
    • budget = ceiling on emissions of that pollutant / precursor
adequacy review of budgets
Adequacy Review of Budgets
  • SIP budgets must be adequate before used for conformity
  • Conformity rule (93.118(e)(4)) describes adequacy criteria
    • these criteria are similar to those for SIP approval
  • Positive adequacy finding does not guarantee approvability of SIP
adequacy criteria
Governor Endorsement

Public Hearing

Interagency consultation and full documentation

EPA concerns addressed

Control measures achieve air quality goals (RFP, attainment, maintenance)

Adequacy Criteria
adequacy criteria1
Adequacy Criteria
  • Emissions budget(s) clearly identified and precisely quantified in the SIP
  • Budget is consistent with emissions inventory/control measures
  • Revisions to previously submitted SIPs are explained
  • EPA will review public comment from state’s public hearing
adequacy process
Approximately 90 day process

State submits SIP to EPA

EPA announces receipt of SIP on website, 30-day public comment period started

EPA makes adequacy/inadequacy finding

Respond to any comments

Send letter to state

Post finding on web

Issue a Federal Register notice (FRN)

Finding effective 15 Days after FRN in most cases

Adequacy Process