• Air Toxics
• CMAQ
• Conformity

• Laws and Regulations
• Policy and Guidance
• Research
  • General Practice
  • Air Quality Planning and SIPs
  • Emissions Analysis
  • Land Use
  • Multi-Jurisdictional (Complex) Areas
  • Project Level Conformity
  • Small Urban and Rural Areas
  • Tools & Methodologies
  • Transportation Control Measures
• Reference Material
• Models & Methodologies
• Training

Tools & Methodologies

Research

• Improving Vehicle Fleet, Activity, and Emissions Data for On-Road Mobile Sources Emissions Inventories (September 2011). Prepared by the University of California at Riverside for FHWA, this report investigates several modeling concepts and methodologies in the MOVES emissions model and explores new data sources and new methods for utilizing existing data sources to improve the emission inventory and analysis of on-road mobile sources. New: 06/07/2013
• Modifying Link-Level Emissions Modeling Procedures for Applications within the MOVES Framework (September 2010) - Prepared by Eastern Research Group, Inc. for FHWA, the primary goal of the study was to ease the transition to the MOVES model by providing both a road map for developing updated emissions inventories, as well as an analysis of the likely impacts of the transition on the emissions inventories themselves.
• MOBILE6 Implementation Experience (June 2005) - FHWA, in conjunction with the Association of Metropolitan Planning Organizations (AMPO) Air Quality Subcommittee, worked with a group of MPOs to document their experience in applying MOBILE6 in the conformity process. Thus purpose of the study is to provide an understanding of what steps these organizations took to prepare for use of the new MOBILE model and to identify potential training and technical assistance needs. Specifically, this study documents how MPOs are implementing MOBILE6, what data are being collected locally, and how data are being collected and identifies implementation issues that arose during the transition to MOBILE6.
• Implications of the Implementation of the MOBILE6 Emissions Factor Model on Project-Level Impact Analyses Using the CAL3QHC Dispersion Model (August 2004) - Prepared by ICF Consulting for FHWA, this report discusses how revisions to the MOBILE model affect the estimation of localized CO concentrations, including problems and difficulties in the interaction of MOBILE6 with CAL3QHC, as well as recommendations for addressing these issues. In addition, this report discusses how the implementation of MOBILE6 impacts screening assessment procedures.
• Screening Procedures for Project-Level Hotspot Analysis (or PDF, 244KB) (April 2004) - FHWA Resource Center paper that provides a summary of project-level CO screening procedures developed and adopted by transportation agencies throughout the nation, highlights several innovative practices, and offers recommendations for developing refined screening protocols
• MOVES Research - EPA reports provided on its MOVES website
• Off-Model Air Quality Analysis: A Compendium of Practice - FHWA Resource Center paper about Off-Model methods (analyses performed without the specific use of a Travel Demand Model) being successfuly used in the South
• An Efficient Method To Assess Carbon Monoxide Pollutant For Transportation Projects - FHWA Resource Center paper about Florida DOT's use of a screening tool to assess worst-case CO scenarios
• Sensitivity Analysis of MOBILE6 Motor Vehicle Emission Factor Model (or PDF) - FHWA Resource Center paper that provides a basic evaluation of the MOBILE6 model behavior under various conditions

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