Comparisons of alternative build and no-build scenarios in project-level air quality analyses for NEPA and conformity typically focus on comparisons of emissions and/or ambient concentrations of pollutants, namely greenhouse gases

Emission factors versus speed curves generated using the MOVES3 model exhibit very anomalous behavior at higher road grades that are within the range encountered in project-level air quality analyses for

The recently completed NCHRP study (20-05 Topic 51-18 Practices for Project-Level Analyses for Air Quality) included a recommendation for the development of a template guidance document for the preparation of

TERI Database Administrator Notes:  Not recommended at present time by 2009 Air Quality Subcommittee.  PART5 calculates exhaust emission factors for primary emitted particulates, brake and tire wear emissions, and re-entrained

TERI Administrator Note (January 2009): Project funded as NCHRP 25-25-59 in 2009 The effect of control strategies on both PM and ozone is important because many areas of the country

Background: Federal guidance[1] requires detailed emission modeling for mobile source air toxic emissions (MSATs) for transportation projects that meet certain traffic and other criteria. As the development of the requisite

TERI Administrator Note (Feb 2009) Related Research: Diesel Retrofit Technology – An Analysis of the Cost-Effectiveness of Reducing Particulate Matter and Nitrogen Oxides Emissions from Heavy-Duty Nonroad Diesel Engines Through

The environmental performance of public transportation services plays a key role in improving air quality in urban areas. Replacing vehicles’ current engines with innovative propulsive systems may be an effective

Background Truck freight operations are a major source of air pollutants, including criteria pollutants, toxic air pollutants and greenhouse gas emissions. Although the 2008-2010 recession has led to recent reductions

Background The concurrent introduction in the past year of models (MOVES2010 and AERMOD) and guidance new to project-level “hot-spot” analyses poses significant challenges for state DOTs and other agencies with

TERI Administrator Note – Selected as FY12 NCHRP Project 25-38 RESEARCH PROBLEM STATEMENT  In the March 2, 2010 Federal Register (FR), EPA approved and announced the availability of the Motor

Traffic flow has many adverse effects on its surroundings. Efforts to improve traffic operations traditionally focus on some of these factors, such as trip time and stop delay, and try

Freight transportation is a major contributor of greenhouse gases and other air pollutants in the U.S.  Much of these emissions are due to truck operations, which have relatively higher emissions

There are several types of models used in analyzing highway emission impacts to air quality for both regional analysis and project or hotspot analysis. These models include traffic operations, transportation

Scope: Background:  Efforts to develop and deploy clean energy, and transportation technologies that use clean energy (e.g., electric power), are impacted by fluctuating fossil fuel prices.  Incentives to deploy clean energy that

Effective December 20, 2012, a new era in air quality analyses for transportation projects began as federal transportation conformity rule requirements and associated guidance issued by the US EPA for

The proposed study would develop a practical guide for (or compendium of) mitigation measures for air quality for typical highway and transit projects that, ultimately, may serve as the basis

Successful research efforts require identifying all of the conditions and unknowns surrounding the area of interest and then defining them. This requires developing a plan for conducting research which identifies

The development of standard reference cases for modeling various project types and pollutants would benefit state DOTs that are transitioning to the new federal models and guidance for project-level air

DOTs and other agencies working on transportation-related air quality issues are under increasing financial and environmental constraints. Several of these agencies put forward research ideas and fund research projects in

Templates for modeling of various typical transportation project types would be developed in this proposed study. The modeling would be conducted using the latest updates to US EPA models and

Regulatory-mandated air quality analysis, such as SIP analysis, transportation conformity determinations, and project level evaluations typically require the use of multiple models (model chain) to analyze a complex chain of land use

Federal and state objectives for streamlining project development may be supported in general by the development and implementation of programmatic agreements (PAs) and, where federal requirements for transportation conformity apply,

While there are a number of published studies that provide information to state and local agencies about the potential emission reduction benefits of control strategies that are designed to reduce

There are many air pollution emission components associated with motor vehicles, which historically have been subjected to stricter and stricter environmental controls, including running exhaust, crankcase running exhaust, cold start,

The purpose of this research is to evaluate modeling techniques and ambient measurements to comprehensively understand and explain vehicle emissions contributions to local air quality. The research will consist of

In 2007, the National Research Council (NRC) issued the landmark report “Models in Environmental Regulatory Decision Making” (https://www.nap.edu/catalog/11972/models-in-environmental-regulatory-decision-making). It assessed EPA’s use of computer models in developing regulations and recommended

This research will provide information on the sensitivity of ambient air quality to project-level traffic and other key inputs in the traffic, emission and dispersion modeling chain including meteorological inputs.

Electric vehicle charging stations are becoming more commonplace in many states but vary as to type and format and usage-there is no consensus as to how they should be funded

RESEARCH PROBLEM STATEMENT Interstate highway improvement projects that are deemed to have traffic noise impacts result in near-road barrier walls being constructed or expanded. Although the barriers are designed and

Background: New vehicle technologies, publically sponsored programs, and public-private partnerships designed for various reasons but applicable to reduce vehicle-generated emissions have been emerging for a decade or more. These include

Background: There are several types of models used in analyzing highway emission impacts to air quality for both regional analysis and project or hotspot analysis and for both for NEPA

State DOTs would benefit from guidance that goes beyond the norm on how to conduct modeling for project-level air quality analyses and addresses which modeling inputs are the most cost-effective

This project aims to model the environmental effect of a new form of car sharing system with free-floating vehicles. The free-floating vehicle system, unlike traditional car-sharing systems, is based on

The objective of this project is to develop guidance on how to apply microscopic traffic simulation models to project level emissions analysis, focusing specifically on vehicle trajectory information. This project

To comply with the transportation conformity requirements, state and local transportation agencies use various transportation strategies designed to reduce air pollutant emissions in nonattainment and maintenance areas by improving traffic

For project level analysis using MOVES model, detailed link level activity (volume, speed, source type mix, etc.) information are used to estimate link level emission rates or total emissions. Studies

This research would analyze the new California Truck Survey data to develop MOVES model inputs and compare inputs developed from this survey with other sources. It would also provide suggestions

State DOTs would benefit from guidance that goes beyond the norm on how to conduct modeling for project-level air quality analyses and addresses which modeling inputs are the most cost-effective

    Air quality project-level analyses (PLAs) that state Departments of Transportation (DOTs) are required to prepare for purposes of the National Environmental Policy Act (NEPA) and the EPA transportation

Background For purposes of the National Environmental Policy Act (NEPA) process, Federal agencies have initiated efforts on how to assess the impacts of potential GHG emissions from proposed Federal actions

On-road mobile sources are still considered a major pollution source, especially in high-density urban areas. Regulatory measures have significantly decreased the emissions from tailpipes but other uncontrolled emissions from brake-wear,

When a transportation project is undertaken, an air quality analysis may be required to meet federal and/or state requirements related to U.S. EPA transportation conformity regulations, NEPA, associated FHWA guidance,

The objective of this project is to develop guidance on how to apply microscopic traffic simulation models to project level emissions analysis, focusing specifically on vehicle trajectory information. This project

Background On January 18, 2017, the Federal Highway Administration (FHWA) published the final performance measure rule (PM3) under MAP-21. This rule, which took effect on May 20, 2017, established CMAQ

A major update to the MOVES emission model used in air quality analyses of transportation improvement projects is expected later this year, which may result in significant changes to forecast

Traffic volumes dropped substantially across the nation as a result of stay-at-home policies implemented during the coronavirus pandemic, resulting in improved air quality which in turn can lead to improved