Clean Transportation

ERG supports clean transportation at all levels of government in the U.S. and abroad. We help agencies ensure that engines and vehicles in use now are as clean as possible, while also supporting the transition to use of 21st century, low-carbon transportation technologies. At ports, airports, rail yards, construction sites, and on roads, our multidisciplinary transportation experts monitor and reduce emissions; plan and implement fleet electrification; calculate and model life cycles and cost-benefits of alternative fuels and technologies; and galvanize stakeholders to improve air quality and reduce climate impacts from transportation.

Vehicle Electrification, Supply Equipment, and Alternative Fuels
  • Market research on future vehicle models
  • Cost-benefit analysis of new vehicle acquisition
  • EVSE installation support
  • Renewable (e.g., solar) charging options, batteries
  • Biofuel deployment and life-cycle analysis
Real-World Characterization of On- and Non-Road Sources and Activity
  • Telematics data analysis (in collaboration with GeoTab, StreetLight, Verizon, and others)
  • Portable emission measurement and activity monitoring system instrumentation
  • Remote sensing device data collection
  • Statistical analysis of activity and emissions data
  • Fleet operations and equipment activity surveys
  • Marine Automatic Identification System analysis
  • Matching vessels and aircraft to their engine and operating characteristics
  • Application of geographic information systems data
Comprehensive Emission Inventories
  • Greenhouse gases, criteria pollutants, particulate matter, toxics, black carbon
  • National Emissions Inventory, State Implementation Plan/Transportation Conformity analysis
  • Light- and heavy-duty on-road vehicles and nonroad equipment (e.g., construction, agricultural)
  • Aircraft/airports, locomotives, and marine vessels and port equipment
  • Trend forecasting
Economic and Regulatory Support for Transportation Initiatives
  • Valuation of non-market benefits (e.g., social cost of carbon and public health benefits from reduced criteria pollutants)
  • Evaluation of control and compliance programs
Diesel Emissions Reductions
  • Heavy-duty onroad emission testing and inspection/maintenance
  • Diesel Emissions Quantifier (DEQ) development and application for DERA
  • Green freight and other voluntary program strategies
  • Stakeholder engagement on funding of diesel emissions reduction strategies
  • Nonroad controls/technology strategies
  • Fleet-specific surveys and control evaluations
  • Specialized emission factors and modeling
Emissions Modeling
  • MOVES/EMFAC development and applications
  • NONROAD/OFFROAD modeling
  • Spatial Emissions Estimator (SEE) link-level emissions modeling utility
  • Freight shipper/carrier emission footprint and benchmarking tools
  • Development of region-specific railroad emissions models
  • FAA Aviation Environmental Design Tool
  • EPA Commercial Marine Vessel Model
  • DOE Argonne Laboratory’s GREET Model
Evaluating Control Strategies
  • Remote Sensing Device program effectiveness
  • Engine modification and retrofit effectiveness
  • Advanced fuel efficiency technologies
  • Analysis of new and proposed emission and fuel economy standards
  • Tools to estimate rail yard emission reductions


Service Area Leads

Shanika Amarakoon

As an immigrant, issues of race, equity, and inclusion have always been central to my lived experience and values. As an environmental engineer and policy analyst, I feel grateful to align my convictions with my experience and to lead ERG’s environmental and climate justice solutions practice.

Shanika Amarakoon

Rick Baker

The environmental issues we face today are complex and multi-faceted. Reducing emissions of greenhouse gases, ozone precursors, particulates, and other pollutants involves careful application of a variety of skill sets. Working at ERG allows me to collaborate with a wide range of national experts in environmental science, engineering, statistics, economic and policy analysis, IT, and communications in order to develop integrative solutions to these problems. The work challenges me to continually expand my abilities and my perspective.

Rick Baker

Richard Billings

These are exciting times. Rapid increases in computing power and greater availability of relevant data sets are making it possible to create systems that quantify emissions from aircraft, marine vessels, and railways. I am proud to be part of a team of experienced scientists and engineers at ERG with whom I can do high-quality work in this increasingly complex, challenging environment. By combining our perspectives and skill sets, we leverage these new opportunities and solve the problems inherent in handcrafting state-of-the-art air data sets.

Richard Billings

Photo of Roger Chang

Happily, I’m able to say that the work I do helps the environment and people and not the other way around.

Roger Chang

Tim DeFries

In my line of work, the data are often noisy and incomplete. Creativity, critical thinking, and precision are essential to avoid reaching incorrect conclusions—and that’s part of what I love about my work. I get to collaborate with great colleagues and clients in developing and rigorously implementing innovative solutions to provide credible results.

Tim DeFries

Photo of Allison DenBleyker

I am passionate about connecting live data to the modeling systems that inform air quality planning.

Allison DenBleyker

Photo of Jonathan Ells

I come from a family devoted to public service, so there’s nowhere I would rather be than on the leading edge of sustainability, helping decision-makers at all levels understand the best available options for reducing their environmental footprint and protecting people and places from the ever-increasing impacts of climate change.

Jonathan Ells

Photo of Charles Goodhue

As an economist, I have come to appreciate that the qualitative context—including co-benefits, benefits distribution, environmental and health impacts, and social and political obstacles—can be as essential to decision-making as the numerical outputs. I enjoy working holistically with my government and community clients to determine how best to meet their needs and communicate the results.

Charles Goodhue

Photo of Ted Hogan

At ERG, I thrive on learning something new, meeting someone interesting, and contributing solutions that address transportation’s impact on climate change and vice versa. Whether working in the local, state, federal, or international arena, I enjoy collaborating across and beyond ERG to find creative ways to communicate information, engage audiences, and engineer solutions in service of our clients and their goals.

Ted Hogan

Sandeep Kishan

I have dedicated my career to reducing the energy and emission footprint of vehicle travel, a major source of air pollution worldwide. Thanks to inspiration from great mentors and clients, I had the opportunity to build and manage what has become a world-class team of mobile sources experts who relish the challenge of tackling complex problems. Disadvantaged communities experience a disproportional impact from vehicle-related air pollution, and I am gratified beyond measure that our work has helped improve air quality, not only across the United States but also in other countries around the world, where we have facilitated development of customized solutions based on local conditions.

Sandeep Kishan

John Koupal

Thanks to a summer job at EPA—where I went into a frigid test cell in a parka at 5:00 each morning to prepare cars for emission testing—I became hooked on environmental work. After many years supporting EPA in developing several major air emission rules, I find it deeply gratifying to apply the knowledge I’ve acquired to help other countries take similar measures to achieve significant reductions in their pollution.

John Koupal

Jim Lindner

Throughout my career, first at EPA’s Office of Transportation and Air Quality and now with ERG’s mobile sources group, the best part of my work has been helping others—for example, by analyzing available data (which never seem to be ideal), explaining the results to technical and non-technical audiences in ways they can readily understand, and providing options for moving forward. It also seems to help if I try to listen more than I talk, not to take myself too seriously, and share a few laughs along the way.

Jim Lindner

Lindy Lowe

My favorite problems are the difficult ones—those sticky, multi-jurisdictional, multi-sector problems that require us to find new partners, develop new frameworks for working together, and be brave, humble, and kind. I love building frameworks that enable the person with the least amount of power and the person with the most amount of power to share their perspectives and contribute to solutions. Whatever the issue, my goals are to develop transparent, equitable, and effective solutions and to have fun along the way!

Lindy Lowe

Photo of Heather Perez

Improving global health demands innovative solutions and evolving perspectives. I thrive on developing cutting-edge methodologies and promoting novel insights made possible by advances in data quality, quantity, and availability.

Heather Perez

Michael Sabisch

I feel incredibly fortunate to have a job where I can work with gifted colleagues on challenging projects supporting important efforts. The work is diverse and dynamic, and ERG gives our team the resources we need to be successful, as we try to leave the world a better place for future generations.

Michael Sabisch

Ian Todreas

If all the world’s our stage, then our first act must be to restore and protect it—for ourselves and future generations. I feel honored to work among the best, brightest, and most deeply committed individuals to address the causes and impacts of climate change using the most powerful tool we possess: language.

Ian Todreas

Photo of Ben Young

Both companies and the public sector have to assess environmental tradeoffs in the face of limited resources. LCA is a great tool for assessing those tradeoffs and making choices consistent with values. By generating high-quality public data and LCA tools, we provide the underlying data necessary for effective decision-making.

Ben Young