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HEI typically receives balanced funding from U.S. Environmental Protection Agency and the worldwide motor vehicle industry. In addition, other public and private organizations in the United States and around the world support special projects or research programs.

U.S. Environmental Protection Agency
  • Office of Research and Development
    • National Center for Environmental Research
    • National Health and Environmental Effects Research Laboratory
    • National Center for Environmental Assessment
  • Office of Air and Radiation
    • Office of Air Quality and Planning Standards
    • Office of Transportation and Air Quality
    • Office of Atmospheric Programs
    • Office of Radiation and Indoor Air
  • Office of International Affairs
Motor Vehicle Industry
  • BMW of North America, LLC
  • Caterpillar, Inc.
  • Chrysler, LLC
  • Cummins Engine Company
  • Daimler AG
  • Detroit Diesel Corporation
  • Ford Motor Company
  • General Motors Corporation
  • Hino Motors, Ltd.
  • American Honda Motor Company, Inc.
  • Hyundai America Technical Center, Inc.
  • Isuzu Motors, Ltd.
  • Jaguar Land Rover North America, LLC
  • KIA Motors America, Inc.
  • Mazda Motor Corporation
  • Mitsubishi Motors Corporation
  • Navistar
  • Nissan Motor Company, Ltd. 
  • Subaru Research and Development, Inc.
  • Toyota Motor Corporation
  • Volkswagen of America, Inc.
  • Volvo Cars of North America, LLC
  • Volvo Powertrain North America
Other Sponsors
  • Claude Worthington Benedum Foundation
  • Exxon Mobil
  • William and Flora Hewlett Foundation
  • Henry L. Hillman Foundation
  • John Deere and Company
  • Richard King Mellon Foundation
  • Oak Foundation
  • PACCAR, Inc.
  • Henry C. and Belle Doyle McEldowney Fund of The Pittsburgh Foundation