ENGINE MANUFACTURERS ASSOCIATION dba TRUCK & ENGINE MANUFACTURERS ASSOC

EMA represents and advocates for the interest of truck and engine manufacturers and serves as the voice of its member companies on domestic and international public policy, legislative and regulatory issues. EMA works with regulatory agencies, including the U.S. Environmental Protection Agency (EPA), the National Highway Transportation Safety Administration (NHTSA), the California Air Resources Board, international regulatory agencies, and state governments to develop and implement cost-effective and technologically feasible emission, fuel quality, safety, and fuel efficiency regulations. EMA also funds outside science-based research to provide data in support of the above activities.In furtherance of this work, EMA worked extensively with government regulators over the course of 2025 on developing and implementing (i)rules under the Federal Clean Air Act and the Energy Independence and Security Act focused on reducing greenhouse gas emissions and improving fuel efficiency; (ii) rules under the Federal Clean Air Act and the California Clean Air Act implementing further mobile source emission control regulations; and (iii) various NHTSA rules designed to improve the overall safety of heavy-duty commercial vehicles.

EMA sponsors scientific and technical research to improve truck and engine performance and reduce emissions, to develop safety and emissions measurement and test methods, to assure the improvement and compatibility of fuels, and to improve the overall safety and environmental performance of advanced truck and engine technologies.Through research, development, and advocacy, EMA members have successfully worked with government and regulatory agencies over the past 50 years to significantly reduce emissions and improve overall performance from internal combustion engines.