Our industry employs over 65,000 bright people who design and manufacture efficient technology.


The best clean tech is priced within reach. Really. Less than the audio system in most cars.



Our clean tech will get cleaner this year, just as it has every year for more than four decades.


Technology has to perform effectively at every stage to consistently succeed. Ours does.


Advanced Engine Systems Institute is a trade association of highly focused manufacturers. We help move the nation forward by designing, engineering and producing technologies to optimize and reduce pollution from internal combustion engine systems. Our industry has 62 companies with 323 facilities in 39 states maintaining America’s global leadership.

Energy Car

What We Do

AESI is focused on educating and communicating with key policymakers regarding the enormous economic and health benefits created by our industry to date – as well as the potential to expand on these accomplishments in the future through research and innovation.

The industry faces many challenges to the programs and regulations that drive our market. Those challenges threaten to stagnate or erode market opportunities and turn back the clock on years of steady progress in improving air quality and reducing the pollution footprint of each vehicle.

We help move the nation forward by designing, engineering and producing technologies, in collaboration with our customers, that optimize and reduce pollution from internal combustion engine systems.

We provide our members with information, and communicate with their customers, regarding political and policy trends shaping today’s and future market opportunities for vehicle efficiency and emission control technologies.

National Ozone Standard

The Clean Air Act requires the US EPA to review and revise the National Ambient Air Quality Standards (NAAQS) as necessary to protect public health, the national ambient air quality standard for ozone. Ozone is formed through the interaction of nitrogen oxides, and volatile organic compounds in the presence of sunlight in the atmosphere. States are now in the process of implementing the most recent standard (70 parts per billion) set on October 1, 2015.


Ozone NAAQS Comments
submitted to EPA


The Case of
NOx and Ozone


for Ozone


Heavy-Duty Vehicle NOx

The US EPA’s 2007/2010 rule setting Heavy-Duty (HD) Vehicle and Engine and Fuel Standards required a significant reduction in nitrogen oxides (NOx) emissions from trucks and buses. California has requested that the US EPA further reduce those standards’ levels by an additional 90% to help expedite attainment of the ozone NAAQS.
AESI works closely with the Air Resources Board (ARB) and the Ozone Transport Commission (OTC) on modeling ozone impacts from HD NOx emissions reductions. Comments have been submitted on the proposed rule and presented to the ARB on the issue.


ARB’s Mobile Source
Strategy Comments


ARB Technology Symposium Emerging HD Technologies


The Role of Emerging HD Technologies in Achieving CA’s Emission Reduction Goals


Heavy-Duty Phase 2 Vehicle GHGs

The US ’s 2011 rule on Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles required these vehicles to reduce carbon dioxide emissions for the first time for model years 2014-2018. EPA has proposed further reductions for these vehicles and engines starting in 2021 through 2027.


Letter to EPA Administrator Wheeler urging withdrawal of glider loophole 

HD Phase 2 Proposed Rule Comments


MECA Phase 2 Special Report


Mid-term Review – Light–Duty Vehicle GHGs

As part of the 2017-2025 light-duty vehicle greenhouse standards rulemaking, EPA made a regulatory commitment to conduct, in coordination with NHTSA and the California Air Resources Board, a Midterm Evaluation of the longer-term standards for model years 2022-2025. That technology assessment is now underway.

Press Release: Auto Suppliers, Emission Control Companies Want Coordination by All Agencies

Advanced Technologies Flexibility Option for Model Year 2022-2025 GHG/CAFE Standards 

California Auto Deal Helps Protect Essential Industry Jobs

Comments by AESI to EPA Proposed Rule 9-27-2021


Cost, Effectiveness and
Deployment of Fuel Economy
Technologies for Light-Duty Vehicles

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EPA’s draft
Technical Assessment Report (TAR) 2
Special Report

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Past Issues


The final Tier 3 rule takes a comprehensive approach, considering the vehicle and its fuel as an integrated system, aimed at addressing the impacts of motor vehicles on air quality and public health. The program sets new vehicle emissions standards and lowers the sulfur content of gasoline beginning in 2017. These standards will reduce both tailpipe and evaporative emissions from passenger cars, light-duty trucks, medium-duty passenger vehicles, and some heavy-duty vehicles. Removing more sulfur from gasoline allows vehicles’ catalysts to work more efficiently and will facilitate the development of some lower-cost technologies to improve fuel economy, reducing gasoline consumption and saving consumers money. -EPA


In September 2015, the US EPA determined that Volkswagen had manufactured and installed defeat devices in diesel light-duty vehicles with 2.0 liter engines and had violated Clean Air Act emission standards.  In late June 2016, in related settlements with the United States and the State of California, and separately with the U.S. Federal Trade Commission (FTC), Volkswagen agreed to spend up to $14.7 billion to settle allegations of cheating emissions tests and deceiving customers. Volkswagen will offer consumers a buyback and lease termination for nearly 500,000 model year 2009-2015 2.0 liter diesel vehicles sold or leased in the U.S., and spend up to $10.03 billion to compensate consumers under the program. In addition, the companies will spend $4.7 billion to mitigate the pollution from these cars and invest in green vehicle technology.  AESI will continue closely following developments on this issue and how it will affect the emissions control manufacturing industry.

VW Notice of Violation


Automotive Technology Leadership Group Statement of Principles

For Immediate Release: Major U.S. employers want to prevent market uncertainty that discourages research and
investment, and risks U.S. market leadership in clean transportation

Business Leaders are Talking.

There is broad support for Tier 3

“EPA’s Tier 3 rule will provide a significant opportunity to further reduce emissions from the light-duty vehicle fleet by utilizing an integrated systems approach that combines advanced emission control technologies with advanced engine designs and very low sulfur gasoline fuel. In addition, these advanced emission control technologies will enable all current and future high-efficiency vehicle powertrains to be viable options for complying with EPA’s greenhouse gas pollutant standards,” said MECA’s executive director, Joseph Kubsh. “MECA congratulates the agency for all of its hard work in getting this rule finalized and for its continued efforts in helping to achieve the goal of cleaner air for all Americans. Our industry is prepared to do its part to deliver cost-effective, advanced emission control technologies to the marketplace.”
Joe Kubsh, Executive Director, Manufacturers of Emission Controls Association (MECA)
“Our members and their employees are pleased that the USEPA has issued a final Tier 3 rule to further reduce sulfur in fuels and enable use of the most advanced clean car technologies. This action gives important clarity to our industry so we can act on long-planned manufacturing investments which will secure America’s continued global leadership in this field. We fully expect that new standards will contribute greatly and quickly to better air quality in communities across the country at very low cost.”
Chris Miller, former Executive Director, Advanced Engine Systems Institute (AESI)
“Umicore compliments the EPA for its forward thinking in establishing the Tier 3 emission control regulations. This regulation, which covers a ten year vehicle model design basis as well as harmonizing with California LEVIII, will solidify our company’s long term investment and product development strategies to meet the market demands for these vehicles. In addition it will stabilize our workforce for the present and create future highly skilled jobs in research, engineering and manufacturing.
The reduced sulfur level with allow us to develop new catalyst technologies to meet various engine operating designs and also improve the performance of the current fleet.”
Ken Zerafa, President, Umicore Autocat USA, Inc.
“Despite popular mis-conceptions, air pollution from motor vehicles is still a serious threat both to the environment and to our health. Lev 3 regulations are an important step towards improving air quality in the numerous areas of the United States that don’t currently meet the air quality standards set forth by the Clean Air Act. Protecting the environment is an on-going commitment that we can’t allow to fade into the shadows. Although some may view emissions legislation as having a negative impact on the economy, quite the opposite is true. The jobs created by emissions control technology as well as the health care costs avoided by a clean environment more than compensate for the incremental costs associated with manufacturing cleaner products. Additionally, healthy people are more productive!”
Titus Iwaszkiewicz, President, Emitec Inc.


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The industry faces many challenges to the programs and regulations that drive our market. Those challenges threaten to stagnate or erode market opportunities and turn back the clock on years of steady progress in improving air quality and reducing the pollution footprint of each vehicle.