programs / Passenger Vehicles


The reductions in passenger vehicle emissions that have been achieved since the mid-twentieth century are a great environmental success story. Government regulation of tailpipe emissions and private investments in breakthrough technologies such as the three-way catalytic converter have reduced emissions of nitrogen oxides, carbon monoxide, and hydrocarbons by 75 to 90 percent at a relatively small cost to consumers. Since California first established emission standards for passenger vehicles in the 1960s, different regulatory approaches have been adopted by the United States, Japan, and Europe, and each has been emulated to some degree in other parts of the world. Significant work remains to replicate these successes throughout the rest of the global fleet.

The massive impact of passenger vehicles on climate also remains to be addressed. The transportation sector is responsible for about one-quarter of energy-related greenhouse gas emissions worldwide. Passenger vehicles account for just under half of this total, and will remain the predominant source of these emissions for the foreseeable future.

Featured Work



Recently Released

Proposed Saudi Arabia CAFE standard for new LDVs 2016-2020
The proposed standards, which apply to all new and used passenger vehicles and light trucks, will phase in from 2016 through 2020. The standards for new vehicles are patterned after the U.S. CAFE structure and follow the 2012–...
Policy update
Road transport in the EU Emissions Trading System: An engineering perspective
Assesses the effect on technology innovation and deployment if mandatory CO2 standards in the EU were replaced by including road transport in the EU Emissions Trading System, as some have recently proposed.
Working paper
Development of test cycle conversion factors among worldwide light-duty vehicle CO2 emission standards
Compares dynamics of the most important driving cycles and their impacts on fuel consumption and CO2 emissions to produce an updated set of conversion factors for translating distance-based CO2 emissions among the different...
White paper



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From the ICCT Blogs

More efficient new Ford F150: A shift from the old horsepower wars?
Ford has clearly done something very special technologically. Whether it will be the game-changer many expected in terms of increased efficiency remains unclear.
Staff Blog
Improving the conversions between the various passenger vehicle fuel economy/CO2 emission standards around the world
We've updated our comparison of passenger vehicle fuel-efficiency standards worldwide, improving the test cycle conversion factors used to translate the standard values among the different regulations. Here are the highlights, and links to the full details.
Staff Blog
What cities are leading the charge on electric vehicles?
Kicking off a city-focused project to assess what's going on, what's working, and what could be done better to promote EVs.
Staff Blog

The Staff

Anup Bandivadekar
Anup Bandivadekar
Program Director / India Lead
John German
John German
Senior Fellow / US Co-Lead
Hui He
Hui He
Senior Policy Analyst / China Co-Lead
Fanta Kamakaté
Fanta Kamakaté
Chief Program Officer
Peter Mock
Peter Mock
Europe Managing Director / EU Lead