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Low-carbon technology pathways for soot-free urban bus fleets in 20 megacities

Urban transit bus fleets are a significant source of air pollutant emissions, including black carbon, a harmful ultrafine particle and potent short-lived climate pollutant. Transit bus fleets are...
Published 2017.08.31: Publication

Impacts and mitigation of excess diesel NOx emissions in 11 major vehicle markets

A new study published online May 15 in the journal Nature quantifies the global health and environmental burden of real-world diesel NOx emissions in 11 major vehicle markets. The study found that...
Published 2017.05.22: Event

Impacts and mitigation of excess diesel NOx emissions in 11 major vehicle markets

Access publication here: Nature, 25 May 2017, doi:10.1038/nature22086 Nitrogen oxide (NOx) emissions from diesel cars, trucks, and buses are a major contributor to air pollution-related deaths...
Published 2017.05.15: Publication

Impacts of world class vehicle efficiency and emissions regulations in select G20 countries

In 2014, the G20 Energy Efficiency Action Plan prioritized the establishment of a Transport Task Group (TTG) to promote cooperation among participating G20 countries to develop domestic policies that...
Published 2017.01.25: Publication

Technology pathways for diesel engines used in non-road vehicles and equipment

Internal combustion engines are ubiquitous in today’s society. Applications for these engines cover a broad spectrum, ranging from vehicles that transport passengers and move goods to specialized...
Published 2016.09.16: Publication

Opel's admissions of defeat device calibrations

A little while ago I blogged about the widespread practice by automakers in the EU of reducing nitrogen oxide (NOx) emission controls at ambient temperatures below 10 °C–17 °C and after a hot restart...Opel admits to reducing vehicle emission controls based on conditions other than ambient temperature or restart. Opel says its “engines are in compliance” in Europe. But, once again, they would not...
Published 2016.06.15: Blog Post

Policies to reduce fuel consumption, air pollution, and carbon emissions from vehicles in G20 nations

The transport sector consumes more than half of global oil production, and releases nearly a quarter of all anthropogenic carbon dioxide emissions. Motor vehicles and engines contribute to ambient...
Published 2015.06.08: Publication

Air pollution from marine vessels in the U.S. High Arctic in 2025

Marine vessels are a significant source of greenhouse gas and air pollutant emissions, including CO2, NOX, SOX, particulate matter, and black carbon, which impact local air quality, human health, and...
Published 2015.01.30: Publication

CCAC Green Freight Call to Action

The High Level Assembly of the Climate and Clean Air Coalition to Reduce Short-Lived Climate Pollutants (CCAC) met in Warsaw on November 21, one of the events during the recently concluded COP19....
Published 2013.12.05: News

Tightening vehicle and fuels standards to benefit global health and climate

Study finds that more stringent standards worldwide could dramatically reduce premature mortality while cutting short-lived climate pollutant emissions as much as 80%. Download the report [.pdf]...
Published 2013.11.12: News

Arctic sea shipping: Emissions matter more than you might think

Not so long ago, explorers risked their lives and the lives of their crews in search of the fabled Northwest Passage. Now the question is no longer if a route through the Arctic exists but how many...More vessels plying Arctic shipping routes may reduce long-lived GHG emissions only to increase emissions of short-lived climate pollutants in an already delicate environment.
Published 2013.10.02: Blog Post

Upstream climate impacts of R-134a and R-1234yf

All common refrigerants used in air conditioning and refrigeration systems in vehicles today are potent greenhouse gases (one kilogram of the common refrigerant R-134a is equivalent to 1430 kg of CO2...
Published 2013.09.09: Publication

What might US-China collaboration on clean fuels and vehicles focus on?

My colleague Nic Lutsey recently blogged about a new development in US-China climate collaboration: a focus on improving the efficiency of heavy-duty trucks. Trucks are a large and growing...The US-China Climate Change Working Group also has great potential to deliver direct health benefits beyond its climate change mitigation impact.
Published 2013.08.02: Blog Post

Low-sulfur gasoline and diesel: The key to lower vehicle emissions

It is impossible to reduce air pollution from the transportation sector without getting sulfur out of fuels. Sulfur is a pollutant itself, but more importantly it interferes with and eventually...
Published 2003.05.30: Publication