Air pollution study clears the air on diesel versus gas emissions

Oct 22, 2012 by Sarah Yang
Air pollution study clears the air on diesel versus gas emissions
Diesel exhaust contributes more to a component of smog than gasoline-fueled cars, according to a new UC Berkeley study.

(Phys.org)—Are gasoline-fueled cars or large diesel trucks the bigger source of secondary organic aerosol (SOA), a major component of smog? UC Berkeley researchers have stepped into this debate with a new study that says diesel exhaust contributes 15 times more than gas emissions per liter of fuel burned.

The study, published today in the , elucidates the contributions to air pollution from the two types of fuel emissions. The authors estimate that diesel exhaust is responsible for 65-90 percent of a region's vehicular-derived SOA, depending upon the relative amounts of gasoline and diesel used in the area.

For example, the researchers noted that in the San Francisco Bay Area, about 10 times more gas is used compared with diesel.  

SOA contributes to respiratory problems and , so pinpointing the major sources of the pollutant is important in evaluating current and future policies to reduce smog in the state.

The new findings contradict previous research that put the blame on gasoline-fueled vehicles as the predominant source of precursors that form secondary organic aerosol.

"We can now say that, while both motor vehicle sources are important for these 'secondary' particles, diesel is responsible for a larger portion, especially in regions such as the with a lot of diesel use," said study principal investigator and professor Allen Goldstein, who has joint appointments in the Department of Environmental Science, Policy and Management and the Department of Civil and Environmental Engineering.

For this study, Goldstein, who also is a faculty chemist at the Lawrence Berkeley National Laboratory, teamed up with Robert Harley, professor of civil and environmental engineering, and an expert on and air quality.

The findings stand out because the researchers were able to tease out the chemical composition of

"The data from our study contains the most comprehensive chemical detail to date on diesel and gasoline emissions," said study lead author Drew Gentner, a recent UC Berkeley Ph.D. graduate in civil and environmental engineering. "This presents many opportunities to assess the chemistry of these compounds in the atmosphere and the impacts of these sources. We expect that these findings will help policymakers improve air pollution control measures in the state, and also other parts of the world."

Explore further: Big data confirms climate extremes are here to stay

More information: "Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions," by Drew R. Gentner et al. PNAS, 2012.

Related Stories

EPA mandates ultra-low-sulfur diesel fuel

Jun 05, 2006

The Environmental Agency has quietly issued a rule requiring U.S. oil refineries to produce ultra-low-sulfur diesel fuel to substantially reduce emissions.

Recommended for you

Big data confirms climate extremes are here to stay

17 hours ago

In a paper published online today in the journal Scientific Reports, published by Nature, Northeastern researchers Evan Kodra and Auroop Ganguly found that while global temperature is indeed increasing, so too is the variab ...

Peru's carbon quantified: Economic and conservation boon

17 hours ago

Today scientists unveiled the first high-resolution map of the carbon stocks stored on land throughout the entire country of Perú. The new and improved methodology used to make the map marks a sea change ...

How might climate change affect our food supply?

18 hours ago

It's no easy question to answer, but prudence demands that we try. Thus, Microsoft and the United States Department of Agriculture (USDA) have teamed up to tackle "food resilience," one of several themes ...

Groundwater is safe in potential N.Y. fracking area

18 hours ago

Two Cornell hydrologists have completed a thorough groundwater examination of drinking water in a potential hydraulic fracturing area in New York's Southern Tier. They determined that drinking water in potable ...

User comments : 0