Gasoline worse than diesel when it comes to some types of air pollution: study

Mar 02, 2012

The exhaust fumes from gasoline vehicles contribute more to the production of a specific type of air pollution-secondary organic aerosols (SOA)-than those from diesel vehicles, according to a new study by scientists from the Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA's Earth System Research Laboratory (ESRL) and other colleagues.

"The surprising result we found was that it wasn't diesel engines that were contributing the most to the in LA," said CIRES research scientist Roya Bahreini, who led the study and also works at NOAA's ESRL. "This was contrary to what the scientific community expected."

SOAs are that are formed in air and make up typically 40 percent to 60 percent of the aerosol mass in . This is important because fine-particle pollution can cause , such as heart or respiratory problems.

Due to the harmful nature of these particles and the fact that they can also impact the climate and can reduce visibility, scientists want to understand how they form, Bahreini said. Researchers had already established that SOAs could be formed from gases released by gasoline engines, diesel engines, and natural sources-biogenic agents from plants and trees-but they had not determined which of these sources were the most important, she said. "We needed to do the study in a location where we could separate the contribution from vehicles from that of natural emissions from vegetation," Bahreini said.

Los Angeles proved to be an ideal location. Flanked by an ocean on one side and by mountains to the north and the east, it is, in terms of , relatively isolated, Bahreini said. At this location, the scientists made three weekday and three weekend flights with the NOAA P3 , which hosted an arsenal of instruments designed to measure different aspects of . "Each instrument tells a story about one piece of the puzzle," she said. "Where do the particles come from? How are they different from weekday to weekend, and are the sources of vehicle emissions different from weekday to weekend?" she said.

From their measurements, the scientists were able to confirm, as expected, that diesel trucks were used less during weekends, while the use of gasoline vehicles remained nearly constant throughout the week. The team then expected that the weekend levels of SOAs would take a dive from their weekday levels, Bahreini said.

But that was not what they found.

Instead the levels of the SOA particles remained relatively unchanged from their weekday levels. Because the scientists knew that the only two sources for SOA production in this location were gasoline and diesel fumes, the study's result pointed directly to gasoline as the key source.

"The contribution of diesel to SOA is almost negligible," Bahreini said. "Even being conservative, we could deduce from our results that the maximum upper limit of contribution to SOA would be 20 percent."

That leaves gasoline contributing the other 80 percent or more of the SOA, Bahreini said. The finding will be published in Geophysical Research Letters, a journal of the American Geophysical Union. "While emit other pollutants such as soot and nitrogen oxides, for organic aerosol pollution they are not the primary culprit," Bahreini said.

If the scientists were to apply their findings from the LA study to the rest of the world, a decrease in the emission of organic species from gasoline engines may significantly reduce SOA concentrations on a global scale as well. This suggests future research aimed at understanding ways to reduce gasoline emissions would be valuable.

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More information: dx.doi.org/10.1029/2011GL050718

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User comments : 3

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Shootist
1.6 / 5 (7) Mar 02, 2012
Gasoline worse than diesel when it comes to some types of air pollution: study


Neither is bad with when managed by an EMS and connected to the proper plumbing.
eachus
2.5 / 5 (4) Mar 03, 2012
An excellent example of cum hoc ergo propter hoc (Latin for "with this, therefore because of this.") I am not saying that the conclusion is false, just that it was reached via a fallacy well known to statisticians.

Yes, the paper did try to generate histories for specific air masses, rather than relying on gross overall measurements. But the net result is still the same. The SOA levels do not drop on weekends. One possible reason is that SOAs are not generated by diesel engines. But we know from laboratory experiments that diesel engines do create SOAs.

What other conclusion is possible? How about this. 1) Not all trucks use diesel engines. 2) Almost all long-haul trucks use diesel engines. 3) Maybe the reduction in truck traffic on weekends is due to a reduction in the number of (gasoline powered) short-haul delivery vehicles.

(Note that this message and the experiment are a microcosm of how real science works. Someone proposes a theory and others try to falsify it.)
deepsand
4 / 5 (8) Mar 03, 2012
Eachus, the article does not say that the reduced use of diesel engines was deduced from SOA levels, but was independently observed.

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