Gasoline emissions dominate over diesel in formation of secondary organic aerosol mass (Roya Bahreini, Ann M. Middlebrook, Joost A de Gouw, Carsten Warneke, Michael K. Trainer, Charles A. Brock, Harald Stark, Steven S. S Brown, William P. P Dube, Jessica B. Gilman, katharine Hall, John S. S. Holloway, William C. Kuster, Anne E. Perring, Andre S.H. Prevot, Joshua Peter Schwarz, J. Ryan Spackman, Soenke Szidat, Nicolas L. Wagner, Rodney J. Weber, Peter Zotter, David D. D. Parrish, Abstract, Geophysical Research Letters, Feb. 26, 2012)
Also discussed here: Gasoline Worse Than Diesel When It Comes to Some Types of Air Pollution (Science Daily, Mar. 2, 2012)
Today, we review some research from Los Angeles that examines the contribution of diesel emissions to the formation of secondary organic aerosols (SOA), tiny particles that make up most of the aerosol component of urban air pollution and highly harmful to health. The authors concluded that diesels contribute next to nothing to the SOA. The result is that even greater attention has to be paid to reducing gasoline emissions, previously thought to be less serious a health threat than diesel emissions.
Key Quotes:
“organic compounds in both gasoline fuel and diesel engine exhaust can form secondary organic aerosol (SOA), the fractional contribution from gasoline and diesel exhaust emissions to ambient SOA in urban environments”
“Diesel emissions in the LA Basin vary between weekdays and weekends, with 54% lower diesel emissions on weekends. Despite this difference in source contributions, in air masses with similar degrees of photochemical processing, formation of OA is the same on weekends and weekdays”
“the contribution from diesel emissions to SOA formation is zero within our uncertainties”
"The surprising result we found was that it wasn't diesel engines that were contributing the most to the organic aerosols in LA"
Related articles
- Study finds gasoline exhaust contributes more to formation of secondary organic aerosols than diesel (greencarcongress.com)
- AGU: Gasoline worse than diesel when it comes to some types of air pollution (junkscience.com)
- Gas Engines May Be Dirtier Than Diesels in One Respect (nlm.nih.gov)
- Gasoline Versus Diesel Oil for Organic Aerosols (cleantechies.com)
- Gas Engines May Be Dirtier Than Diesels in One Respect (news.health.com)
- Gasoline worse than diesel when it comes to some types of air pollution: study (physorg.com)
- AGU: Gasoline worse than diesel when it comes to some types of air pollution (eurekalert.org)
- Characterization Of Winter Organic Aerosols In Beijing, China (medicalnewstoday.com)
- Climatic effects of 1950-2050 changes in US anthropogenic aerosols - Part 1: Aerosol trends... (pubs.giss.nasa.gov)
- The Arrival of Clean Diesel (blogher.com)
- Atmospheric Aerosols and the Death of Nature (worldclimatereport.com)
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