—Aerosol Origins “Other source of secondary organic aerosols is proposed” ATMOSPHERIC CHEMISTRY models have long underestimated the actual levels of organic aerosols in the air, in some cases by a factor of 10. Now, researchers at Carnegie Mellon University believe that the gap in the models involves oxidation of hydrocarbon emissions into potentially hazardous secondary organic aerosols (Science 2007, 315, 1259). Fine particulate matter in the atmosphere is composed of sulfates, primary organic aerosols such as hydrocarbons from exhaust pipes, and secondary organic aerosols (SOAs), which are more highly oxidized species. Identifying a missing source of SOAs is more than just bookkeeping, comments Paul J. Ziemann, an atmospheric chemist at the University of California, Riverside.
by Sarah Everts |
March 05, 2007