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Project at a Glance

Project Status: complete

Title: Measurements of organic acids in the South Coast Air Basin.

Principal Investigator / Author(s): Grosjean, Daniel

Contractor: Daniel Grosjean and Associates, Inc.

Contract Number: A5-177-32

Research Program Area: Atmospheric Processes

Topic Areas: Acid Deposition


Much of the research and regulatory efforts concerning acid deposition in California and elsewhere have focused in the past on the strong inorganic acids, sulfuric and nitric; organic acids have received much less attention. The main objective of this project was to contribute measurements that would augment the data base from which the role of organic acids in urban pollution and acid deposition could be better assessed. The major components of this project included (a) the development of cost-effective measurement methods for airborne acids, (b) the application of these methods to intensive measurements carried out at a California South Coast Air Basin smog receptor site, Glendora and closely coordinated with the ARB-sponsored Carbon Species Methods Comparison Study (CSMCS), and (c) data interpretation with emphasis on ambient levels, diurnal variations, phase distribution, emissions, formation and removal of organic acids in urban air. In addition, the relative abundance of organic and inorganic acids was determined for the first time from simultaneous measurements carried out at the Glendora study.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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