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Project at a Glance

Project Status: complete

Report Published May 1985:

Title: Improvement of the emission inventory for reactive organic gases and oxides of nitrogen in the South Coast Air Basin.

Principal Investigator / Author(s): Oliver, William R.

Contractor: Systems Applications, Inc.

Contract Number: A2-076-32

Research Program Area: Atmospheric Processes


The purpose of this study was to improve the quality of the 1979 South Coast Air Basin emission inventory for reactive organic gases and nitrogen oxides. To address this effort, Systems Applications, Inc. as prime contractor, joined with Radian Corporation as subcontractor, to utilize the strengths of each firm in the areas of emission inventory development management. The technicalapproach of this study team included (1) a review of existing inventory data to identify emission source categories and reactive species most likely to cause uncertainty in predicted photochemical ozone concentrations; (2) a field survey and testing program that provided basic data andinformation for revising the 1979 inventory; and (3) the generation of an improved ROG and NOx inventory for the SOCAB that was compatible with the modeling emission data format. Statistical methods were applied selecting representative facilities for the field survey and testing program. Quality control was practiced throughout the project, particularly with regard to data handling and emission testing. Changes to the inventory were within the overall estimated variation for typical inventory of TOG and NOx emissions was found to be a reasonably accurate representation of the actual basin-wide inventory. Significant changes to both individual source and source category emissions and to ROG speciation were made during the study. The most significant change to the inventory was the addition of new speciation profiles for TOG emissions which resulted in important changes to organic gas reactivity. Twelve recommendations for guiding future activities in the area of emission inventory development are presented in the report.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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