Research Projects

New Search

Project at a Glance

Project Status: complete

Title: Evaluation of emissions from selected uninventoried sources in the state of California

Principal Investigator / Author(s): Dickson, Ronald J.

Contractor: Radian Corporation

Contract Number: A5-147-32

Research Program Area: Emissions Monitoring & Control

Topic Areas: Stationary Sources


The California Air Resources Board, with the assistance of local and regional air pollution control districts, maintains an extensive statewide emission inventory of criteria pollutants. This document ranks the emissions from 47 emission source categories that are not currently inventoried. A primary objective of this study was to evaluate the significance of these uninventoried sources. A second objective was to develop methodologies for refining and spatially disaggregating emission estimates from the significant source categories. Source categories emitting volatile organic compounds were the primary focus of this study. Sources of ammonia (manure wastes) and particulate matter (wind-blown dust) were also considered.

The project was conducted in two phases. In the first phase, preliminary emission calculations for the 47 source categories were prepared. A ranking process was then developed and used to rank each emission source category considered. The results of the first phase are documented in an interim report.

The second phase of this project, presented in this document, focused on eight source categories that were selected from the ranking process. For these eight source categories, methods for refining and spatially desegregating the preliminary emission estimates were developed. A detailed methodology for calculating statistical confidence intervals for the refined emission estimates was also developed and applied.


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

Stay involved, sign up with ARB's Research Email Listserver