Project at a Glance

Title: Development of updated ARB solvent cleaning emissions inventories

Principal Investigator / Author(s): Cocker, David R. III

Contractor: University of California, Riverside

Contract Number: 06-322

Research Program Area: Emissions Monitoring & Control

Topic Areas: Stationary Sources, Toxic Air Contaminants


Solvent cleaning is a major source category of volatile organic compound (VOC) emissions in California. The Air Resources Boardís (ARBís) current solvent cleaning and emissions inventories are based on data that no longer reflect current technology and solvents. Under contract with the ARB, the University of California, Riverside conducted a study to update the statewide emissions inventory from this source category. The main objective of the study is to update ARBís solvent cleaning emissions inventory and chemical species profiles. The approach included information collection through surveys and development of emission factors for various equipment/solvent combinations. The emission factors were then combined with current employment data to estimate the statewide emissions inventory.

Methods used to reduce the survey data and develop the emissions inventory are discussed. There were 11 types of equipment, 38 solvents, and 102 different types of businesses identified in the survey. State-level emissions estimates for the current study are 109 tons per day (tpd) of total organic gases (TOG). This is compared with ARBís 2007 inventory estimate of 96 tpd TOG, and the 1993 inventory estimate of 215 tpd TOG. Most notable in the comparisons is a dramatic reduction in the use of chlorinated solvents, which have been replaced to a large extent by alcohols, ketones, and petroleum distillates. The emissions model developed during this project will allow the ARB to develop emissions estimates and allocate them to counties and air districts throughout the state.

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

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