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Project Status: complete

Title: Collection of evaporative emissions data from off-road equipment.

Principal Investigator / Author(s): Dennis McClement

Contractor: Automotive Testing Laboratories

Contract Number: 00-315

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


The purpose of this study was to collect evaporative emissions data on a variety of in-use gasoline-powered off-road equipment. Significant changes in evaporative emissions measurement procedures were implemented for on-road mobile sources in the 1990s. Before this study, only limited data had been gathered on off-road equipment using the new superior methods. The off-road gasoline powered equipment category encompasses a wide variety of different types. The categories included in this study were Lawn and Garden, Marine Recreational, Off-Road Recreational, and Light Commercial. The primary test fuel was summer grade commercial California Phase II reformulated gasoline purchased in early summer of 2001. Testing included Hot Soak, Diurnal, Running Loss, and Refueling emission measurements. Data was collected continuously throughout each test. The continuous data was provided to ARB staff in electronic format. The results of this program are to be used by ARB to validate and improve the emissions factor model OFFROAD, which includes this class of equipment.


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

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