Research Projects

Project at a Glance

Project Status: complete

Report Published February 1977:

Title: Mobile source emission inventory system for light duty vehicles in the South Coast Air Basin.

Principal Investigator / Author(s): Goodman, H. S.

Contractor: TRW, Enviromental Engineering Division

Contract Number: 4-1236


Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


Abstract:

This report presents the development of a mobile source emission inventory system for light duty vehicles in the South Coast Air Basin.

The development of a mobile source emission inventory system for light duty vehicles consisted of compiling a vehicle and driving data base for the South Coast Air Basin (SCAB) and implementing a methodology to estimate emissions with the degree of spatial and temporal resolution necessary for the proposed usage of the system.

The procedure used in developing the inventory system consists of obtaining vehicle miles traveled (VMT) for particular locations (grid square, emission freeway segment, etc.) and time periods and combining them with an factor obtained from the emission model.

The computerized emissions model produces emissions estimates for the South Coast Air Basin with 10 km grid spatial resolution and one hour temporal resolution. The model structure is basically independent of the spatial and temporal resolution chosen. The methodology developed involves dividing the SCAB into regions exhibiting similar driving patterns and then combining traffic model data and actual traffic count data to construct the VMT data base. The derivation of emission factors considered road type, average speed, temperature, vehicle model year distribution and hot/cold vehicle operation mix.

The system was demonstrated for a 1975 mobile emissions inventory for light duty vehicles in the South Coast Air Basin.

The report was submitted in fulfillment of Contract Number ARB 4-1236 by TRW Environmental Engineering Division under sponsorship of the California Air Resources Board. Work was completed as of September 30, 1976.


 

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