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Project at a Glance

Title: Mandatory vehicle emission inspection and maintenance

Principal Investigator / Author(s): Norman, E. J.

Contractor: Northrop Corporation

Contract Number: ARB-1522

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


The Vehicle Emission Inspection and Maintenance Study, as contracted by the State of California Air Resources Board, is divided into two distinct but interrelated areas of study. Part A will investigate and determine the technical and economic feasibility of instituting a mandatory program for emission testing and related corrective maintenance. Part B of the study will obtain operational data necessary to determine the respective costs and benefits of four test regimes in reducing pollutants when they are utilized in conjunction with corrective maintenance Included in this latter pilot study is a learning phase during which a representative sample of 120 vehicles is subjected to various testing and maintenance activities. A description of the functions performed and findings relative to this initial phase of the investigation is documented. Additionally, recommended modifications that affect the subsequent test phase involving the 1200-vehicle sample are discussed.


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

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