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Inspection & Maintenance (I/M)

Best Practices

Vehicle inspection and maintenance programs (I/M) help improve air quality by identifying high-emitting vehicles in need of repair (through visual inspection, emissions testing, and/or the downloading of fault codes from a vehicle's onboard computer) and causing them to be fixed as a prerequisite to vehicle registration within a given non-attainment area.  The 1990 Amendments to the Clean Air Act made I/M mandatory for several areas across the country, based upon various criteria, such as air quality classification, population, and/or geographic location.

Regulations	Policy Guidance	On-board Diagnostics	Technical Guidance & Test Procedures
Tampering and Warranty	State Status	Federal Facilities	Evaporative Emissions
Remote Sensing	Program Evaluations	Clean Fuel Fleets	Archive: Older Files & Publications

Contact:  Dave Sosnowski, phone: (734) 214-4823, email:  dave.sosnowski@epa.gov

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