§ 51.352 Basic I/M performance standard.

(a) Basic I/M programs shall be designed and implemented to meet or exceed a minimum performance standard, which is expressed as emission levels achieved from highway mobile sources as a result of the program. The performance standard shall be established using the following model I/M program inputs and local characteristics, such as vehicle mix and local fuel controls. Similarly, the emission reduction benefits of the State's program design shall be estimated using the most current version of the EPA mobile source emission model, and shall meet the minimum performance standard both in operation and for SIP approval.

(1) Network type. Centralized testing.

(2) Start date. For areas with existing I/M programs, 1983. For areas newly subject, 1994.

(3) Test frequency. Annual testing.

(4) Model year coverage. Testing of 1968 and later model year vehicles.

(5) Vehicle type coverage. Light duty vehicles.

(6) Exhaust emission test type. Idle test.

(7) Emission standards. No weaker than specified in 40 CFR part 85, subpart W.

(8) Emission control device inspections. None.

(9) Stringency. A 20% emission test failure rate among pre-1981 model year vehicles.

(10) Waiver rate. A 0% waiver rate.