The U.S. Environmental Protection Agency's (EPA) new I/M vehicle emissions-test rules, which took effect Aug. 23, provide states with additional flexibility for I/M programs. Notable among the changes are equal credits for vehicle emissions testing at private repair shops (termed “decentralized testing”) and test-only stations (centralized). In effect, a U.S. Court of Appeals (for the District of Columbia) ruling of May 6, 1994 — sought jointly by the U.S. EPA and Envirotest Systems ...

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