This page last reviewed October 29, 2007.

Given the wide range of engine families within the fleet, the multitude of applications, and the various emission control systems possible, it was necessary that ARB establish a multi-level verification process for the retrofit program. There are three verification levels for PM emission control strategies and only systems expected to reduce PM emissions by at least 25%, or to achieve PM levels of 0.01 g/bhp-hr will be considered for ARB's verification approval. Although not a requirement at this time if a diesel emission control strategy also reduces NOx emissions by at least 15%, this will be included in the verification.

Verification Classifications for Diesel Emission Control Strategies

Optional Verification for NOx Reductions

Information on Currently Verified Technologies is posted as it becomes available. Please check this website periodically for the most current information.

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