06/10/04: The Air Resources Board (ARB) announces a Memorandum of Agreement (MOA) with the Environmental Protection Agency's (EPA's) Voluntary Diesel Retrofit Program for the Coordination of Diesel Retrofit Verification. This MOA establishes reciprocity in verifications of hardware or device-based retrofits. It further establishes ARB's and EPA's commitment to cooperate on the evaluation of other retrofit technologies, including fuel-based strategies. The agreement commits ARB and EPA to work toward accepting particulate matter (PM) and oxides of nitrogen (NOx) verification levels assigned by the other's verification programs. Additionally, as retrofit manufacturers initiate and conduct in-use testing, ARB and EPA agree to coordinate this testing so data generated may satisfy the requirements of each program. This MOA is intended to expedite the verification and introduction of innovative emission reduction technologies. Additionally, this MOA should reduce the effort needed for retrofit technology manufacturers to complete verification. In the near future ARB and EPA will provide further guidance on how this agreement will be implemented.