A Certificate of Conformity is the document that EPA issues to an engine manufacturer to certify that an engine class conforms to EPA requirements. Every class of heavy duty engines/vehicles and non-road engines introduced into commerce in the United States must have a Certificate of Conformity, and they are valid for only one model year of production. The California Air Resources Board issues Executive Orders which are similar in nature, but require submitting separate paperwork, testing information and reporting requirements.

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