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ARB has submitted a request to the US EPA for authorization of
the in-use off-road diesel vehicle regulation. On August 12,
2008, the Air Resources Board submitted to the U.S.
Environmental Protection Agency a Request for Authorization
Determination pursuant to Clean Air Act Section 209(e) for
California's In-Use Off-Road Diesel Vehicle Regulation.  The
Request for Authorization and supporting documentation can be
found at:
http://www.arb.ca.gov/msprog/ordiesel/ordiesel.htm

The final rulemaking package was approved by the Office of
Administrative Law and filed with the Secretary of the State on
May 16, 2008. It became operative on June 15, 2008.  Once U.S.
EPA grants authorization, ARB will be able to enforce all
aspects of the off-road regulation.