This advisory is to inform owners/operators of engines subject to the Airborne Toxic Control Measure for Diesel Particulate Matter (ATCM) from Portable Engines Rated at 50 Horsepower and Greater that the Air Resources Board (ARB) plans to revise the fleet average emission standards for diesel particulate matter (DPM) that become effective in 2017 and 2020. The Statewide Portable Equipment Registration Program Regulation (PERP regulation) will also be revised to complement any changes made to the ATCM. ARB will not enforce, and is advising the local air districts not to enforce, the 2017 ATCM fleet average emissions standards until the regulatory amendments are effective.

All other PERP regulation and ATCM provisions remain in effect, including current engine eligibility requirements, and provisions requiring all uncertified (Tier 0) equipment to be removed from service no later than January 1, 2017. All local air district permitting requirements for these engines also remain in effect. Please contact the ARB if you have questions regarding these upcoming amendments, and your local air district if you have questions regarding the use of PERP registered engines or equipment units within their jurisdiction.