Important Upcoming Deadlines in the Recently Implemented ATCM

The purpose of the Airborne Toxic Control Measure (ATCM) is to reduce diesel particulate matter (PM) emission from portable diesel-fueled engines having a rated brake horsepower of 50 and greater (≥ 50 bhp).

Fleet Requirements

  • All fleets are classified into either a small fleet (cumulative horsepower of up to 750) or a large fleet (cumulative horsepower of over 750).
  • Small fleets must follow the tier phase out schedule.
  • Large fleets may either follow the phase out schedule or meet the fleet-average emission rates.
  • Notification by June 30, 2019 is required if the fleet average option is desired. See below for the notification process.
  • No notification is necessary to utilize the tier phase out

The California Air Resources Board (CARB) amended the ATCM due to the inability of fleets to comply with its overly ambitious fleet average targets. As revised, the ATCM’s emission reduction strategies will be achieved through an engine emissions tier phase out as shown in the table below.

Low-Use Designation Deadline

As shown in the table above, Tier 1 engines rated at 750 HP and lower are phased out of permitted operation on January 1, 2020. If you would like to continue operation of an engine of this age and rated horsepower beyond January 1, 2020 the engine can be designated low-use. Low-use designation can be granted to engines that are conditionally limited to 200 hours or less per year. If you want to designate the engine low- use you must do so by July 1, 2019.

Large Fleet Compliance Option Deadline

Large fleets, those with total fleet horsepower over 750, can elect to comply with PM emission fleet average requirements rather than the phase out schedule. In order to do so, all engines, including those with only local air district permits, must be registered in the Statewide Portable Equipment Registration Program (PERP) and the responsible official must submit, in writing, a report listing all of the engines to CARB by June 30, 2019.

The Portable Diesel Engine ATCM does not apply to some portable engines, such as those subject to other diesel rules like the Off-road Diesel, Commercial Harbor Craft and Truck and Bus Regulations (i.e. auxiliary engines on two-engine vehicles, harbor craft, and two-engine sweepers).

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