PERP Regulation and Portable Engine ATCM
Portable Engine 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). Please review the Portable Diesel Engine ATCM Final Regulation Order.
- 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 option.
These requirements are described below.
Tier Phase Out Option
Fleet-Averaging Option - Large Fleets Only
The Fleet Reporting Tools below can be used to determine the average PM emission rate for the engines in your fleet. Large fleets must first notify PERP and register all their district-permitted engines in PERP by June 30, 2019. Use one of the Request to Comply With Fleet Average Option Calculators to opt into the fleet averaging option. This calculator includes printable pages and a compliance statement page, which must be mailed to PERP by June 30, 2019.
Be advised that we are providing the reporting tools as a convenience. The ultimate responsibility for accuracy and compliance is yours. If you encounter any problems with the reporting tool or have any questions or comments, please call CARB staff.
Fleet Reporting Tools
Calculators for large fleets only choosing to comply with the Fleet Average Option (not required for those following the tier phase out option):
- Request to Comply With the Fleet Average Option - Short Version (up to 20 engines)
- Request to Comply With the Fleet Average Option
- Request to Comply With the Fleet Average Option - Expanded Version
Changes to Large Fleets
The ATCM also requires large fleet owners opting into the fleet averaging option to ensure the average PM emission level for their fleet does not fall out of compliance due to changes in the fleet. Large fleet owners who are adding or removing engines must re-calculate their fleet average. Other changes, such as modifying a registration to be low-use or emergency-use only can also affect the fleet emissions average. We strongly recommend that once you have completed the Request to Comply with Fleet Average Option, save it and update it any time your portable fleet changes.