Construction Equipment Owners Face New CARB Compliance Challenges as Los Angeles Tightens Diesel Emission Standards

Construction equipment owners operating in Los Angeles are navigating increasingly complex regulatory requirements as California’s Air Resources Board (CARB) continues to tighten emission standards for off-road diesel vehicles. The most recent amendments to CARB’s “In-Use Off-Road Diesel-Fueled Fleet” regulations took effect on January 1, 2024, with the purpose of reducing emissions from off-road equipment used by construction contractors, such as forklifts, bulldozers, cranes and excavators.

Understanding CARB’s Off-Road Diesel Regulation

The goal of the In-Use Off-Road Diesel-Fueled Fleets Regulation is to reduce particulate matter (PM) and oxides of nitrogen (NOx) emissions from in-use (existing) off-road heavy-duty diesel vehicles in California. The regulations apply to two classes of vehicles: (1) self-propelled off-road diesel-fueled vehicles of 25 horsepower (hp) or more; and (2) two-engine vehicles other than on-road two-engine sweepers. The regulations apply to both owned as well as rented and leased vehicles.

Examples of vehicles included in this rule are off-road vehicles used in industrial operations, mining, and construction, such as airport ground support equipment (GSE), forklifts, backhoes, skid steers, excavators, motor graders, dozers, crawler tractors, and wheel loaders. For Los Angeles construction companies, this means virtually all heavy equipment on job sites must comply with these stringent requirements.

Key Compliance Requirements for Los Angeles Construction Equipment

Construction equipment owners must meet several critical requirements under the updated regulation:

• Equipment Registration and Labeling: All applicable off-road diesel vehicles must be reported to CARB through the Diesel Off-road Online Reporting System (DOORS). When a diesel vehicle is reported, it is assigned a unique equipment identification number (EIN) and must be labeled within 30 days of receiving this EIN.
• Idling Restrictions: Vehicles cannot idle longer than five minutes, though there are exceptions for vehicles that need to idle to perform work.
• Renewable Diesel Requirements: Beginning January 1, 2024, vehicles, including rental vehicles, subject to the regulations are required to only use R99 or R100 renewable diesel fuel.
• Phase-Out Requirements: The regulation requires the phase-out of the oldest and dirtiest engines starting on January 1, 2024, and requires contracting entities to obtain valid Certificates of Reported Compliance for all listed contractors and subcontractors.

Impact on Construction Contractors and Public Works Projects

The regulatory amendments have created new obligations for both contractors and public agencies in Los Angeles. The amended regulations now place monitoring obligations on California public agencies, requiring Public Works Awarding Bodies to obtain valid Certificates of Reported Compliance (CRC) from all contractors and listed subcontractors before awarding projects.

If the low bidder or any of its listed subcontractors fails to provide its CRC, the public agency will be unable to award the project to the low bidder and would be forced to reject the low bid or wait for the low bidder to become CARB compliant before award. This requirement significantly impacts the bidding process for construction projects throughout Los Angeles County.

Fleet Size Considerations and Compliance Pathways

CARB regulations apply differently based on fleet size, creating varying compliance burdens for construction companies:

• Large fleets (over 5,000 total horsepower) face the most stringent requirements, including mandatory turnover schedules and fleet average targets.
• Medium fleets (2,501-5,000 horsepower) have somewhat relaxed timelines but must still meet fleet average targets.
• Small fleets (under 2,500 horsepower) receive the most flexibility, though still subject to BACT (Best Available Control Technology) requirements.

The regulations also provide special optional phase-out requirements for ultra-small fleets (total combined off-road diesel horsepower of 500 hp or less), which may comply with an optional phase-out requirement schedule that allows for phase out of Tier 0 and 1 vehicles by 2029.

Enforcement and Penalties

CARB inspectors visit construction sites unannounced to verify equipment compliance. Missing or illegible labels generate violations during inspections, which CARB conducts both at jobsites and through document audits. However, fleets that discover compliance issues can self-report to CARB, which may result in reduced penalties compared to violations discovered through inspections, with prompt corrective action and demonstrated good-faith compliance efforts supporting favorable enforcement outcomes.

Getting Professional Help with CARB Compliance

Given the complexity of these regulations and the significant penalties for non-compliance, many Los Angeles construction equipment owners are seeking professional assistance to ensure their fleets meet all requirements. Working with experienced automotive service providers who understand the intricacies of becoming CARB Compliant Los Angeles can help equipment owners navigate the regulatory landscape while maintaining operational efficiency.

Looking Ahead: Future Regulatory Changes

The Advanced Clean Fleets regulation, while primarily targeting on-road vehicles, signals CARB’s direction toward zero-emission requirements, with future off-road regulations likely incorporating similar zero-emission mandates. CARB is developing more sophisticated reporting requirements that may include telematics integration for real-time emission monitoring, with regulatory expansion to additional equipment categories and lower horsepower thresholds under consideration.

Construction equipment owners in Los Angeles must stay informed about these evolving requirements to maintain compliance and avoid costly penalties. The regulation represents a significant shift toward cleaner air standards, requiring proactive planning and potentially substantial equipment investments to meet California’s ambitious environmental goals.