Port of Los Angeles Hit Record-Low Emissions per Container—Add Carbon Intensity to Gateway Scores

The Port of Los Angeles has recorded its lowest emissions per container since its air-emissions inventory began. That is a meaningful operational signal—but it is not a complete routing decision.

SupplyChainBrain reports that the port handled nearly 10.2 million TEUs in 2025 while achieving record-low emissions intensity. Since 2005, container volume has risen 37%, while diesel particulate matter fell 90%, nitrogen oxides fell 72%, sulfur oxides fell 98%, and greenhouse-gas emissions fell 16%.

For shippers and freight forwarders, the lesson is not simply to label Los Angeles a “green port.” It is to make carbon intensity one governed input in a gateway score that also includes dwell, reliability, inland distance, cost, and equipment availability.

Understand what emissions per container actually says

An intensity metric divides port-related emissions by cargo throughput, commonly expressed per TEU. It answers a useful question: how much pollution was associated with moving one standardized unit of container volume through the gateway during the reporting period?

It does not answer every sustainability question. Total emissions can increase even as emissions per container decline if cargo volume grows quickly enough. Boundaries also matter: a port inventory may include ships, trucks, locomotives, harbor craft, and cargo-handling equipment within defined geographic and operational limits, while excluding a shipment's full ocean voyage or inland journey.

The Los Angeles results show both intensity and absolute progress. In 2025 alone, diesel particulate matter declined 2%, NOx 4%, SOx 5%, and greenhouse gases 3% from 2024. NOx reached its lowest annual total since tracking began in 2005. Those figures are stronger evidence than an intensity record by itself, but they still describe the port system—not the door-to-door footprint of a specific shipment.

Score carbon beside service and cost

A gateway score should keep unlike measures separate before combining them. At minimum, evaluate:

• Carbon intensity: the latest port-level greenhouse-gas factor, its unit, inventory year, and boundary.
• Dwell and reliability: truck and rail dwell, schedule variability, missed connections, and terminal congestion.
• Inland distance: mileage to the consignee, likely mode, drayage pattern, and empty repositioning.
• Cost: ocean rate, terminal charges, drayage, rail or truck linehaul, and expected accessorials.
• Capacity: vessel options, chassis and container supply, appointments, rail slots, and carrier acceptance.

This prevents a low port factor from masking a high-emission inland move. A gateway closer to the destination may outperform a cleaner port if the alternative requires hundreds of extra truck miles. Conversely, a rail-friendly gateway with dependable connections may reduce both emissions and variability despite a longer nominal route.

Service conditions can change faster than annual emissions inventories. Supply Chain Dive reported that September 2026 local truck dwell at the San Pedro Bay ports rose to 3.18 days, from 2.95 days in August, while rail dwell increased to 7.19 days, from 6.75 days. The Port of Los Angeles simultaneously processed a record 1.04 million TEUs that month. A useful gateway model therefore pairs slow-moving environmental factors with current operating data.

Make shipment allocation auditable

Customers, regulators, and auditors need more than a sustainability label. They need to see how a shared port total became a shipment-level estimate.

Choose an allocation method and apply it consistently. TEU-based allocation is practical for containerized freight, but document how a forty-foot container is converted, how less-than-container-load cargo is apportioned, and whether weight or revenue-ton methods are used for other cargo. Never switch among allocation methods merely to obtain a more favorable result.

Each calculated estimate should retain:

• source publisher and report URL;
• inventory year and retrieval date;
• pollutant or CO2-equivalent measure;
• system boundary and included equipment classes;
• denominator and unit conversion;
• shipment volume used in the calculation;
• methodology version and approver.

Keep reported values distinct from modeled values. If a port publishes total greenhouse gases and annual TEUs, a calculated per-TEU figure is a derived estimate. Label it that way. If missing data is filled with a regional proxy, record the substitution and its confidence level.

Track why the number changes

The port's progress reflects changes in equipment and operations, not accounting alone. SupplyChainBrain says zero-emission units reached 14% of cargo-handling equipment in 2025 after the electric fleet grew 20% in one year. For trucks, annual diesel particulate matter and NOx emissions fell 16% and 25%, respectively. Ship emissions have also benefited from cleaner fuels, shore power, capture technologies, and fewer arrivals.

Those drivers matter because historical factors expire. A routing engine using a 2022 figure may misstate current performance, while a newly published annual inventory may still lag present congestion or equipment conditions. Store an effective date, evidence date, and next-review date with every factor. Do not silently overwrite the old value: preserve the version used for every booked shipment and customer report.

Put the gateway score into execution

Carbon scoring creates value when it changes a decision. During routing, CXTMS can compare eligible gateways and show planners the tradeoff between estimated emissions, transit time, reliability, and landed cost. Users should be able to adjust the weighting by customer commitment, commodity, service level, or emissions target without changing the underlying evidence.

At booking, freeze the selected assumptions. If the route changes, recalculate and retain both versions with a reason code. After delivery, replace planned mileage, mode, and volume with actual values where available. Exceptions—such as an extended dwell, diverted container, or emergency truck move—should flow into the final estimate rather than disappearing behind the original plan.

Finally, report decisions in plain language. “Lowest emissions per container on record” is credible context. “This was the lowest-emission route” requires comparative evidence across the relevant alternatives and the entire defined journey.

Los Angeles demonstrates that cargo growth and cleaner operations can coexist. The next step for logistics teams is to turn that progress into a transparent, repeatable gateway decision—without ignoring the service and inland consequences that determine the shipment's real outcome.

Ready to add evidence-backed carbon intensity to gateway selection? Request a CXTMS demo to connect routing, execution, and auditable emissions reporting in one workflow.