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Published on July 28, 2026
Introduction
Ocean-going vessels (OGV) at berth are a significant source of emissions affecting air quality in California, especially for port-side communities which are often designated as AB 617 or frontline communities. To address these emissions, the California Air Resources Board (CARB) implemented the Ocean-Going Vessels At Berth Regulation (At Berth Regulation), originally adopted in 2007 and updated in 2020. The 2020 At Berth Regulation requires OGVs to use shore power or another CARB Approved Emission Control Strategy (CAECS) while at berth to reduce emissions. However, the At Berth Regulation has sensible flexibilities built in to facilitate compliance while reducing emissions. The updated emissions control requirements of the 2020 At Berth Regulation began in 2023 for container, cruise, and refrigerated cargo vessels. In 2025, the At Berth Regulation phased in tankers at the ports of Los Angeles and Long Beach and auto-carriers/roll-on roll-off (ro-ro) vessels statewide. Additionally, OGV, terminal, and CAECS operators in California must report their visit activity to CARB, even if they do not have emissions control requirements. In 2024 and 2025, CARB’s data showed a compliance rate of over 95% indicating the 2020 At Berth Regulation is successful in reducing and mitigating emissions around our port communities. communities.
Emission Reductions
Despite more controlled vessel visits in 2025, statewide oxides of nitrogen (NOx) were not reduced proportionally because a larger share of those vessel visits used Tier III engines, which emit less NOx than lower tier engines. NOx is responsible for ozone (smog) which is a leading cause of asthma and lung and heart disease. In addition, vessels with Tier I and Tier II engines spent fewer hours under emission control in 2025, limiting the potential for additional emission reductions even as total visits increased.
Some vessel categories may comply by funding remediation. These payments go to the local Air Districts to support clean technology projects that benefit port-adjacent communities. The reductions from these investments are not included in this dashboard at this time.
Navigating the Dashboard
The below dashboard illustrates compliance and other metrics of the 2020 At Berth Regulation over the last two years. Click on "STATEWIDE" to view state-level data, click on individual port names to access specific port-level data, or click on a specific year to access annual data. You can also scroll underneath the dashboard for a list of definitions and descriptions to help better understand the dashboard.
Please note: Compliance data for the Port of Hueneme is not included in the dashboard at this time.
Definitions
Total Visits: Total number of vessel visits reported to CARB in a selected calendar year visiting California ports for all ocean-going vessel types. In addition to the Regulated Visits below, this includes vessel types with only reporting requirements such as bulk and general cargo.
Regulated Visits: Number of vessel visits reported to CARB in a selected calendar year for ocean-going vessel types subject to emissions reductions requirements:
2024: Container, passenger/cruise, and refrigerated cargo.
2025: Container, passenger/cruise, refrigerated cargo, and auto carriers (ro-ro) at all ports. Tankers visiting Port of Los Angeles and Port of Long Beach.
Regulated Visits by Port: Click on a port to access compliance data for that port.
Audited Visits: Number of vessel visits that have been audited by CARB Enforcement in a selected calendar year.
Visits Using Shore Power: Number of audited vessel visits that connected to shore power for any period of time, regardless of compliance.
Visits Using Alternative Control Technology: Number of audited vessel visits that connected to an alternative CAECS for any period of time, regardless of compliance. Please see At Berth Regulation Executive Orders | California Air Resources Board for CARB approved strategies.
Compliance Pathways: Compliance pathways, as outlined by the 2020 At Berth Regulation, are the methods available to regulated parties to ensure compliance for each visit. Regulated parties may use shore power, an alternative CAECS, or an exception (see Categories of Exceptions Granted for more information) to successfully comply with the requirements of the 2020 At Berth Regulation. The chart illustrates that the majority of vessel visits use shore power to comply with the 2020 At Berth Regulation.
Categories of Exceptions Granted: The chart shows all the categories of exceptions that CARB granted to vessel visits, consistent with the 2020 At Berth Regulation. Please note that "Exceptions" do not always mean visits with no emission control. Many excepted visits, such as "Commissioning", still reduce a portion of vessel emissions at berth (2020 At Berth Regulations Section 93130.4. Exceptions). While these exceptions are described in further detail in the 2020 At Berth Regulation, the exception types can be summarized as follows:
Research: A vessel visit may be granted a research exception if it participates in research in accordance with a CARB-approved test plan.
Safety/Emergency: An event due to severe weather conditions, a utility event, or other extraordinary reasons beyond the operator’s control.
Vessel Incident Events (VIE) and Terminal Incident Events (TIE): VIEs and TIEs are designed to provide regulated vessel fleets and terminal operators with a certain amount of flexibility for a limited number of regulated vessel visits during which emissions are not reduced. The number of VIEs and TIEs granted is based on the size of a regulated party's fleet or operation in the year prior (5% and 15% respectively for 2024, 5% for each for 2025).
Commissioning: Commissioning occurs when a shore power system on a vessel is tested for the first time or after it has been repaired to ensure it is working properly and is compatible with the shore-side system.
Low Activity Terminal: A low activity terminal is a terminal which receives fewer than 20 visits a year of one vessel type. Visits to a low activity terminal do not have emissions control requirements.
Compliance Status: The compliance status for each port shows its compliance rate, defined as the proportion of compliant visits out of the total audited visits at that port. Visits not deemed “compliant” are either “Pending” further investigation or have been issued a “Violation.” The 'STATEWIDE' compliance status excludes data from the Port of Hueneme.
Total Remediation Fund Payments: The amount of remediation fund payments received by the respective Air District for each Port for visits that took place in the selected year. The "Remediation fund" refers to an account set up by a fund administrator approved by CARB under a Memorandum of Understanding. Current fund administrators include the local Air Districts and California Air Pollution Control Officers Association (CAPCOA). Regulated entities can contribute to this fund to offset their uncontrolled emissions during a vessel visit under specific conditions. This compliance option is available by request, and CARB evaluates each request on a case-by-case basis. Collected funds support projects that lower emissions in affected port communities. For more information, please visit Remediation Fund | California Air Resources Board
Engine Fuel Type: The data reflects the types of marine fuels used during vessel visits at berth in California, consistent with the Ocean-Going Vessel Fuel Regulation. The primary fuels employed are Marine Gas Oil/Marine Diesel Oil (MGO/MDO), and Liquid Natural Gas (LNG). Please note that this data is based solely on vessel reports and is not verified by CARB. However, CARB conducts frequent field inspections to verify compliance with the OGV Fuel Regulation and pursues violations when discovered.
Emission Reduction (tons/year): The amount of emissions reduced in tons of NOX, particulate matter (PM2.5) and carbon dioxide (CO2) achieved by ocean-going vessels (OGVs)that connected to shore power or used another CAECS while docked at California ports as a result of the regulatory measures in place from the 2020 At Berth Regulation. Please note that this data is for emission reductions from auxiliary engines only and is calculated based solely on vessel reporting data submitted to CARB. For calculation methodology, please refer to the 2025 California Ocean-Going Vessel Emissions Inventory.
VIE/TIE: Flexibilities issued by CARB and their usage data at regulated California ports in a selected calendar year.
Terminal: A facility consisting of adjacent wharves, piers, docks, other berthing locations and storage, which are used primarily for loading and unloading of passengers, cargo or material from vessels or for the temporary storage of this cargo or material on-site.