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Public Transit Agency Vehicles

The following regulations may affect vehicles owned by a Public Transit Agency:

  • Review the regulations in the table below to see if they apply to you.

  • Speak to an ARB diesel representative about regulations and funding opportunities through the diesel assistance page.

Regulation Basic Regulatory Requirements
Transit Agency Regulation Urban buses and other diesel and alternative fueled vehicles must meet fleet NOx averages and particulate matter reduction goals.

Required to report to ARB annually.

More Information
Idling Reduction Program Applies to commercial motor vehicles (trucks and buses) over 10,000 lbs. gross vehicle weight rating, including sleeper berth trucks during periods of sleep and rest.

Limits idling to five (5) minutes within California borders.

Shorter idling limits apply to the operation of every school bus, transit bus, school pupil activity bus, youth bus, general public paratransit vehicle, and other commercial motor vehicles when within a school zone.

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Periodic Smoke Inspection Program (PSIP) Applies to all California based fleets with two or more vehicles.

Must perform annual smoke and tamper inspections of their fleet vehicles and repair those with excessive smoke emissions.

Smoke inspection and maintenance records must be kept for two years.

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Emission Control Label Inspection Program Applies to all heavy-duty diesel commercial vehicles operating in California.

Requires engine label, called an Emission Control Label, showing that the engine meets the required federal emission standards applicable for the model year of the engine.

More Information

Vehicles and engines found out of compliance with applicable regulations may be subject to civil penalties. Penalties accessed may be up to $10,000 per day.

Vehicles that are not considered part of a Public Transit Agency may be subject to other regulations, go back to the Diesel Vehicles Page to determine if you are subject to other diesel vehicle regulations.

Are financial opportunities available to upgrade my equipment?

Financial opportunities for Public Transit Agencies are limited, but they may be available. Contact your local air district staff or ARB from our diesel assistance page.