Over seventy percent of the total pollution in San Diego County is
generated from mobile sources. The purpose of the Mobile Source
Program is to reduce public exposure to diesel particulate matter (PM)
and smog forming Nitrogen Oxide (NOx) emissions from diesel powered
trucks, buses, and other heavy duty equipment.
What Are The Regulations?
- Regulated On-Road commercial heavy duty diesel trucks
including drayage trucks and buses must meet the California Air
Recourses Board (CARB) emission standards. An Engine Control Label
(ECL) verifying that these emission standards are met must be
affixed to the vehicle's engine. See CARB's
Mobile Source's Page for additional information.
Refrigeration Units are subject to emission standards.
Restrictions: Heavy Duty commercial diesel vehicles with a GVWR
of over 10,000 lbs and school buses are required to restrict engine
- If you would like to verify if a company or fleet has
reported compliance with the Truck and Bus regulation to the Air
Resources Board click here.
and Bus Regulation- How to Verify if Hired Fleets Comply
- Regulated Off-Road equipment must be reported into CARB's
Diesel Off-Road Online Reporting System (DOORS).
- DOORS public information lookup- All vehicles subject to the
Off-Road diesel-fueled fleets regulation should be labeled with
Equipment Identification Numbers (EINs) by September 2009. All EINs
consist of six characters - two upper case letters, one number, one
upper case letter, and then two numbers (for example, RH4M79). If
you suspect a vehicle you observe has a fraudulent EIN, you can look up
further information on the vehicle including vehicle type, and
vehicle manufacturer. Enter the EIN in the box provided. Be sure to
use uppercase letters. You can also verify if a company has a certification
of compliance for their fleet.
User Guide - Public Info Look Up
Exhaust Smoke Opacity Requirements:
- On-Road equipment must meet the requirements of the periodic
smoke inspection program. For more information see here.
How Do We Ensure Compliance?
Inspections: The San Diego Air Pollution Control District
(District) signed a Memorandum of Understanding with the California
Air Resources Board to enforce certain mobile source
regulations. District inspectors will enforce mobile source
requirements through inspections of On-Road and Off-Road equipment at
ports, highway patrol stops, places of business, etc. Additionally,
inspections of mobile sources may occur concurrently with inspections
of permitted stationary equipment. A Compliance
Advisory was issued on 04/22/16 to notify equipment operators that
the District will enforce certain mobile source regulations.
For Eligible Mobile Source operator applicants, the District
administers a number of grant programs for partially funding the
replacement of older engines or vehicles with new, less polluting
models. Learn more
Compliance Division Contact
If you have any questions, please contact the Mobile Sources
Coordinator by email or
phone at (858) 586-2677.