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Clean truck requirements are being enforced on California roads

Heavy-duty diesel vehicle regulations are regularly enforced on California roads. Learn more about California Air Resources Board's enforcement actions and inspection programs by viewing the penalties and sanctions, cases settled by ARB, and enforcement related web pages, inspection videos and press releases on this page.

Link icon Penalties and sanctions

Enforcement logo with california sealViolations with ARB diesel programs may result in the following penalties and sanctions:

    • Civil penalties ranging from $300 to $10,000 per vehicle per day.

    • Collection procedures with additional late fees and fines.

    • Liens on real estate or personal property such as vehicles and other assets.

    • ARB may obtain a judgment in superior court and can place liens on assets.

    • A Department of Motor Vehicles (DMV) Vehicle License Title Stop (VLT). A DMV VLT Stop will prevent registration, renewal, or transfer of your vehicle(s).

    • At the request of ARB, the California Highway Patrol may remove the vehicle in violation from service.

    • ARB may file with the State Controller a request to offset any amount due a state agency from a person or entity, against any amount owing that person or entity by any state agency. Generally, ARB may file a tax offset request with the Franchise Tax Board for any amount owed due to unpaid violations.

If you have received a citation, a notice will be mailed to you within 2-3 weeks. The letter will explain the necessary steps required to clear the citation. It is important that you follow the instructions provided to you to avoid any late penalties or further enforcement actions.

If you have questions about the citation, please contact the appropriate number at the top right corner of the citation – in general, there will be a check mark next to the listed number. More information can also be found on the back of a citation regarding appeal deadlines and procedures.

Link icon Cases settled by ARB

2013 Settlements
2012 Settlements
2011 Settlements
2010 Settlements

Link icon Important web pages

Diesel Enforcement Programs
Enforcement Penalty Policy and Related Documents
Enforcement Mobile Source Advisories
Heavy-Duty Vehicle Inspection Program and Periodic Smoke Inspection Program
Heavy-Duty Vehicle Idling Emission Reduction Program
Truck and Bus Regulation enforcement information (See question #17)
Enforcement letter dated November 26, 2012

Link icon Inspection videos

Heavy-Duty Inspection at Ports of Entry (15 min)
Heavy-Duty Inspection Program (14 min)

Link icon Press releases


06-24-2013 Thermo King pays $213,200 penalty for violating state air pollution laws
06-19-2013 Air Resources Board steps up border area enforcement
06-13-2013 California's efforts to clean up diesel engines have helped reduce impact of climate change on state, study finds
05-10-2013 ARB settles air quality case with Mex-Cal Trucklines for $300K
01-17-2013 Foster Enterprises fined $300,000 for violating California air quality laws

12-27-2012 $35,000 in fines paid by San Joaquin Regional Transit District
12-04-2012 Deadline looms for California trucks and buses
10-12-2012 ARB "Gear Up for Clean Truck Month" a success
09-11-2012 Ryder Pays $1,000,000 Settlement
07-05-2012 Caterpillar, Inc. pays $510,000 for shipping, selling uncertified equipment in California
05-15-2012 Imperial Irrigation District fined for diesel truck fleet violations
03-09-2012 Donaldson pays $103,000 for selling illegal diesel particulate filters
03-05-2012 Businesses fined for air quality violations
01-09-2012 Businesses fined over $383,000 for air quality violations

09-23-2011 Businesses fined for air quality violations
08-29-2011 Freight transport company pays $59,050 for air quality violations
07-26-2011 Key Energy Services pays $52,000 fine for smoke inspection violations
07-19-2011 Reward Leasing Inc. pays $534,000 in air quality penalties
07-07-2011 Cummins Pays $500,000 in Penalties
06-09-2011 Businesses fined for air quality violations
03-15-2011 City of Compton fined $48,000 for diesel truck and equipment violations

07-20-2010 Over $100,000 in settlement funds go to community colleges, clean-air fund
06-16-2010 Over $40,000 in settlement funds go to community colleges, clean-air fund
05-19-2010 ARB settles air quality violations with Massachusetts company for $55,500
05-19-2010 Over $86,000 in settlement funds go to community colleges, clean-air fund
03-30-2010 West Sacramento company settles with ARB for $32,550 for diesel emissions violations
03-17-2010 Modesto company pays $23,000 for emissions violations
03-04-2010 $15,000 settles emissions violations
02-24-2010 Napa Company fined $14,400 for emissions violations
02-24-2010 Long Beach company fined $31,500 for emissions violations
02-17-2010 Petaluma company fined $20,000 for emissions violations
02-11-2010 Chemical Transfer Company fined $6,500 for emissions violations
02-10-2010 Rapid Harvest Company fined $16,500 for emissions violations
01-13-2010 Newman company fined $37,000 for emissions violations
01-13-2010 San Bernardino County waste hauler fined $307,200 for emissions violations