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Questions - Need Help?


Staff are available to provide compliance assistance for ARB’s diesel regulations.


Mailing Address

  • California Air Resources Board

Attn: Off-Road Zone
P.O. Box 2815
Sacramento, CA 95812-2815

Fax Number

  • (916) 322-3923

In-Use Off-Road Diesel-Fueled Fleets Regulation and Large Spark-Ignition (LSI) Engine Fleet Requirements Regulation
Calls and emails are answered in the order they are received. Wait and response times are longest near annual reporting and compliance deadlines, so contact us early!

DOORS Email:

  • Response time averages one to two business days.

DOORS Hotline: 1-877-59DOORS (1-877-593-6677)

  • Staff are available to answer in English and Spanish.
  • Calls are answered Monday through Friday; you can leave a voicemail after business hours.

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DOORS Hotline: 1-877-59DOORS (1-877-593-6677)
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