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Off Road Emission Solutions

Holt of California's Emissions Solutions Department can bring your machine or fleet in compliance with the most current regulations passed by CARB, such as the 'In-use Off-road Diesel Vehicle Regulation'.

Air quality regulations affecting diesel engines will have an impact on how you do business in California. These emission regulations can affect what types of machines can be used in construction, mining and industrial operations in the State of California, for both mobile and stationary, diesel-powered equipment. These emission regulations can mandate either equipment replacement, repower, or retrofit to bring your equipment into compliance. We can help.

Caterpillar has a robust Tier 4 introduction plan, which will allow a transition from Tier 3 to Tier 4 products in a smooth and orderly fashion by utilizing a variety of the transitional tools provided in the regulations. The goal is to maximize value to you, our end-users.

Our experts have the education and experience required to meet the mandates through a variety of services offered including:

  • Fleet Analysis
  • Fleet Compliance Planning
  • CARB 'DOORS' Registration & Labeling
  • Local AQMD Regulation Guidance
  • Machine Repowers
  • Diesel Particulate Filter (DPF) Service
  • Carl Moyer Program Funding Assistance
  • Opacity Testing

Machine Solutions

Holt of California offers a number of Caterpillar and Dealer-approved repower solutions to upgrade your existing machine to a newer tier to meet emission regulations. Please contact This email address is being protected from spambots. You need JavaScript enabled to view it. at (916) 921-8956 for more information.

More Information on Emissions Solutions & Regulations

San Joaquin Valley APCD
 Read here to learn about the San Joaquin Valley APCD's requirement that all Tier 1 & 2 diesel engines over 50 HP be replaced with Tier 4 by January 2015. 

Sacramento Metropolitan Air Quality Management District

Holt of California – Emissions Solutions
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The California Off-Road Diesel Rule
This presentation is in Microsoft Power Point and is a large file so could take some time to open or save

Cleaning the Air - Tier 4 emissions standards

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