The Western Power Products commitment to clean air does not end with offering best-in-class EPA certified, fuel efficient John Deere and Yanmar diesel engines. It extends to helping OEMs and end-users access information that will assist them in understanding and complying with regulations applicable to their businesses. We invite you to explore this emissions section and visit the linked sites for more information. However, emissions regulations driven by Federal and State clean air standards and local Air Pollution Control District interpretations are very complex. The links are provided as an information service only and Western Power Products, Inc. is not responsible for the content of any referenced or linked off-site page and is not liable for that content. Users specifically seeking information about California emissions regulation requirements administered by the California Air Resources Board (CARB) are reminded that individual local air pollution control districts (APCDs) have the final say about compliance in their respective areas. Users must contact their local APCD for answers to questions concerning specific compliance issues.

Frequently Asked Questions

Engine Model Year Equipment Registration Number Off-Road Registration Deadlines and Penalties
Portable Equipment VEDCS Credits Yard Trucks

5 Things You Need To Know

To Intelligently Make Fleet Compliance Decisions

Once you've made a list of each diesel-powered piece of equipment, categorized by their specific controlling Airborne Toxic Control Measure (ATCM), you need to collect the following information:

  1. Tier Level of existing engine (not the equipment make, model or type - but the engine itself).
  2. Cost and Availability of the Four R’s: Retirement, Replacement, Repower, Retrofit
  3. Longevity of equipment before major repairs - ie, should I replace or repower?. Is it an easy repower, difficult or even impossible?
  4. How many hours per year do you use the equipment? Under 100 hours, it is exempt. Could retire several pieces of older equipment and replace with new T3 or i-T4 flexible machine (ie, replace a single function paddle scraper with a motor grader that could do some of each)
  5. Fuel usage. The increased fuel efficiency of a new engine may, by itself, justify the new equipment purchase or repower. Ask your dealer for engine-specific fuel consumption data.

Funding Programs

The Carl Moyer Program is a voluntary grant program implemented by the California Air Resources Board and local Air Pollution Control Districts to reduce air pollution from on-road and off-road vehicles and equipment. Projects typically involve replacing (i.e. repowering) old diesel engines, purchasing new vehicles or equipment, or retrofitting older engines with emission control devices, such as diesel particulate filters. Air Pollution Control Districts are required to match funds, so the funding amounts availabile and yearly application deadlines vary widely from district to district. Funds must be used to place engines in service ahead of EPA Tier-level deadlines. For additional information, visit these sites:

Carl Moyer Memorial Air Quality Standards Attainment Program


List of local air district Carl Moyer Program contacts:

The Environmental Quality Incentives Program (EQIP) Conservation Innovation Grants (b) [CIG (b)] portion of the 2008 USDA Farm Bill provides $10.7 Million for California agricultural equipment replacement plus engine retrofits and repowers. The Fact Sheet (link to pdf) shows the amounts available by equipment types and engine size. The Program Description (link to pdf) lists the California counties eligible for the program. Applications must be submitted to an NRCS field office by June 26, 2009.

Questions and applications are handled directly by the USDA/NRCS field offices

Environmental Quality Incentives Program

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