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Contact EPA Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Clean Diesel Technologies & Alternative Fuels

How Can Superfund Reduce Diesel Pollution?

RETROFIT engines with diesel emission control technologies

MAINTAIN in accordance with engine manual (i.e., change air filters, check engine timing, fuel injectors and pumps) and keep engines well tuned

REFUEL with biodiesel, other alternative fuels, or with cleaner fuels such as Ultra Low Sulfur Diesel (ULSD)

MODIFY OPERATIONS by reducing operating and idle time

REPLACE existing engines with new cleaner diesel engines, hybrid engines, or engines compatible with alternative fuels.

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Funding Sources

Diesel Emissions Quantifier

The Diesel Emissions Quantifier (DEQ) is an interactive tool to help estimate emission reductions and cost-effectivenss of clean diesel projects. More information and access to EPA's DEQ


The Cleanup Clean Air Team

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Fact Sheets

Clean Diesel Technologies & Alternative Fuels Fact Sheet (PDF) (Short Version, 1 pg, 68K About PDF)

Clean Diesel Technologies and Alternative Fuels at Superfund Sites (PDF) (Long Version, 7 pp, 173K, About PDF)

Why Use Clean Diesel Equipment?

  • Exposure to diesel emissions such as particulate matter (PM) can have serious health effects, e.g. asthma attacks, heart attacks.
  • Diesel exhaust is a “likely human carcinogen.”
  • Exposure to diesel emissions is of concern for site workers and surrounding communities.
  • Diesel engines emit hydrocarbons (HC) and nitrogen oxides (NOx) which contribute to smog, and carbon monoxide (CO), a poisonous gas.

What Are Some Retrofit Options?

The most common options are Diesel Particulate Filters (DPFs) and Diesel Oxidation Catalysts (DOCs), both which fit on engines like mufflers.

Retrofit Device Reductions Cost/retrofit
DPF PM 90%
HC 90%
CO 60-90%
$7,000 - $10,000
DOC PM 20-50%
HC 50%
CO 40%
$500 - $2,000

What Are Some Alternative Fuel Options?

Alternative Fuel  Reductions Cost/gal vs.
B20 Biodiesel* PM 10%
CO 11%
HC 20%
20¢ less –
40¢ more
Emulsified Fuel PM 16-58%
NOx 9-20%
CO 13%
~ 20¢ more
Natural Gas PM 99%
NOx 25-60%
CO 90-97%
HC 50-75%
~$1 less
*Blend of 20% biodiesel, 80% diesel. Further research is needed but some studies have shown slight increases in NOx emissions when burning biodiesel.

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