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DPM Frequently Asked Questions

What is DPM?

Diesel Particulate Matter or DPM are the particulate components of Diesel exhaust, and include both Diesel “soot” and other aerosol solids such as ash particulates, metals, sulfates and silicates.  The main component of DPM is elemental or “black” carbon.  This usually forms the core of the particle, which often has a toxic mix of other substances on its surface.  Diesel particles are generally less than 1 micron in diameter.

How do I know if I have a problem?

There is no way to tell if you have a problem with DPM from a visual inspection, equipment list or ventilation survey.  Many factors are involved in both the production and mitigation of DPM and the only reliable method for determining exposure levels at your facility is by conducting an in-depth baseline study.  This consists of a mine-wide survey of DPM levels for all areas and activities where miners normally work or travel underground.  Comprehensive analysis of the sample values, along with various other parameters such as equipment maintenance and airflow quantity and velocity will alert the mine operator to any areas of concern.

What can I do about DPM?

If high levels of DPM are detected, there are a variety of ways to lower them to within acceptable levels.  Fuel, ventilation, equipment inventory and maintenance, after treatment products and a variety of other means exist for the reduction of diesel emissions.  Each method of DPM reduction is somewhat unique and will have different results in different applications.  With so many available options, all with unique properties and results, choosing the correct method for your specific application becomes especially important.

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