(D)PM stands for diesel particulate matter. Particulate matter is a form of air pollution. It is a mixture of liquid and solid dust particulates with a very divergent composition and a dimension smaller than 10µm (micrometer). With diesel generating sets, the black smoke is the soluble organic fraction (SOF)* and the particulate matter that consists of diesel soot particulates (carbon particulates) and lubricant residue.
Particulates with a diameter of 10µm are called PM10 and particulates with a diameter smaller than 2.5µm are called PM2.5.
*Soluble organic fraction is the accumulation of organic particulates derived from engine oil and fuel.
Extra link: http://en.wikipedia.org/wiki/Particulates



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