WHAT IS SOOT?Soot refers to the dry solid particles produced through the incomplete combustion of hydrocarbon fuels.Other terminology used by specialists from a range of fields to describe similar or identical nanoparticles includes:• Elemental carbon (EC)• Black carbon (BC)• Carbon black (CB)• Refractory carbon (RC)Although the definitions for each may be specific to a field, LII is effective in measuring all of these.