Small particles resulting from the incomplete combustion of particles in the atmosphere. Typically refers to the release of smoke ventilation. Most of the carbon It will be smaller than 1 micron.
Small particles resulting from the combustion is not complete is suspended in the atmosphere Generally refers to what release exhaust, mostly carbon is smaller than 1 micron
Small particles resulting from the incomplete combustion of the suspension in the atmosphere. Generally refers to something that most smoke ventilation emissions as carbon, it is smaller than 1 micron.