Fumes and oily mists are emissions that are generated as a result of friction and heating of particular substances such as cooling lubricant oils used in many industrial processes, especially in the metalworking sector. Often the spread of pollutants within the work environment is related to both of these factors.

Oil mist
Oil mist consists of airborne oil droplets.The size of these varies from 1 to 10 μ m.La oil mist is normally formed in processes where coolant oil is used for chip removal and the most common and effective way to capture it is to purify polluted air as close as possible to the source.

Oil smoke
Oil smoke, like oil mist, consists of airborne droplets of oil. The difference is that these particles are smaller than oil mist particles and usually arrive in larger quantities. The size of oil mist particles varies from 0.1 to 1 µm. The threshold limit for the amount of oil smoke allowed in a workshop is normally the same as for oil mist

–Dust
Dust formed during a variety of applications where dry materials are processed. For example, during welding, laser and plasma cutting,dry grinding, sanding or painting. Dust consists of airborne particles down to 100 microns, which is equivalent to one tenth of a millimetre.
Larger particles that are not airborne are also considered dust particles.