Capturing Contaminants at the Source. The most effective method for removing air pollutants directly at the point of generation is with the use of self-supporting fume / dust extractors. By collecting the pollutant directly at the source, exposure of contaminants to operator personnel is reduced dramatically. In many cases, such as welding, brazing, and soldering, overall quality and production can increase due to improved visibility and comfort to the operator. Fume / dust extractors can also be used in applications generating oil mist, dust, odors and gases.