Air filtration is very important for air pollution

Filtration is important not only for the greater degree of comfort it provides to those who make use of it, but also for the resulting economy in the proper maintenance of premises and machinery. The economic results are not immediately quantifiable, but a drop in contamination level can be immediately noticed. The particles that are mostly responsible for the contamination is extra fine which can only be filtered by high efficiency filters. When a plant has been operating for several years without an efficient filtration unit, all the components are blocked by particles and fibres. 

Medical research has proved that the particles dispersed in the air and reaching the lungs are 0.3 mm in size while the larger particles remain in the upper passages. Since roughing filters are not effective against particles of approximately 1 mm diameter, high efficiency or absolute filters must consequently be employed. In hospitals, especially in operating theatres, filtration has proven its importance by limiting the spread of hospital infections. Food and pharmaceutical industries also require a high level of filtration in order to increase the shelf life of their products. This can be achieved by entrapping the germs responsible for fermentation with filtration, rather than by using antifermentation products. Many steel products improve in quality if made in cleaner environments and the same applies to machinery construction.A field that requires the maximum degree of filtration is that of electronic industry, where components whit such infinitesimal tolerance are processed, that contaminant particle may even be larger than the components themselves.