Studies have shown that air pollution has a great effect on the white matter in the brain, but not the grey matter.

Dry plasma cutting: also called the air-filled type cutting, the air compressor to plank cut in order to achieve the effect of cooling seam jet, such cutting costs low, but pollution is very large.

On the negative side, automobiles are the main source of air pollution in the world which creates the so-called green-house effect.