Dust

Dust is a general name for minute solid particles with diameters less than 20 thou (500 micrometres). Particles in the atmosphere arise from various sources such as soil dust lifted up by wind, volcanic eruptions and pollution. Dust in homes, offices and other human environments consists of human skin cells, plant pollen, human and animal hairs, textile fibres, paper fibres, minerals from outdoor soil, and many other materials which may be found in the local environment.

Source: Wikipedia

The environment would be better off without dust, but dust is one of those things that we can't stop. We couldn't possibly stop shredding our skins could we? Only if somehow scientists could change our human genes... which won't be happening in the near future! Plant pollen, minerals and hair are also things we are unable to stop. This means dust will continue to be a big part of the environment...