Supercoarse Particles
Supercoarse particles are greater than 10 micrometers in size. 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 contains human skin cells, small amounts of plant pollen, human and animal hairs, textile fibers, paper fibres, minerals from outdoor soil, and many other materials which may be found in the local environment.