Many people think of pollution as the air that we breathe outdoors. Not everyone realizes that the air we breathe indoors is much more polluted.
There are pollutants in the atmosphere that have reached a level that is causing a threat to the health of individuals. Pollution began in the early times from the gases of molten volcanic activity being released into the atmosphere. Additional pollutants were caused by the combustion of biomass, volatilization of organic compounds, and the release of bio-effluents from living organisms. Pollutants can be caused by the natural movements and actions of the planet itself. Particles can become suspended in the air by abrasive action of surface winds, fires, wave action, and the fracture of crystalline aerosols. Spores, fibers, and seeds can cause natural biological pollution. Even these natural events can have an adverse effect on the climate and weather as well as agriculture and humans.
When humans began building shelters for......
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