“…Direct chemical pollutants found in the air result from emissions from motorized vehicles, public power utilities and domestic heating equipment, industrial effluents, natural and man-made explosions, nuclear reactors, industrial activities, volatile organic emissions, refuse burning, and personal habits, such as smoking (Wohlers 1971). Pollutants are the direct discharge into the atmosphere of foreign gases, vapors, droplets and particles, or of excessive amounts of normal constituents, such as carbon dioxide and suspended particulate matter.…”