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[Greek aer — air and bios — life] — organisms that can exist only if there is available free molecular oxygen; to A. may be referred almost all animals and plants, and al

[Greek anti — against and cyclone] — field of heightened air pressure in atmosphere with maximum pressure in its center; it is characterized by dominance of movements of

Any substance in air that could, in high enough concentration, harm man, animals, vegetation or material. Pollutants may include almost any natural or artificial composit

usually under B.s. or simply species it is understood a population, or variety of populations, of species which are able to crossbreed forming a fecund produce (without r