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Since the introduction of air conditioning, people have recognized that artificial climates lack some intangible quality that characterizes outside air at its best. However purified, moved, protected or otherwise treated, the air of air conditioning systems designed for human consumption fails to measure up to the "zestfulness of country air." A variety of investigations has been directed to the determination and provision of this highly desirable quality. At various times consideration has been given to the use of ionization, ozone, chlorophyll and other devices and materials. Numerous products and procedures have reached the market with the claim that outside air with all its good qualities has been reproduced on the inside. Largely these claims are merely claims, without reality. The American Society of Heating and Ventilating Engineers through one of its official publications has stated that "extensive studies have failed to elucidate the cause of the stimulating qualities of country
AIR FRESHENERS. JAMA. 1945;127(15):990. doi:10.1001/jama.1945.02860150034008
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