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Meteorological and topographical conditions in the LosAngeles basin cause the retention of dusts and fumes, frequently for several days. Eye irritation and limited visibility are characteristic of the resultant smog. Studies of the aerosols in this area have been undertaken by government and private laboratories. Methods and equipment used by the Los Angeles County Air Pollution Control District in identification of industrial contaminants are described. The roles of sulfuric acid mist and metallurgical dusts in smog formation are discussed. INTHE Los Angeles basin the term smog is applied to the complex blue haze of air pollution which limits visibility and on 53 days of 1948 caused reports of eye, nose, and throat irritation. Natural gas is used for domestic heating, and natural and refinery gas and fuel oils are the principal fuels of industry.

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