Environment: Week's Watch

Where does a city's air pollution go? Most scientists believe it eventually becomes diluted by winds or is washed to the earth's surface by rain. Last week Biophysicist William A. Curby offered another, more alarming answer at the annual meeting of the American Public Health Association. After sampling the air three times a day during the past two summers, Curby and his associates at Sias Laboratories in Brookline, Mass., discovered that auto exhaust and industrial fumes create a new atmospheric phenomenon—a layer of "dead sky" composed of tiny, concentrated particles. Unmoved by either...

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