After five years of testing air pollution above 65 of the nation's biggest urban areas, the U.S. Public Health Service last week airily ranked the six dirtiest cities, in order, as New York, Chicago, Philadelphia, Los Angeles, Cleveland and Pittsburgh. Since none of the smoggiest metropolises has been wracked by major racial violence so far this year, scientists and sociologists will presumably attempt to measure the inverse effect of black air on black power.
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