Cleaner Engines for Cleaner Air:Progress and Problems in Reducing Air Pollution from Automobiles. (Report to the Congress).

摘要

Polluted air menaces U.S. cities, threatens the health of millions,and causes an estimated $16billion in damage to materials and crops each year. The largest single polluter is the automobile,emitting over 90million tons of pollutants--about 33percent of the total--into the air in a recent year. Because of the extent to which the automobile intensifies this pollution problem,the General Accounting Office (GAO) reviewed the progress of the Environmental Protection Agency (EPA) in combating auto-caused air pollution and the problems encountered.