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高空中的臭氧层可过滤紫外线等有害射线,保护地球生命。但因废气排放而弥漫于地表的臭氧却是一种有害气体。美国科学家的一项最新研究显示,美国每年有数千人死于这种地表臭氧引起的呼吸系统疾病。
The ozone layer at high altitude can filter ultraviolet rays and other harmful rays to protect the life of the earth. But because of exhaust emissions and the percolation of the surface of ozone is a noxious gas. A new study by U.S. scientists shows that thousands of people die every year in the United States of this respiratory disease caused by surface ozone.