Cement plants are America's fourth-largest source of airborne mercury, generating about 23, 000 pounds (10, 400 kilograms) a year, EPA says.
环境署称，水泥工厂是美国空气中汞污染物的第四大来源，每年产生约23000磅（10400公斤）的汞污染物。
Cement and concrete is one of the world's dirtiest industries, generating 10 to 12 per cent of all global emissions.
水泥和混疑土是世界上最脏的行业之一，有10%到12%的温室气体都是他们排放出来的。
Cement and concrete is one of the world's dirtiest industries, generating 10 to 12 per cent of all global emissions.
水泥和混疑土是世界上最脏的行业之一，有10%到12%的温室气体都是他们排放出来的。
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