这结果至少超过了美国国家空气质量标准的4倍。
That's at least four times greater than exposure standards set by U.S. national air quality standards.
2004年，受监测的342个城市中有210个城市的空气质量超过了国家环境空气质量标准的二级标准。
In 2004, 210 cities exceeded the Class 2 limit values of the National Ambient Air Quality Standard (NAAQS) within the total 342 monitored cities.
结果表明各航道底泥中重金属除铅以外，含量均超过《土壤环境质量标准》中的二级标准，其中镉的污染最为严重。
The result showed the heavy metal content in bed mud was over Soil Environmental Quality Standard Two except Pb, in which Cd pollution was the most significant.
结果证明：研制的变压器油达到和超过GB2536质量标准。
Service test results showed that it can reach and surpass the quality specification of GB2536.
我知道大城市的摩天大楼在2000年后都超过了质量规范要求，但是农村地区的小型建筑也应该有更严格的质量标准。
I understand that the skyscrapers in the large cities already are up to code after year 2000, but the small buildings in the rural areas should meet stricter requirements as well.
我知道大城市的摩天大楼在2000年后都超过了质量规范要求，但是农村地区的小型建筑也应该有更严格的质量标准。
I understand that the skyscrapers in the large cities already are up to code after year 2000, but the small buildings in the rural areas should meet stricter requirements as well.
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