The PAHs density is far higher than the limit of"environmental quality standard of surface water"which proves that PAHs pollution of the Meiliang bay source water is serious comparatively.
其中梅梁湾水源地水体中苯并（a）芘浓度远高于《地表水环境质量标准》规定的要求，说明梅梁湾水源地受苯并（a）芘的污染较为严重。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
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