As lead and arsenic pollution element are skew distribution, statistics of a natural background value and a content of lead and arsenic are worked out using median method of skew distribution.
由手铅、砷污染元素呈偏态分布，故采用偏态分布中的中位数法作了铅、砷自然背景值及含量的统计。
In the model the contribution from area pollution sources was calculated by transforming it to the background concentration, so the model was greatly simplified.
在模型中尝试性地将面源污染产生的浓度贡献转化到背景值中计算，简化了解析模型。
BACKGROUND: Environment pollution due to lead is severe day by day, and the lead-induced developmental toxicity of central nervous system is prominent.
背景：环境铅污染日趋严重，铅致中枢神经系统发育的毒性较为突出。
Based on the analysis of the malodorous black water bodies' background, the serious organic pollution of rivers and obvious tendency to eutrophication were demonstrated.
根据对其黑臭的背景分析，发现水体有机污染较严重，河道富营养化趋势较为明显。
This paper analyzes some problems existing in Shanxi's environmental emergency monitoring of the natural background, present environmental pollution, technical equipment, and personnel quality, etc.
剖析了山西省环境应急监测在自然背景、环境污染现状、技术装备、人员素质等方面存在的问题，提出了强化环境应急监测的对策建议。
The second part: The background and the origin of pollution caused by village and township industry.
第二部分：乡镇工业环境污染的背景与成因。
Some groundwater environmental background values were suggested to be the important reference index of groundwater oil pollution.
提出地下水环境对照值可以作为地下水是否受到油类污染的重要参考指标。
The combined effect of high geological background, acidic surface environment and the industrial pollution are the main reasons cause higher levels of heavy metals.
地质高背景、酸性表生环境和工业污染的共同作用，是造成环境中重金属元素含量较高的主要原因。
According to study on non pollution bamboo shoot production, analysis was made on background, basis and technical index for standard formulation.
通过对无公害竹笋生产技术的研究，提出了无公害竹笋标准制订背景、标准制订的依据，以及标准的技术指标；
The article introduces the fitness and evolution of creatures and the harm from pollution background.
主要就污染物对动物、植物及人体健康的危害，以及在污染条件下生物的适应与进化作一综述。
Its radon pollution is low, near to the environment background value.
氡污染水平较低，接近环境本底水平值。
Its radon pollution is low, near to the environment background value.
氡污染水平较低，接近环境本底水平值。
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