但由于这类农药能造成土壤和水资源的污染，故实现对其浓度的监测具有重要意义。
Therefore, it has an important value to monitor its concentration and develop monitoring instrument.
各种污染物日平均浓度值与地面风速相关也非常好。
Daily average concentration of various pollutants also has a close correlation with ground wind velocity.
物理稀释作用对水相中污染物浓度降低的贡献相对较小；
The contribution of physical dilution to the water quality recoverability is relatively small;
物理稀释作用对水相中污染物浓度降低的贡献相对较小；
The contribution of physical dilution to the water quality recoverability is relatively small;
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