The pollution thresholds expressed in the different fields of experimental knowledge and technology are very difficult to adopt and apply because of their legal texts and inherent difficulties in their development and update of knowledge. To mitigate these difficulties between law and ecology, the research adopted a methodology that takes into account the changing scientific realities in the legal process by assigning technical committees of a holistic or sectoral nature the responsibility to develop and update the legal technical provisions. Despite these adopted solutions, and despite the purely scientific and technical nature of the technical rules, they face the difficulty of achieving scientific consensus, because of the development of scientific knowledge, which is characterized by a large number of rules governing the various elements, materials, and the medium. This makes it sometimes impossible to carry out the scientific consensus on those thresholds.