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area limited in its size, to which there may be referred all characteristics of a certain environmental impact.

source of emission or discharge of pollutants that has a fixed mouth.

source of impact for which all necessary methods and means allowing to change its characteristics in a given direction are available.

source of impact the position of which in space is not vary in a considered period of its activity.

source of emissions or discharges of pollutants that has no fixed mouth.

source of impact for which there are not available methods and means allowing to change its characteristics in a given direction.

source of impact the linear dimensions of which have no impact on assessment of the environmental quality in design points being under consideration.