they prove inadequate, may frustrate State A’s efforts to prevent, reduce and control pollution of the portion of the watercourse in its territory, or at lQw Appreciable pollution harm to the “environment” of a watercourse State could also take the form of harm to human health in the form of diseases, or their vectors, carried by water. While harm to “human health” is expressly mentioned fn paragraph 2, other forms of appreciable ham that are not directly connected with the use of water may also result from pollution of an international watercourse [system], Jb!w International agreements concerning water pollution normally have as one of their explicit or implicit objects the harmonisation of the relevant policies and standards 0-E the watercourse States concerned. This is true whether the agreement concern,; the protect.irdA of fisheries (see, e.qb article 17 of the 1904 Convention between France and Switzerland for the regulation of fishing in their frontier waters, mve Texts . . <,m, note 164, Treaty No. 196, p. 7061, or the prevention of adverse effects upon certain uses (see, e.g. article 4, para. 10 of the 1960 Indus Waters Treaty between India and Pakistan, m d&!&,!~ Texts ., L, supra, note 164, Treaty No. 97, p, 300), or actually sets water quality standards and objectives (see, e.g. the 1978 Agreement between Canada and the United States on Great Lakes Water Quality, e.g. article II, I-, t;ote 163). Thus, harmonisation may be achieved by agreement upon specific policies and standards or by requiring that pollution not exceed levels necessary for the protection of a particular resource, use or amenity. See generally the discussion of international aqreemerts concerning water pollution in the Fourth report of the Special Rapporteur (A/CN.4/412/Add.l), paras. 39-48. 2441 United Nation8 Convention on the Law of the Sea, article 194, para. 1.
**Analysis**
The text discusses the international law regarding pollution of watercourses, highlighting the importance of harmonization of policies and standards among states to prevent and control pollution. It mentions the potential harm to human health and the environment, as well as the need to protect fisheries and other uses of water. These themes suggest that the text is primarily focused on environmental concerns.

**Category**
Natural resources and environment, Health