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Found 2 translations.

Name	Current message text
^h English (en)	Zinc in rivers flowing through industrial and mining areas can be as high as 20 ppm. Effective [[sewage treatment]] greatly reduces this; treatment along the [[Rhine]], for example, has decreased zinc levels to 50 ppb. Concentrations of zinc as low as 2 ppm adversely affects the amount of oxygen that fish can carry in their blood.
^h Japanese (ja)	工業地帯や鉱業地帯を流れる河川の亜鉛濃度は20 ppmにもなる。効果的な[[:en:sewage treatment\|下水処理]]はこれを大幅に減少させる。例えば[[:en:Rhine\|ライン川]]沿いの処理では、亜鉛濃度は50 ppbまで低下した。2 ppmという低濃度の亜鉛は、魚が血液中に運べる酸素の量に悪影響を与える。