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Weapons of mass destruction
containing
the substance
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hygienic rating of the content of harmful substances in the environment
гигиеническое нормирование содержания вредных веществ в окружающей среде
maximum permissible concentration of harmful substance in the working zone area
ПДК вредного вещества в воздухе рабочей зоны
(a term used in Russia)
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