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For a long time, agriculture was regarded as the most important source of biocides in the environment. Meanwhile, however, agents have been discovered in the aquatic environment that are no longer permissible in agriculture or whose seasonal occurrence does not correlate with their utilisation on fields. More recent investigations have revealed that some of these substances also originate in residential areas, where they are used, for example, in anti-algal and anti-fungal paints and plasters for modern façades.
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