- Chemical pollution is comprised of all the major pollutants resulting from human activity such as medicines, pesticides, hydrocarbons, metals and heavy metals. These chemicals are dangerous for the environment, causing long-lasting pollution with their high toxicity and low biodegradability. Current sanitation systems (collective or not) are very inefficient in the face of this complex and varied pollution. Pollutants therefore end up in the natural environment and are bio-accumulated. In this way, they move up the food chain and increase their concentration at each new level.
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