More than half of Switzerland's native fish species are threatened with extinction or are already extinct within the country's waters, a new assessment showed Wednesday.
Ecology
11 hours ago
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In a new analysis involving adolescents living in London, exposure to higher levels of the pollutant nitrogen dioxide was associated with lower systolic blood pressure, while exposure to higher levels of particulate matter ...
Environment
12 hours ago
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8
A pollutant is a waste material that pollutes air, water or soil, and is the cause of pollution.
Three factors determine the severity of a pollutant: its chemical nature, its concentration and its persistence. Some pollutants are biodegradable and therefore will not persist in the environment in the long term. However the degradation products of some pollutants are themselves polluting such as the products DDE and DDD produced from degradation of DDT
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