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any addition of harmful substances or products in the environment (air, water, soil or food). For questions specifically about [air-polution], [greenhouse-gas-emissions] or [toxic-chemicals] please use those tags.

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One parameter that's involved in water quality assessment is ammoniacal nitrogen (NH3-N), a measure of ammonia. Where does ammonia come from in natural water sources, such as a river? What factor caus …
asked Dec 13 '17 by Dayang