state, solid, liquid or gaseous pollutant, density, affects how quickly a pollutant will settle, point source, pollution from a single, identifiable outlet, diffuse source, pollution from many inputs, chemical reactivity, how easily new compounds form, direct, effects of pollutants on living organisms, indirect, effects of pollution causing harmful environmental changes, chronic, effects of pollutants appearing slowly and are long lasting, acute, effects of pollutants which are short term and appear quickly.

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