So you can now understand what is a part per million. ppm in this context probably means parts per million. This is the concentration of a chemical or element in something like food or drink. for example 8 milligrams of mercury in 100 grams of fish would result in a mercury concentration of 0.8 ppm (parts per million)
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Cumulative effects are changes to the environment that are caused by an action in combination with other past, present and future human actions. [Numerous definitions of. exist in the literature. Many of these are quite complicated and refer to technical aspects of cumulative effect's interactions..2.1 Effects Pathways. Cumulative effects occur as interactions between actions, between actions and the environment, and between components of the environment. These pathways between a cause (or source) and an effect are often the focus of an assessment of cumulative effects.