Background limits refer to the maximum levels of certain pollutants or contaminants that are naturally present in the environment. These limits help establish a baseline for assessing the impact of human activities on air, water, and soil quality. By understanding these natural levels, scientists and regulators can better evaluate whether additional pollution is harmful. In environmental monitoring, background limits are crucial for setting regulatory standards and guidelines. They provide a reference point for determining the safety of various substances, such as heavy metals or pesticides, in ecosystems. This ensures that any increase in these substances due to human activity can be accurately measured and managed.