Which of the following is considered a conventional pollutant?

Oil and grease are classified as conventional pollutants because they are commonly found in wastewater and are significant contributors to water pollution. Conventional pollutants typically include a set of common contaminants that have consistent sources and are addressed under various environmental regulations.

These pollutants, such as oil and grease, can cause harm to aquatic life, impair water quality, and disrupt the ecosystems in water bodies. They can enter waterways through industrial discharges, stormwater runoff, and even household waste.

In terms of regulation and monitoring, conventional pollutants are specifically identified because they require consistent management to protect public health and the environment. While other options like bacteria, heavy metals, and nutrients can also be hazardous, they fall under different categories of pollutants. For instance, bacteria are more associated with pathogen-related concerns, heavy metals are classified as toxic pollutants, and nutrients are often identified in discussions related to nutrient loading and eutrophication rather than conventional pollution.