Answer:
A Risk Assessment
Step-by-step explanation:
The safe levels of chemicals are determined through a process called risk assessment. This process involves evaluating the potential adverse effects of a chemical on human health or the environment and determining the safe levels at which exposure to the chemical is unlikely to cause harm.
To determine safe levels, several factors are considered, such as the toxicity of the chemical, the route of exposure (e.g., ingestion, inhalation, or skin contact), the duration of exposure, and the sensitivity of the population being exposed (e.g., infants, pregnant women, or people with pre-existing health conditions).
The safe levels of chemicals are typically established by regulatory agencies such as the Environmental Protection Agency (EPA) or the Food and Drug Administration (FDA) in the United States. These agencies conduct extensive research and review scientific data to establish safe levels and develop regulations to limit exposure to hazardous chemicals.
The safe levels are often expressed as reference doses (RfDs) or reference concentrations (RfCs) for chemicals that are ingested or inhaled, respectively. These values are based on toxicological data and represent the maximum amount of a chemical that a person can be exposed to without adverse effects over a lifetime.
Overall, determining safe levels of chemicals is a complex process that involves multiple factors, and it is crucial to protect human health and the environment from the harmful effects of exposure to hazardous chemicals.