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Exposure limits, also known as exposure standards or exposure guidelines, are values set by regulatory bodies to protect workers and the general public from the harmful effects of hazardous substances. These limits are typically expressed in terms of concentration, duration, and frequency of exposure. The primary goal of exposure limits is to prevent adverse health effects, such as illness, injury, or death, by ensuring that workers are not exposed to hazardous substances beyond safe levels.

Exposure limits are derived from a combination of scientific research, risk assessments, and expert judgment. They are regularly reviewed and updated to reflect the latest scientific findings and technological advancements. The specific values of exposure limits can vary depending on the substance, the duration of exposure, and the route of exposure (e.g., inhalation, ingestion, or skin contact).

In many countries, exposure limits are set by national regulatory bodies, such as the Occupational Safety and Health Administration (OSHA) in the United States or the National Institute for Occupational Safety and Health (NIOSH). These bodies work in collaboration with international organizations, such as the International Labour Organization (ILO) and the World Health Organization (WHO), to develop and harmonize exposure limits globally.

Exposure limits are an essential tool for occupational health and safety management. They provide a clear and measurable target for employers and workers to ensure that hazardous substances are used and handled safely. By adhering to exposure limits, organizations can minimize the risk of workplace accidents and illnesses, thereby promoting a safe and healthy work environment.