In the United States, regulatory tools for protecting workers include legally enforceable permissible exposure limits for specific workplace chemicals. The United States Occupational Safety and Health Administration (OSHA) has set a legal restriction known as the permissible exposure limit (PEL) that controls how much exposure to chemicals or physical conditions like noise is permitted.
Usually, these restrictions are set based on a time-weighted average (TWA), like 8 or 10 hours. The purpose of permissible exposure limits (PELs) is to safeguard the health and welfare of industrial workers. Employers are guided by the PEL and the time-weighted average (TWA) on the maximum amount of time, staff members may be exposed to various concentrations of particular chemicals.
The present OSHA PELs were written in 1970 and have not been revised till now. Since then, technological advancements have shown that the current limitations would not be sufficient to protect workers' health.
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