GB 18558 - 2001 specifies occupational exposure limits for settling silica (silica) dust in the air of the workshop. The standard focuses on the workshop environment and precisely stipulates the maximum allowable concentration of silica dust in the air during the work process of workers. The purpose is to effectively protect the occupational health of workshop workers, prevent health problems caused by long-term exposure to such dust, provide a basis for enterprises to monitor the air mass of the workshop and formulate protective measures, and help create a safe working environment.