Beryllium is a naturally occurring element that can be found in rocks, soil, and air. It is also used in various industries, such as aerospace, electronics, and nuclear energy.

Exposure to beryllium can occur through inhalation of beryllium dust or fumes, ingestion of contaminated food or water, or skin contact with beryllium-containing materials. Beryllium exposure has been associated with health effects such as chronic beryllium disease, lung cancer, and skin sensitization.

The document provides information on the sources of beryllium exposure, the health effects of beryllium exposure, and the regulatory standards for beryllium in drinking water and ambient air. The document also provides guidance on how to test for beryllium in environmental media and how to manage beryllium exposure in occupational and community settings. The document emphasizes the importance of monitoring and managing beryllium levels in the environment to protect human health.