What defines a regulated area according to OSHA regulations?

A regulated area, according to OSHA regulations, is specifically defined as an area where airborne concentrations of asbestos may exceed the permissible exposure limits (PEL). This designation is crucial for ensuring worker safety and health during asbestos-related activities, which can involve handling or disturbing asbestos-containing materials.

In a regulated area, specific safety protocols must be followed to minimize exposure risk. This can include required personal protective equipment (PPE) and restricted access for individuals who are not authorized or properly trained to be in that environment. The designation helps in managing the risk of asbestos exposure effectively, protecting workers and ensuring compliance with safety regulations.

The other options do not accurately represent the definition or characteristics of regulated areas. Areas below the PEL do not need to be regulated, as they do not pose a significant risk. Areas designated for rescue operations or where no construction is allowed do not inherently relate to asbestos exposure limits or the necessity for regulation under OSHA guidelines.