What is one specific requirement for air environments during asbestos removal?

During asbestos removal, maintaining safe air environments is critical to minimize exposure to airborne asbestos fibers. One specific requirement is the use of negative air pressure enclosures. This approach ensures that air within the work area is drawn into the enclosure and filtered before it is released into the environment, effectively preventing contamination of surrounding areas.

By establishing negative pressure, any potential release of asbestos fibers is contained within the designated work area. This is particularly important because asbestos can pose serious health risks if inhaled, so controlling the air environment helps protect not only the workers involved in the removal but also the general public and nearby occupants.

The other options do not align with safety protocols. For instance, allowing visible emissions would undermine the entire purpose of controlling asbestos exposure, while not requiring protective equipment endangers workers' health. Furthermore, requiring all workers to exit the work area without context could disrupt the procedures and is inconsistent with necessary safety measures during removal activities.