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All habitable rooms (i.e. rooms for living, sleeping, eating or cooking) shall be provided with natural light by means of exterior glazed openings with an area not less than 1/10 of the floor area of such rooms with a minimum of 10 square feet.
The standard set a permissible exposure limit (PEL) for beryllium and beryllium compounds at 2 Î¼g/m3 as an 8-hour time-weighted average (TWA); 5 Î¼g/m3 as an acceptable ceiling concentration; and 25 Î¼g/m3 as an acceptable maximum peak above the acceptable ceiling concentration for a maximum duration of 30 minutes in an 8-hour shift.