(a) The commission may not adopt a rule, determination, or order that:
(1) relates to air conditions existing solely within buildings and structures used for commercial and industrial plants, works, or shops if the source of the offending air contaminants is under the control of the person who owns or operates the plants, works, or shops; or
(2) affects the relations between employers and their employees relating to or arising out of an air condition from a source under the control of the person who owns or operates the plants, works, or shops.
(b) This section does not limit or restrict the authority or powers granted to the commission under Sections 382.018 and 382.021.