The purpose of this subdivision is to protect the health of the public by regulating smoking in enclosed workplaces and enclosed places accessible to the public, regardless of whether publicly or privately owned, and in enclosed publicly owned buildings and offices. This subdivision also regulates smoking in public housing facilities, health care facilities, public primary and secondary educational facilities, and in public conveyances operating within the state. This subdivision shall not be construed as addressing airborne contaminants including toxic, chemical, or biological substances that may be present in indoor air other than tobacco smoke.