Abstract: An air delivery and exhalation exhaust system for a protective helmet such as an abrasive blasting helmet of the type which includes a removably attachable protective body garment is disclosed. The air delivery system may also include a respirator face mask such that the air delivery system forms a first barrier to the introduction of particulate contamination from ambient atmosphere into the helmet and respiratory system of a wearer thereof and the face mask forms a second barrier to such introduction into the respiratory system of the wearer. The air delivery and exhaust system includes an air permeable exhalation exhaust skirt which is open on upper and lower ends thereof, the upper open end of which is removably attachable to and around a lower edge portion of the interior surface of the helmet. The skirt is impermeable to airborne particulate matter such as results from abrasive blasting activities.