FIG. 1.

Effects of ozone on terminal airway histology. Tissue sections, prepared 3–72h after exposure of rats to air or ozone, were stained with H & E. Images were acquired using a VS120 Virtual Microscopy system. One representative lung section from four rats per treatment group is shown. Left panels: Original magnification, ×10. Right panels: Original magnification, ×40. ndl, necrotic debris in lumen; pve, perivascular edema; vc, vascular congestion; am, alveolar macrophage; hc, hypercellularity of bronchiolar epithelium; boxes show areas of higher magnification.