SEARCH Articles Figures Tables A Light micrograph of airways from a normal rat exposed to concentrated ambient particles a chronic bronchitic rat exposed to CAPS that died following exposure for 6 hr day for 3 days. Note the slight visible buckling of the epithelium in the normal rat exposed to CAPs. In contrast, note the severe bronchoeonstrietion in the airway of the chronic bronchitic, CAP-exposed rat and the cellular infiltrate in the airway lumen. [Publishers Imprint]