Bridging Experimental and Community Air Pollution Research: Pulmonary Effects of Cement Dust, Vehicular Emissions, and Coal Heating

Air pollution is the most important environmental risk factor for respiratory health globally. The most significant pollutants in the atmosphere related to respiratory morbidity and lung damage are vehicle exhaust gases, industrial dust particles, etc. Experimental studies are essential to the knowledge of direct pathological effects of various pollutants on the respiratory system in a controlled manner. This experimental study evaluated and compared the histological effects of cement dust and vehicle exhaust exposure on respiratory tissues in 30 male white outbred rats. Animals were assigned to control, cement dust, or exhaust exposure groups. Following four weeks of inhalation exposure, lung and bronchial tissues underwent histological examination using hematoxylin–eosin staining. Histological analysis showed that there were no pathological changes in the lungs of controls, bronchial texture was preserved. The results of exposure to exhaust gases were vascular congestion, thickening of interalveolar septa, pulmonary edema, bronchial spasm, desquamation of epithelium, infiltration of lymphoid cells, and focal atelectasis. Comparative analysis showed that vehicle exhaust primarily affected pulmonary microcirculation and bronchial structures, whereas cement dust mainly induced chronic inflammatory and ventilatory changes. Both exposures caused significant pathological alterations in the respiratory system. The main impact of exposure to exhaust gas was acute inflammatory and microcirculatory disorders, and exposure to cement dust was the main cause of chronic inflammatory disorders and impaired airways of lung tissue. The results obtained were found to corroborate the deleterious impact of atmospheric pollutants on respiratory function and the need for environmental protection measures in industrial and urban areas.